The scientific assessment of ecosystem ser-vice value(ESV)plays a critical role in regional ecologi-cal protection and management,rational land use planning,and the establishment of ecological security barriers.The ec...The scientific assessment of ecosystem ser-vice value(ESV)plays a critical role in regional ecologi-cal protection and management,rational land use planning,and the establishment of ecological security barriers.The ecosystem service value of the Northeast Forest Belt from 2005 to 2020 was assessed,focusing on spatial–temporal changes and the driving forces behind these dynamics.Using multi-source data,the equivalent factor method,and geo-graphic detectors,we analyzed natural and socio-economic factors affecting the region.which was crucial for effective ecological conservation and land-use planning.Enhanced the effectiveness of policy formulation and land use plan-ning.The results show that the ESV of the Northeast Forest Belt exhibits an overall increasing trend from 2005 to 2020,with forests and wetlands contributing the most.However,there are significant differences between forest belts.Driven by natural and socio-economic factors,the ESV of forest belts in Heilongjiang and Jilin provinces showed significant growth.In contrast,the ESV of Forest Belts in Liaoning and Inner Mongolia of China remains relatively stable,but the spatial differentiation within these regions is characterized by significant clustering of high-value and low-value areas.Furthermore,climate regulation and hydrological regulation services were identified as the most important ecological functions in the Northeast Forest Belt,contributing greatly to regional ecological stability and human well-being.The ESV in the Northeast Forest Belt is improved during the study period,but the stability of the ecosystem is still chal-lenged by the dual impacts of natural and socio-economic factors.To further optimize regional land use planning and ecological protection policies,it is recommended to prior-itize the conservation of high-ESV areas,enhance ecological restoration efforts for wetlands and forests,and reasonably control the spatial layout of urban expansion and agricul-tural development.Additionally,this study highlights the importance of tailored ecological compensation policies and strategic land-use planning to balance environmental protec-tion and economic growth.展开更多
Conversion of dryland to paddy fields(CDPF)is an effective way to transition from rain-fed to irrigated agricul ture,helping to mitigate the effects of climate change on agriculture and increase yields to meet growing...Conversion of dryland to paddy fields(CDPF)is an effective way to transition from rain-fed to irrigated agricul ture,helping to mitigate the effects of climate change on agriculture and increase yields to meet growing food demand.However,the suitability of CDPF is spatio-temporally dynamic but has often been neglected in previous studies.To fill this knowledge gap,this research developed a novel method for quantifying the suitability of CDPF,based on the MaxEnt model for application in Northeast China.We explored the spatiotemporal characteristics of the suitability of CDPF under the baseline scenario(2010-2020),and future projections(2030-2090)coupled with climate change and socioeconomic development scenarios(SSP126,SSP245,and SSP585),and revealed the driving factors behind it.Based on this,we identified potential priority areas for future CDPF implementation.The results show that the suitability of CDPF projects implemented in the past ten years is relatively high.Com pared with the baseline scenario,the suitability of CDPF under the future scenarios will decline overall,with the lightest decrease in the RCP585 and the most severe decrease in the RCP245.The key drivers affecting the suitability of CDPF are elevation,slope,population count,total nitrogen,soil organic carbon content,and precip itation seasonality.The potential priority areas for the future CDPF range from 6,284.61 km^(2)to 37,006.02 km^(2).These findings demonstrate the challenges of CDPF in adapting to climate change and food security,and provide insights for food-producing regions around the world facing climate crises.展开更多
0 INTRODUCTION Subduction of oceanic plate is vital for carbon redistribution and recycling between Earth's surface and mantle,which plays a critical role in shaping carbon budgets and terrestrial habitability thr...0 INTRODUCTION Subduction of oceanic plate is vital for carbon redistribution and recycling between Earth's surface and mantle,which plays a critical role in shaping carbon budgets and terrestrial habitability through geological time(e.g.,Plank and Manning,2019;Sverjensky et al.,2014;Dasgupta and Hirschmann,2010).The long-term subduction of Pacific/Paleo-Pacific Plate from Late Mesozoic to Cenozoic beneath Northeast China makes this area an ideal candidate for exploring ancient carbon recycling and its impact on Earth's surface environment.展开更多
he report of the 20th National Congress of the Communist Party of China points out that"talents are the primary resource",and the quantity and quality of talents are important factors determining the competi...he report of the 20th National Congress of the Communist Party of China points out that"talents are the primary resource",and the quantity and quality of talents are important factors determining the competitiveness of a city.In recent years,the problem of talent outflow in Northeast China has been severe,which has to some extent affected the optimization of the industrial structure and economic and social development in Northeast China.This paper analyzes the reasons for the outflow of talents in Northeast China and,on this basis,puts forward relevant countermeasures and suggestions for urban planning in Northeast China,hoping to play a certain reference role in solving the problem of talent outflow in Northeast China.展开更多
The Northeast Plain in China ranks among the top five regions that have been significantly impacted by haze pollution.To effectively control pollution,it is crucial to accurately assess the effects of emission reducti...The Northeast Plain in China ranks among the top five regions that have been significantly impacted by haze pollution.To effectively control pollution,it is crucial to accurately assess the effects of emission reduction measures.In this study,we analyzed surveillance data and found substantial decreases(ranging from 19.0%to 50.1%)in average annual mass concentrations of key pollutants(such as CO,SO_(2),NO_(2),and PM_(2.5))in the Northeast Plain from 2016 to 2020.To precisely determine the contributions of meteorological conditions and emission reductions to the improvement of air quality in the Northeast Plain,we conducted three scenario simulations.By comparing source emissions in December 2016 and 2020 using the WRF-Chem model(except for SO_(2)),we observed significant reductions of 21.3%,8.8%,and 9.8%in mass concentrations of PM_(2.5),NO_(2),and CO,respectively,from 2016 to 2020.This highlights the essential role that meteorological conditions play in determining air quality in the Northeast Plain.Moreover,further reducing source emissions by 30%in December 2016 resulted in subsequent reductions of 25.3%,29.0%,4.5%,and 30.3%in mass concentrations of PM_(2.5),SO_(2),NO_(2),and CO,respectively,under the same meteorological conditions.Notably,source emission reduction was effective for PM_(2.5),SO_(2),and CO,but not for NO_(2).The improvement in air quality in the Northeast Plain from 2016 to 2020 can be attributed to the combined effects of improved meteorological conditions and reduced pollution sources.展开更多
A uniquely shaped impact structure,the Hailin impact crater,has been discovered in northeast China.The crater was formed on a granodiorite hillside and is an oval depression with asymmetric rim height and a maximum di...A uniquely shaped impact structure,the Hailin impact crater,has been discovered in northeast China.The crater was formed on a granodiorite hillside and is an oval depression with asymmetric rim height and a maximum diameter of 1360 m.The bottom of the crater is filled by Quaternary sediments with large amounts of rock fragments underneath.The discovery of quartz planar deformation features in rock clasts on the crater floor provides diagnostic evidence for the impact origin of the structure.The shape of the crater is largely due to the impact having occurred on a ridge terrain.The impact event probably occurred in the late Cenozoic Era.The Hailin impact crater is the fourth confirmed Chinese impact crater.展开更多
China’s endeavors to mitigate recurrent crop residue burning(CRB)and improve air quality have yielded positive results owing to recent pollution prevention policies.Nonetheless,persistent challenges remain,particular...China’s endeavors to mitigate recurrent crop residue burning(CRB)and improve air quality have yielded positive results owing to recent pollution prevention policies.Nonetheless,persistent challenges remain,particularly in the Northeast China(NEC),where low temperature complicates crop residue management.Here,we examined the effects of cropping pattern adjustment on variations of CRB patterns in NEC during 2001-2021,utilizing the Moderate-resolution Imaging Spectroradiometer(MODIS)burned area dataset,the Visible Infrared Imaging Radiometer Suite(VIIRS)active fire dataset,and the high-accuracy crop planting area maps.Our results revealed an overall upward trend of 805.96 km^(2)/yr in NEC CRB from 2001 to 2021.The corn CRB area accounted for more than 50%of the total CRB area in each CRB-intensive year(2013-2021),and the increasing corn CRB generally aligns with the growing corn cultivation fields.A seasonal shift in CRB was found around 2017,with intensive CRB activities transitioning from both autumn and spring to primarily spring,particularly in the Songnen Plain and Sanjiang Plain.The changing trend of PM2.5 concentration aligned spatially with the shift.Moreover,the CRBs in spring of 2020 and 2021 were more severe than the major burning seasons in previous years,likely due to the disruptions during COVID-19 lockdowns.In certain years,the explanatory power of spring CRB on PM2.5 concentration was comparable to that of other natural factors,such as precipitation.This study underscores the critical need for sustained and region-specific strategies to tackle the challenges posed by CRBs.展开更多
Studying the spatiotemporal distribution characteristics and coupling coordination relationship of urban and rural resilience is of substantial theoretical and practical significance to improving the ability of urban ...Studying the spatiotemporal distribution characteristics and coupling coordination relationship of urban and rural resilience is of substantial theoretical and practical significance to improving the ability of urban and rural areas to resist risk and for promoting their coordinated development.This study establishes a comprehensive evaluation index system of urban and rural resilience that encom-passes industrial,social,and ecological subsystems as well as stability,sensitivity,and adaptability.For each of the prefecture-level city in Northeast China,we evaluated its urban and rural resilience and determined the coupling coordination level between them using data spanning 2010,2015,and 2020.The resilience levels of both urban and rural areas in Northeast China are continuously improving.The high-value area of urban resilience is mainly located in the central cities of Northeast China,and prominent in urban agglomeration areas,while rural resilience is predominantly high in the north and low in the south.The high-value area of the coupling coordination degree is mainly distributed in the arc-shaped zone extending from south to north in the eastern part of Northeast China,with the level of coupling coordination increased overall.Non-parametric testing revealed significant differences in urban industrial stability,urban in-dustrial adaptability,rural industrial stability,rural social adaptability,and rural ecological stability among types of cities differing in their coupling coordination development.Our findings provide a reference for enhancing urban and rural resilience and their coordin-ated development path in Northeast China.展开更多
The exploration of the coupling and coordination between urban innovation capability(IC)and industrial transformation(IF)serves as a novel perspective for interpreting the increasingly severe phenomenon of population ...The exploration of the coupling and coordination between urban innovation capability(IC)and industrial transformation(IF)serves as a novel perspective for interpreting the increasingly severe phenomenon of population shrinkage during the industrialization process.This study investigated the evolutionary characteristics of IC and IF in shrinking and growing cities in Northeast China from 2010 to 2020.It uses entropy weighted model,coupling coordination degree,the Dagum Gini coefficient,and geographic detectors to analyze the coordinated development of IC and IF in the context of population shrinkage.The study analyzed the spatiotemporal patterns and driving mechanisms for their coordinated development.The results show that:1)both urban IC and IF exhibited an overall positive trend during the study period.Shrinking cities depend more on IF to address the challenges of population shrinkage,while growing cities mainly rely on innovation-driven development.2)The coupling gap between IC and IF in shrinking and growing cities has widened over time,with the coordination level of shrinking cities steadily decreasing.Cities with serious disorder are concentrated in northern Heilongjiang Province,while most cities in Jilin Province experience moderate disorder.Liaoning Province,however,shows generally good coupling coordination.3)Human capital is the key factor driving coupling coordination in both types of cities.Shrinking cities rely on economic and financial development,with the‘repair-type’logic that emphasizes short-term economic growth and resource compensation.In contrast,the coupling of growing cities relies on basic support capabilities,with the‘optimization-type’logic focused on enhancing endogenous resilience and systemic coordination.Exploring the coordination between urban innovation capabilities and industrial transformation can provide a new perspective for research on population shrinkage,which holds certain theoretical and practical significance for implementing the new round of revitalization strategy in Northeast China.展开更多
Climate change is significantly altering viticultural practices worldwide,with profound implications for the accumulation of polyphenolic compounds that determine wine’s sensory and health properties.This review summ...Climate change is significantly altering viticultural practices worldwide,with profound implications for the accumulation of polyphenolic compounds that determine wine’s sensory and health properties.This review summarizes the effects of climate change,particularly rising temperatures,shifting precipitation patterns,and altered light conditions-on polyphenol synthesis in Vitis amurensis(V.amurensis)grapes from Northeast China,the country’s highest-latitude wine region.Key findings reveal that:(1)Temperature increases accelerate phenological stages but differentially impact polyphenols,suppressing anthocyanins and flavonols while promoting tannins;(2)Precipitation variability induces water stress that can enhance anthocyanin content under moderate drought but reduce quality during extreme events;(3)Declining sunshine duration may limit polyphenol production,though certain cultivars(e.g.,Beibinghong)exhibit adaptability to low light conditions.The region’s unique climatic trends-stronger winter warming and reduced summer precipitation-paradoxically offer potential benefits by extending the growing season while minimizing heat stress during critical ripening periods.It is highlighted how V.amurensis,with its cold hardiness and naturally high polyphenol content(notably anthocyanins and resveratrol),could become increasingly valuable under climate change.However,strategic adaptation through cultivar selection,vineyard management,and stress-responsive breeding will be critical to maintain wine quality.This synthesis provides a framework for understanding climate-polyphenol dynamics in cool-climate viticulture and outlines research priorities to safeguard the future of Northeast China’s distinctive wine industry.展开更多
The Tongshan porphyry Cu deposit is well known as one of the most economically significant porphyry deposits in northeast China.Recently,Tongshan has become the largest porphyry Cu deposit in northeast China with the ...The Tongshan porphyry Cu deposit is well known as one of the most economically significant porphyry deposits in northeast China.Recently,Tongshan has become the largest porphyry Cu deposit in northeast China with the successful exploration of the concealed ore zone V.Ore zone V has the largest Cu tonnage(562 Mt@0.50% Cu)and extends into the eastern segment at Tongshan.Compared with ore zones I-III,which are hosted within granitic rocks in the western segment,the ore zone V mainly occurs in Duobaoshan volcanic rocks and the roof pendants of newly discovered intrusions.Here,we conducted a study of the understudied eastern ore zone and found that copper mineralization is associated with the newly discovered suites in the eastern segment at Tongshan.Two periods of ore-bearing quartz veins with different widths have been recognized,including quartz-chalcopyrite-pyrite veinlets(0.1-0.2 cm)and quartz-chalcopyrite-polymetallic sulfide wide veins(>0.5 cm).The latter veins can be divided into four stages(I-IV)of mineralization and alteration,which are closely related to the newly discovered granodiorite and dacite porphyry.Our new zircon U-Pb ages show that the granodiorite and dacite porphyry were developed between 228-223 Ma,suggesting that the overprinting porphyry copper mineralization occurred in the Triassic.The Triassic suites have adakite-like character with high Sr/Y,and show no or minimal negative Eu anomalies,indicating early dominant amphibole with limited plagioclase fractionation.For the Triassic intrusions,the high zircon Eu/Eu*(0.67-0.89),Δ_(FMQ)(1.04±0.53;whereΔ_(FMQ)is the log fO_(2)difference between the sample value and the fayalite-magnetite-quartz mineral buffer),hygrometer values(∼7.19 wt.% H_(2)O)and high whole-rock Fe_(2)O_(3)/FeO,Sr/Y,V/Sc and 10,000×(Eu/Eu*)/Y ratios together indicate the Triassic magmas were oxidized and hydrous.These contents and ratios of the Triassic suites are significantly higher than those of the Ordovician suites(Δ_(FMQ)=0.74±0.26,∼5.90 wt.%H_(2)O),suggesting that the newly discovered Triassic magmas are more oxidized and hydrous,with high potential for porphyry copper mineralization.Based on the investigation of mineralization and the above results,we proposed that multiple superimposed mineralizations can help form a large-scale deposit and the southeastern segment is a favorable exploration area at Tongshan.展开更多
The Northeast China cold vortex(NCCV)is the most important midlatitude synoptic system for weather and climate anomalies in Northeast China in the warm season.Many previous studies have focused on its synoptic and cli...The Northeast China cold vortex(NCCV)is the most important midlatitude synoptic system for weather and climate anomalies in Northeast China in the warm season.Many previous studies have focused on its synoptic and climatic variability.However,little is known about the variability of the NCCV on subseasonal timescales.In this study,we investigate the subseasonal variability of the NCCV in the warm season(May to August)and its impact based on the NCEP–NCAR reanalysis dataset and observational climate data from 1981 to 2020.Results show that the NCCV frequency exhibits a significant quasi-biweekly oscillation(QBWO,10–25 days).In 32 out of 40 years,there is at least one significant period between 10 and 25 days.Our result provides the first direct evidence for a significant QBWO signal in the NCCV frequency.The QBWO circulation on NCCV days features a cold low-pressure anomaly surrounded by warm high-pressure anomalies from northwest to southeast in a clockwise direction,which is related to an upstream wave train propagating southeastward from the Ural Mountains into Northeast China and a downstream blocking high to the northeast.The NCCV QBWO causes more rainfall,with a quadrature phase shift as rainfall leading the NCCV for approximately three days,and synchronized reduced surface air temperature in Northeast China.展开更多
Global warming has led to a gradual extension of the navigable window for the Arctic Route,providing a realistic possibility for the normalized commercial operation of the Northeast Passage(NEP).Based on the changes i...Global warming has led to a gradual extension of the navigable window for the Arctic Route,providing a realistic possibility for the normalized commercial operation of the Northeast Passage(NEP).Based on the changes in the navigable window of the NEP,Russia’s proposed nuclear-powered icebreaker construction scheme,and China’s potential development of a moderately sized ice-class fleet,this study establishes three scenarios for the commercial operation of the NEP.These scenarios include:(a)normalized summer operational scenario(from July to October each year),(b)normalized summer-autumn operational scenario(from June to January of the following year),and(c)normalized year-round operational scenario(12 months per year).The cargo transportation potential of the NEP under three normalized operational scenarios was predicted based on the grey prediction model.On this basis,construction scale plans for China’s ice-class fleet to meet cargo transportation demands under the three normalized operational scenarios were designed.The economic benefits of different plans were evaluated using a profit-maximization linear programming model.The research results show the following:(1)The cargo transportation potential of the NEP demonstrates a rapid growth trend in the future,with annual throughput under year-round normalized operations expected to exceed 100 million tonnes and reach 297 million tonnes.(2)Under different normalized operational scenarios,the fleet scale and vessel type composition vary.Under the normalized summer operational scenario,the optimal scale for China’s ice-class fleet is 20 vessels,consisting solely of ships classed as PC7 by the International Association of Classification Societies(IACS).Under the normalized summer-autumn operational scenario,the optimal fleet scale is 31 vessels,including 30 IACS PC7 ships and 1 IACS PC3 ship.Under the normalized year-round operational scenario,the optimal fleet scale is 45 vessels,composed of 30 IACS PC7 ships,8 IACS PC3 ships,and 7 IACS PC2 ships.(3)Among the three normalized operational scenarios,the normalized year-round operational scenario yields the best economic benefits for the fleet scale,while the normalized summer operational scenario yields the lowest economic benefits.展开更多
Marine heatwaves(MHWs)are extreme ocean events characterized by anomalously warm upper-ocean temperatures,posing significant threats to marine ecosystems.While various factors driving MHWs have been extensively studie...Marine heatwaves(MHWs)are extreme ocean events characterized by anomalously warm upper-ocean temperatures,posing significant threats to marine ecosystems.While various factors driving MHWs have been extensively studied,the role of ocean salinity remains poorly understood.This study investigates the influence of salinity on the major 2013-2014 MHW event in the Northeast Pacific using reanalysis data and climate model outputs.Our results show that salinity variabilities are crucial for the development of the MHW event.Notably,a significant negative correlation exists between sea surface temperature anomalies(SSTAs)and sea surface salinity anomalies(SSSAs)during the MHW,with the SSSAs emerging simultaneously with SSTAs in the same area.Negative salinity anomalies(SAs)result in a shallower mixed layer,which suppresses vertical mixing and thus sustains the upper-ocean warming.Moreover,salinity has a greater impact on mixed layer depth anomalies than temperature.Model sensitivity experiments further demonstrate that negative SAs during MHWs amplify positive SSTAs by enhancing upper-ocean stratification,intensifying the MHW.Additionally,our analysis indicates that the SAs are predominantly driven by local freshwater flux anomalies,which are mainly induced by positive precipitation anomalies during the MHW event.展开更多
The evolution mechanism of railway transportation network nodes driven by sea-rail intermodal transport(SRIT),a globally prevalent logistics method,has not been thoroughly investigated.From the perspective of SRIT,thi...The evolution mechanism of railway transportation network nodes driven by sea-rail intermodal transport(SRIT),a globally prevalent logistics method,has not been thoroughly investigated.From the perspective of SRIT,this study constructed a framework for understanding the evolution of railway container transport network nodes using Northeast China from 2013 to 2020 as a case study.It leverages proprietary data from 95306 Railway Freight E-commerce Platform.By employing the hybrid EWM-GA-TOPSIS model,complex network analysis,modified gravity model,and correlation and regression analyses,this study delves into the spatiotemporal patterns and dynamic transformations of railway container freight stations(RCFS).Finally,the long-term relationship between the RCFS and SRIT is explored.The results indicate that the spatial and temporal analysis of the RCFS in Northeast China from 2013 to 2020 revealed a clear polarisation trend,with the top-ranked stations mainly concentrated near ports and important transportation hubs.Additionally,the RCFS exhibited an expansionary trend;however,its development was uneven,and there was a significant increase in the number of new stations compared to abandoned stations,indicating an overall positive growth tendency.Moreover,the intensity of the SRIT at the RCFS in Northeast China notably increased.A significant positive linear relationship exists between SRIT and the freight capacity of all stations.A relatively pronounced correlation was observed for high-intensity stations,whereas a relatively weak correlation was observed for low-intensity stations.This study not only provides an effective framework for future research on RCFS within the context of SRIT but also serves as a scientific reference for promoting the implementation of the national strategy for multimodal transportation.展开更多
This study uses prefecture-level city statistical data from China from 2000-2022 to measure the supply and demand of livestock manure nitrogen nutrients and calculates farmland livestock carrying capacity using the ni...This study uses prefecture-level city statistical data from China from 2000-2022 to measure the supply and demand of livestock manure nitrogen nutrients and calculates farmland livestock carrying capacity using the nitrogen nutrient balance method.We investigate nitrogen supply and demand and livestock carrying capacity in northeast China by comparing emissions from 2000-2022 over the past several decades.The poultry and livestock industry in northeast China has changed significantly over the past two decades:pigs are now the most bred animal and poultry production has increased dramatically.Regional livestock nitrogen emissions are influenced primarily by the size of the local livestock industry chain.Due to regional differences,each region has unique breeding structures.We also predict the anticipated situation in 2050 using the business-as usual scenario.High-risk livestock carrying capacity areas will be concentrated in the northeast and southeast regions,with significantly increased risk indices,compared with those of 2022,particularly in Shenyang,Fushun,and Tieling.Therefore,promoting farming and breeding,improving livestock manure utilization,and returning manure to nearby farmlands are crucial for meeting agricultural green development goals.展开更多
In this study,we constructed an integrated framework of a farming–breeding–bioenergy system to estimate the greenhouse gas(GHG)emission inventories of various farming and breeding processes in the northeast region o...In this study,we constructed an integrated framework of a farming–breeding–bioenergy system to estimate the greenhouse gas(GHG)emission inventories of various farming and breeding processes in the northeast region of China from 2000 to 2021 based on life cycle assessment.Then,we compared the emission differences between the farming–breeding–bioenergy integrated system and the traditional farming–breeding system in different production segments.Finally,we assessed the environmental impact of the integrated system on agricultural GHG emissions.Results showed that the main sources of GHG emissions in Northeast China include enteric fermentation,fertilizer application,crop energy reduction,crop cultivation,and manure management.Emission hotspots also showed a trend of shifting from south to north and from east to west.In terms of environmental impact intensity,the largest increase in environmental impact intensity values among the farming and breeding systems was recorded in Heilongjiang Province(0.36)and Inner Mongolia(0.13),respectively.In terms of mitigation effects,the farming and breeding systems showed a considerable amount of residual straw and manure that can be fed into bioenergy systems,at 1801.47 and 394.12 Mt,respectively.The farming–breeding–bioenergy integrated system demonstrated mitigating effects on agricultural GHG emissions.展开更多
The Jizhong-Yanbian Cu-Mo-Au-Pb-Zn polymetallic metallogenic belt is a major nonferrous and precious metal resource base in Northeastern China.The genesis of ore deposits in this district has remained controversial.To...The Jizhong-Yanbian Cu-Mo-Au-Pb-Zn polymetallic metallogenic belt is a major nonferrous and precious metal resource base in Northeastern China.The genesis of ore deposits in this district has remained controversial.To constrain ore genetic models and provide information for exploration,we conducted precise Zn-Cd isotopic measurements on sphalerite and galena.Theδ^(66)Zn_(AA-ETH)values of galena and sphalerite range from−0.07‰to 0.03‰and−0.68‰to−0.12‰,respectively;and theirδ^(114/110)Cd_(NIST SRM 3108)values vary from−0.96‰to 3.83‰and−0.63‰to 0.77‰,respectively.Our study suggests that the Xiaohongshilazi Pb-Zn-(Ag)deposit should be classified as a Mississippi Valley Type(MVT)-like deposit,because both its geological,sulfide trace elemental,and S-Pb-Fe-Zn-Cd isotopic characteristics are similar to those of the typical MVT deposit,except for the differences of the wall rocks.Rayleigh fractionation during sphalerite precipitation is identified as the primary mechanism for Zn-Cd isotopic variations,which is validated by the Zn-Cd fractionation models from 100℃to 250℃.Finally,we propose an ore prospecting model based on migration pathways of ore-forming fluid and the Zn isotopic fractionation model of sphalerite under 100℃.This model indicates potential resources undiscovered at shallow/peripheral and deep zones of current mining level in both the Eastern and Western Ore Block,with parts of the potential resources having been corroborated by recent drilling.Despite the complexity of mineralization,processes,this study provides new insights into the application of Zn-Cd isotopes in understanding ore genesis and guiding mineral exploration in similar contexts.展开更多
Global warming has made the regular operation of Arctic routes possible.This study selects hub ports based on infrastructure conditions and sea ice status,and then designs two pendulum route solutions for the Northeas...Global warming has made the regular operation of Arctic routes possible.This study selects hub ports based on infrastructure conditions and sea ice status,and then designs two pendulum route solutions for the Northeast Passage according to the distance between hub ports and ice-covered areas.We employ an evaluation framework combining annual profit metrics with discounted net present value(NPV)analysis,conducting probabilistic economic assessments through Monte Carlo simulations(20,000 iterations).Key findings indicate that(1)both solutions demonstrate>90%probability of economic viability and(2)Solution I′,with hub ports closer to ice-covered areas than those in Solution II,yields 5.02%higher mean annual profit and 4.69%greater NPV.The results indicate that pendulum routes in the Northeast Passage can achieve economic benefits by enabling year-round regular operations.Moreover,shorter shipping distances between hub ports and ice-covered areas enhance economic viability.展开更多
Green innovation is an important driving force for high-quality development and an important guarantee for the revitalization of the old industrial base in Northeast China.However,research on green innovation is still...Green innovation is an important driving force for high-quality development and an important guarantee for the revitalization of the old industrial base in Northeast China.However,research on green innovation is still insufficient.Using the super-efficiency epsilon-based measure Malmquist model,kernel density estimation,and spatial econometric model,this study investigated the spatiotemporal evolution characteristics and influencing factors of green innovation efficiency(GIE)in Northeast China from 2005 to 2020.The results reveal that:1)The GIE in Northeast China has obvious phased characteristics,where 2005-2011 was a period of fluctuating decline while 2012-2020 was a period of fluctuating increase,reflecting the severe resource and environmental constraints faced by the green innovation process.2)The GIE in the Northeast China has a significant spatial dependence,which has not formed a relatively stable spatial club feature.The process for improving the GIE in the Northeast China in the future is still arduous and far off.3)The interweaving and mutual influence of nonequilibrium factors have led to the diversity and complexity of the spatiotemporal pattern evolution of GIE.Overall,the level of economic development and industrial structure has a positive effect,while foreign investment and industrial agglomeration have a negative effect.The direct effects of government regulation,resource endowment,science and technology,environmental regulation,and urbanization are not significant.The research conclusion of this article can provide important reference for the revitalization of Northeast China.展开更多
基金funded by the Central University D Project(HFW230600022)National Natural Science Foundation of China(71973021)+1 种基金National Natural Science Foundation Youth Funding Project(72003022)Heilongjiang Province University Think Tank Open Topic(ZKKF2022173).
文摘The scientific assessment of ecosystem ser-vice value(ESV)plays a critical role in regional ecologi-cal protection and management,rational land use planning,and the establishment of ecological security barriers.The ecosystem service value of the Northeast Forest Belt from 2005 to 2020 was assessed,focusing on spatial–temporal changes and the driving forces behind these dynamics.Using multi-source data,the equivalent factor method,and geo-graphic detectors,we analyzed natural and socio-economic factors affecting the region.which was crucial for effective ecological conservation and land-use planning.Enhanced the effectiveness of policy formulation and land use plan-ning.The results show that the ESV of the Northeast Forest Belt exhibits an overall increasing trend from 2005 to 2020,with forests and wetlands contributing the most.However,there are significant differences between forest belts.Driven by natural and socio-economic factors,the ESV of forest belts in Heilongjiang and Jilin provinces showed significant growth.In contrast,the ESV of Forest Belts in Liaoning and Inner Mongolia of China remains relatively stable,but the spatial differentiation within these regions is characterized by significant clustering of high-value and low-value areas.Furthermore,climate regulation and hydrological regulation services were identified as the most important ecological functions in the Northeast Forest Belt,contributing greatly to regional ecological stability and human well-being.The ESV in the Northeast Forest Belt is improved during the study period,but the stability of the ecosystem is still chal-lenged by the dual impacts of natural and socio-economic factors.To further optimize regional land use planning and ecological protection policies,it is recommended to prior-itize the conservation of high-ESV areas,enhance ecological restoration efforts for wetlands and forests,and reasonably control the spatial layout of urban expansion and agricul-tural development.Additionally,this study highlights the importance of tailored ecological compensation policies and strategic land-use planning to balance environmental protec-tion and economic growth.
基金supported by the Ministry of Education of Human-ities and Social Science project,China(Grant No.21YJA630121)the National Key Technology R&D Program of Ministry of Science and Technology of China(Grant No.2023YFD1500103)+2 种基金the Tsinghua Rural Studies PhD Scholarship(Grant No.202323)2023 Gradu-ate Innovation Fund Project of China University of Geosciences,Beijing(Grant No.ZD2023YC043)National Social Science Fund of China(Grants No.19ZDA096 and 20&ZD090)。
文摘Conversion of dryland to paddy fields(CDPF)is an effective way to transition from rain-fed to irrigated agricul ture,helping to mitigate the effects of climate change on agriculture and increase yields to meet growing food demand.However,the suitability of CDPF is spatio-temporally dynamic but has often been neglected in previous studies.To fill this knowledge gap,this research developed a novel method for quantifying the suitability of CDPF,based on the MaxEnt model for application in Northeast China.We explored the spatiotemporal characteristics of the suitability of CDPF under the baseline scenario(2010-2020),and future projections(2030-2090)coupled with climate change and socioeconomic development scenarios(SSP126,SSP245,and SSP585),and revealed the driving factors behind it.Based on this,we identified potential priority areas for future CDPF implementation.The results show that the suitability of CDPF projects implemented in the past ten years is relatively high.Com pared with the baseline scenario,the suitability of CDPF under the future scenarios will decline overall,with the lightest decrease in the RCP585 and the most severe decrease in the RCP245.The key drivers affecting the suitability of CDPF are elevation,slope,population count,total nitrogen,soil organic carbon content,and precip itation seasonality.The potential priority areas for the future CDPF range from 6,284.61 km^(2)to 37,006.02 km^(2).These findings demonstrate the challenges of CDPF in adapting to climate change and food security,and provide insights for food-producing regions around the world facing climate crises.
基金supported by the National Natural Science Foundation of China(Nos.42130310 and 41972055)。
文摘0 INTRODUCTION Subduction of oceanic plate is vital for carbon redistribution and recycling between Earth's surface and mantle,which plays a critical role in shaping carbon budgets and terrestrial habitability through geological time(e.g.,Plank and Manning,2019;Sverjensky et al.,2014;Dasgupta and Hirschmann,2010).The long-term subduction of Pacific/Paleo-Pacific Plate from Late Mesozoic to Cenozoic beneath Northeast China makes this area an ideal candidate for exploring ancient carbon recycling and its impact on Earth's surface environment.
文摘he report of the 20th National Congress of the Communist Party of China points out that"talents are the primary resource",and the quantity and quality of talents are important factors determining the competitiveness of a city.In recent years,the problem of talent outflow in Northeast China has been severe,which has to some extent affected the optimization of the industrial structure and economic and social development in Northeast China.This paper analyzes the reasons for the outflow of talents in Northeast China and,on this basis,puts forward relevant countermeasures and suggestions for urban planning in Northeast China,hoping to play a certain reference role in solving the problem of talent outflow in Northeast China.
基金supported by the National Key R&D Program of China(No.2022YFF0802501)the Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.2022416)+1 种基金the Natural Science Basic Research Program of Shaanxi(No.2022JQ-267)the State Key Laboratory of Loess and Quaternary Geology(No.SKLLQG2335).
文摘The Northeast Plain in China ranks among the top five regions that have been significantly impacted by haze pollution.To effectively control pollution,it is crucial to accurately assess the effects of emission reduction measures.In this study,we analyzed surveillance data and found substantial decreases(ranging from 19.0%to 50.1%)in average annual mass concentrations of key pollutants(such as CO,SO_(2),NO_(2),and PM_(2.5))in the Northeast Plain from 2016 to 2020.To precisely determine the contributions of meteorological conditions and emission reductions to the improvement of air quality in the Northeast Plain,we conducted three scenario simulations.By comparing source emissions in December 2016 and 2020 using the WRF-Chem model(except for SO_(2)),we observed significant reductions of 21.3%,8.8%,and 9.8%in mass concentrations of PM_(2.5),NO_(2),and CO,respectively,from 2016 to 2020.This highlights the essential role that meteorological conditions play in determining air quality in the Northeast Plain.Moreover,further reducing source emissions by 30%in December 2016 resulted in subsequent reductions of 25.3%,29.0%,4.5%,and 30.3%in mass concentrations of PM_(2.5),SO_(2),NO_(2),and CO,respectively,under the same meteorological conditions.Notably,source emission reduction was effective for PM_(2.5),SO_(2),and CO,but not for NO_(2).The improvement in air quality in the Northeast Plain from 2016 to 2020 can be attributed to the combined effects of improved meteorological conditions and reduced pollution sources.
基金financial support from the Shanghai Key Laboratory Novel Extreme Condition Materials,China(Grant No.22dz2260800)the Shanghai Science and Technology Committee,China(Grant No.22JC1410300)。
文摘A uniquely shaped impact structure,the Hailin impact crater,has been discovered in northeast China.The crater was formed on a granodiorite hillside and is an oval depression with asymmetric rim height and a maximum diameter of 1360 m.The bottom of the crater is filled by Quaternary sediments with large amounts of rock fragments underneath.The discovery of quartz planar deformation features in rock clasts on the crater floor provides diagnostic evidence for the impact origin of the structure.The shape of the crater is largely due to the impact having occurred on a ridge terrain.The impact event probably occurred in the late Cenozoic Era.The Hailin impact crater is the fourth confirmed Chinese impact crater.
基金supported by the National Key Research and Devel-opment Program of China(Grant No.2023YFD1500200)the funding project of Northeast Geological S&T Innovation Center of China Geologi-cal Survey(Grant No.QCJJ2022-9)+3 种基金the Strategic Priority Research Pro-gram of the Chinese Academy of Sciences(Grant No.XDA28060100)the Youth Interdisciplinary Team Project of the Chinese Academy of Sciences(JCTD-2021-04)the Informatization Plan of the Chinese Academy of Sciences(Grant No.CAS-WX2021PY-0109)the National Natural Science Foundation of China(Grants No.41971078,42271375,72221002,42001378).
文摘China’s endeavors to mitigate recurrent crop residue burning(CRB)and improve air quality have yielded positive results owing to recent pollution prevention policies.Nonetheless,persistent challenges remain,particularly in the Northeast China(NEC),where low temperature complicates crop residue management.Here,we examined the effects of cropping pattern adjustment on variations of CRB patterns in NEC during 2001-2021,utilizing the Moderate-resolution Imaging Spectroradiometer(MODIS)burned area dataset,the Visible Infrared Imaging Radiometer Suite(VIIRS)active fire dataset,and the high-accuracy crop planting area maps.Our results revealed an overall upward trend of 805.96 km^(2)/yr in NEC CRB from 2001 to 2021.The corn CRB area accounted for more than 50%of the total CRB area in each CRB-intensive year(2013-2021),and the increasing corn CRB generally aligns with the growing corn cultivation fields.A seasonal shift in CRB was found around 2017,with intensive CRB activities transitioning from both autumn and spring to primarily spring,particularly in the Songnen Plain and Sanjiang Plain.The changing trend of PM2.5 concentration aligned spatially with the shift.Moreover,the CRBs in spring of 2020 and 2021 were more severe than the major burning seasons in previous years,likely due to the disruptions during COVID-19 lockdowns.In certain years,the explanatory power of spring CRB on PM2.5 concentration was comparable to that of other natural factors,such as precipitation.This study underscores the critical need for sustained and region-specific strategies to tackle the challenges posed by CRBs.
基金Under the auspices of National Natural Science Foundation of China(No.42171198,42001117)Science and Technology Development Plan Project of Jilin Province(No.YDZJ202201ZYTS493)。
文摘Studying the spatiotemporal distribution characteristics and coupling coordination relationship of urban and rural resilience is of substantial theoretical and practical significance to improving the ability of urban and rural areas to resist risk and for promoting their coordinated development.This study establishes a comprehensive evaluation index system of urban and rural resilience that encom-passes industrial,social,and ecological subsystems as well as stability,sensitivity,and adaptability.For each of the prefecture-level city in Northeast China,we evaluated its urban and rural resilience and determined the coupling coordination level between them using data spanning 2010,2015,and 2020.The resilience levels of both urban and rural areas in Northeast China are continuously improving.The high-value area of urban resilience is mainly located in the central cities of Northeast China,and prominent in urban agglomeration areas,while rural resilience is predominantly high in the north and low in the south.The high-value area of the coupling coordination degree is mainly distributed in the arc-shaped zone extending from south to north in the eastern part of Northeast China,with the level of coupling coordination increased overall.Non-parametric testing revealed significant differences in urban industrial stability,urban in-dustrial adaptability,rural industrial stability,rural social adaptability,and rural ecological stability among types of cities differing in their coupling coordination development.Our findings provide a reference for enhancing urban and rural resilience and their coordin-ated development path in Northeast China.
基金Under the auspices of National Natural Science Foundation of China(No.42471227,42171198)。
文摘The exploration of the coupling and coordination between urban innovation capability(IC)and industrial transformation(IF)serves as a novel perspective for interpreting the increasingly severe phenomenon of population shrinkage during the industrialization process.This study investigated the evolutionary characteristics of IC and IF in shrinking and growing cities in Northeast China from 2010 to 2020.It uses entropy weighted model,coupling coordination degree,the Dagum Gini coefficient,and geographic detectors to analyze the coordinated development of IC and IF in the context of population shrinkage.The study analyzed the spatiotemporal patterns and driving mechanisms for their coordinated development.The results show that:1)both urban IC and IF exhibited an overall positive trend during the study period.Shrinking cities depend more on IF to address the challenges of population shrinkage,while growing cities mainly rely on innovation-driven development.2)The coupling gap between IC and IF in shrinking and growing cities has widened over time,with the coordination level of shrinking cities steadily decreasing.Cities with serious disorder are concentrated in northern Heilongjiang Province,while most cities in Jilin Province experience moderate disorder.Liaoning Province,however,shows generally good coupling coordination.3)Human capital is the key factor driving coupling coordination in both types of cities.Shrinking cities rely on economic and financial development,with the‘repair-type’logic that emphasizes short-term economic growth and resource compensation.In contrast,the coupling of growing cities relies on basic support capabilities,with the‘optimization-type’logic focused on enhancing endogenous resilience and systemic coordination.Exploring the coordination between urban innovation capabilities and industrial transformation can provide a new perspective for research on population shrinkage,which holds certain theoretical and practical significance for implementing the new round of revitalization strategy in Northeast China.
文摘Climate change is significantly altering viticultural practices worldwide,with profound implications for the accumulation of polyphenolic compounds that determine wine’s sensory and health properties.This review summarizes the effects of climate change,particularly rising temperatures,shifting precipitation patterns,and altered light conditions-on polyphenol synthesis in Vitis amurensis(V.amurensis)grapes from Northeast China,the country’s highest-latitude wine region.Key findings reveal that:(1)Temperature increases accelerate phenological stages but differentially impact polyphenols,suppressing anthocyanins and flavonols while promoting tannins;(2)Precipitation variability induces water stress that can enhance anthocyanin content under moderate drought but reduce quality during extreme events;(3)Declining sunshine duration may limit polyphenol production,though certain cultivars(e.g.,Beibinghong)exhibit adaptability to low light conditions.The region’s unique climatic trends-stronger winter warming and reduced summer precipitation-paradoxically offer potential benefits by extending the growing season while minimizing heat stress during critical ripening periods.It is highlighted how V.amurensis,with its cold hardiness and naturally high polyphenol content(notably anthocyanins and resveratrol),could become increasingly valuable under climate change.However,strategic adaptation through cultivar selection,vineyard management,and stress-responsive breeding will be critical to maintain wine quality.This synthesis provides a framework for understanding climate-polyphenol dynamics in cool-climate viticulture and outlines research priorities to safeguard the future of Northeast China’s distinctive wine industry.
基金supported by the National Natural Science Foundation of China(41925011)the National Key R&D Program of China(2022YFC2903601).
文摘The Tongshan porphyry Cu deposit is well known as one of the most economically significant porphyry deposits in northeast China.Recently,Tongshan has become the largest porphyry Cu deposit in northeast China with the successful exploration of the concealed ore zone V.Ore zone V has the largest Cu tonnage(562 Mt@0.50% Cu)and extends into the eastern segment at Tongshan.Compared with ore zones I-III,which are hosted within granitic rocks in the western segment,the ore zone V mainly occurs in Duobaoshan volcanic rocks and the roof pendants of newly discovered intrusions.Here,we conducted a study of the understudied eastern ore zone and found that copper mineralization is associated with the newly discovered suites in the eastern segment at Tongshan.Two periods of ore-bearing quartz veins with different widths have been recognized,including quartz-chalcopyrite-pyrite veinlets(0.1-0.2 cm)and quartz-chalcopyrite-polymetallic sulfide wide veins(>0.5 cm).The latter veins can be divided into four stages(I-IV)of mineralization and alteration,which are closely related to the newly discovered granodiorite and dacite porphyry.Our new zircon U-Pb ages show that the granodiorite and dacite porphyry were developed between 228-223 Ma,suggesting that the overprinting porphyry copper mineralization occurred in the Triassic.The Triassic suites have adakite-like character with high Sr/Y,and show no or minimal negative Eu anomalies,indicating early dominant amphibole with limited plagioclase fractionation.For the Triassic intrusions,the high zircon Eu/Eu*(0.67-0.89),Δ_(FMQ)(1.04±0.53;whereΔ_(FMQ)is the log fO_(2)difference between the sample value and the fayalite-magnetite-quartz mineral buffer),hygrometer values(∼7.19 wt.% H_(2)O)and high whole-rock Fe_(2)O_(3)/FeO,Sr/Y,V/Sc and 10,000×(Eu/Eu*)/Y ratios together indicate the Triassic magmas were oxidized and hydrous.These contents and ratios of the Triassic suites are significantly higher than those of the Ordovician suites(Δ_(FMQ)=0.74±0.26,∼5.90 wt.%H_(2)O),suggesting that the newly discovered Triassic magmas are more oxidized and hydrous,with high potential for porphyry copper mineralization.Based on the investigation of mineralization and the above results,we proposed that multiple superimposed mineralizations can help form a large-scale deposit and the southeastern segment is a favorable exploration area at Tongshan.
基金funded by the National Key R&D Program of China(Grant Nos.2023YFC3007700 and 2023YFC3007701)。
文摘The Northeast China cold vortex(NCCV)is the most important midlatitude synoptic system for weather and climate anomalies in Northeast China in the warm season.Many previous studies have focused on its synoptic and climatic variability.However,little is known about the variability of the NCCV on subseasonal timescales.In this study,we investigate the subseasonal variability of the NCCV in the warm season(May to August)and its impact based on the NCEP–NCAR reanalysis dataset and observational climate data from 1981 to 2020.Results show that the NCCV frequency exhibits a significant quasi-biweekly oscillation(QBWO,10–25 days).In 32 out of 40 years,there is at least one significant period between 10 and 25 days.Our result provides the first direct evidence for a significant QBWO signal in the NCCV frequency.The QBWO circulation on NCCV days features a cold low-pressure anomaly surrounded by warm high-pressure anomalies from northwest to southeast in a clockwise direction,which is related to an upstream wave train propagating southeastward from the Ural Mountains into Northeast China and a downstream blocking high to the northeast.The NCCV QBWO causes more rainfall,with a quadrature phase shift as rainfall leading the NCCV for approximately three days,and synchronized reduced surface air temperature in Northeast China.
基金Funding by Social Science Research of Ministry of Education of the People’s Republic of China“Study on issues related on the development and utilization of the Arctic Passage”(Grant no.20JHQ016)is acknowledged.
文摘Global warming has led to a gradual extension of the navigable window for the Arctic Route,providing a realistic possibility for the normalized commercial operation of the Northeast Passage(NEP).Based on the changes in the navigable window of the NEP,Russia’s proposed nuclear-powered icebreaker construction scheme,and China’s potential development of a moderately sized ice-class fleet,this study establishes three scenarios for the commercial operation of the NEP.These scenarios include:(a)normalized summer operational scenario(from July to October each year),(b)normalized summer-autumn operational scenario(from June to January of the following year),and(c)normalized year-round operational scenario(12 months per year).The cargo transportation potential of the NEP under three normalized operational scenarios was predicted based on the grey prediction model.On this basis,construction scale plans for China’s ice-class fleet to meet cargo transportation demands under the three normalized operational scenarios were designed.The economic benefits of different plans were evaluated using a profit-maximization linear programming model.The research results show the following:(1)The cargo transportation potential of the NEP demonstrates a rapid growth trend in the future,with annual throughput under year-round normalized operations expected to exceed 100 million tonnes and reach 297 million tonnes.(2)Under different normalized operational scenarios,the fleet scale and vessel type composition vary.Under the normalized summer operational scenario,the optimal scale for China’s ice-class fleet is 20 vessels,consisting solely of ships classed as PC7 by the International Association of Classification Societies(IACS).Under the normalized summer-autumn operational scenario,the optimal fleet scale is 31 vessels,including 30 IACS PC7 ships and 1 IACS PC3 ship.Under the normalized year-round operational scenario,the optimal fleet scale is 45 vessels,composed of 30 IACS PC7 ships,8 IACS PC3 ships,and 7 IACS PC2 ships.(3)Among the three normalized operational scenarios,the normalized year-round operational scenario yields the best economic benefits for the fleet scale,while the normalized summer operational scenario yields the lowest economic benefits.
基金The Laoshan Laboratory under contract Nos LSKJ202202403 and LSKJ202202402the National Natural Science Foundation of China under contract Nos 42030410 and 42406202+3 种基金the Natural Science Foundation of Jiangsu Province under contract No.BK20240718the Startup Foundation for Introducing Talent of Nanjing University of Information Science and Technologythe Jiangsu Innovation Research Group under contract No.JSSCTD202346the Jiangsu Funding Program for Excellent Postdoctoral Talent under contract No.2023ZB690.
文摘Marine heatwaves(MHWs)are extreme ocean events characterized by anomalously warm upper-ocean temperatures,posing significant threats to marine ecosystems.While various factors driving MHWs have been extensively studied,the role of ocean salinity remains poorly understood.This study investigates the influence of salinity on the major 2013-2014 MHW event in the Northeast Pacific using reanalysis data and climate model outputs.Our results show that salinity variabilities are crucial for the development of the MHW event.Notably,a significant negative correlation exists between sea surface temperature anomalies(SSTAs)and sea surface salinity anomalies(SSSAs)during the MHW,with the SSSAs emerging simultaneously with SSTAs in the same area.Negative salinity anomalies(SAs)result in a shallower mixed layer,which suppresses vertical mixing and thus sustains the upper-ocean warming.Moreover,salinity has a greater impact on mixed layer depth anomalies than temperature.Model sensitivity experiments further demonstrate that negative SAs during MHWs amplify positive SSTAs by enhancing upper-ocean stratification,intensifying the MHW.Additionally,our analysis indicates that the SAs are predominantly driven by local freshwater flux anomalies,which are mainly induced by positive precipitation anomalies during the MHW event.
基金National Natural Science Foundation of ChinaNo.72174035+5 种基金The National Key Research and Development ProjectNo.2023YFB4302200111 Project of ChinaNo.B20082The Talent Planning in DalianNo.2022RG05。
文摘The evolution mechanism of railway transportation network nodes driven by sea-rail intermodal transport(SRIT),a globally prevalent logistics method,has not been thoroughly investigated.From the perspective of SRIT,this study constructed a framework for understanding the evolution of railway container transport network nodes using Northeast China from 2013 to 2020 as a case study.It leverages proprietary data from 95306 Railway Freight E-commerce Platform.By employing the hybrid EWM-GA-TOPSIS model,complex network analysis,modified gravity model,and correlation and regression analyses,this study delves into the spatiotemporal patterns and dynamic transformations of railway container freight stations(RCFS).Finally,the long-term relationship between the RCFS and SRIT is explored.The results indicate that the spatial and temporal analysis of the RCFS in Northeast China from 2013 to 2020 revealed a clear polarisation trend,with the top-ranked stations mainly concentrated near ports and important transportation hubs.Additionally,the RCFS exhibited an expansionary trend;however,its development was uneven,and there was a significant increase in the number of new stations compared to abandoned stations,indicating an overall positive growth tendency.Moreover,the intensity of the SRIT at the RCFS in Northeast China notably increased.A significant positive linear relationship exists between SRIT and the freight capacity of all stations.A relatively pronounced correlation was observed for high-intensity stations,whereas a relatively weak correlation was observed for low-intensity stations.This study not only provides an effective framework for future research on RCFS within the context of SRIT but also serves as a scientific reference for promoting the implementation of the national strategy for multimodal transportation.
基金supported by the National Natural Science Foundation of Youth Project“Research on the Environmental-economic Synergistic Mechanism and Promotion Strategy of Farming and Breeding Circular Pattern in the Black Soil Region of Northeast China”[Grant No.72303087].
文摘This study uses prefecture-level city statistical data from China from 2000-2022 to measure the supply and demand of livestock manure nitrogen nutrients and calculates farmland livestock carrying capacity using the nitrogen nutrient balance method.We investigate nitrogen supply and demand and livestock carrying capacity in northeast China by comparing emissions from 2000-2022 over the past several decades.The poultry and livestock industry in northeast China has changed significantly over the past two decades:pigs are now the most bred animal and poultry production has increased dramatically.Regional livestock nitrogen emissions are influenced primarily by the size of the local livestock industry chain.Due to regional differences,each region has unique breeding structures.We also predict the anticipated situation in 2050 using the business-as usual scenario.High-risk livestock carrying capacity areas will be concentrated in the northeast and southeast regions,with significantly increased risk indices,compared with those of 2022,particularly in Shenyang,Fushun,and Tieling.Therefore,promoting farming and breeding,improving livestock manure utilization,and returning manure to nearby farmlands are crucial for meeting agricultural green development goals.
基金financially supported by the National Natural Science Foundation of Youth Project“Research on the Environmental Economic Synergistic Mechanism and Promotion Strategy of Planting and Breeding Circular Pattern in the Black Soil Region of Northeast China”[Grant No.72303087].
文摘In this study,we constructed an integrated framework of a farming–breeding–bioenergy system to estimate the greenhouse gas(GHG)emission inventories of various farming and breeding processes in the northeast region of China from 2000 to 2021 based on life cycle assessment.Then,we compared the emission differences between the farming–breeding–bioenergy integrated system and the traditional farming–breeding system in different production segments.Finally,we assessed the environmental impact of the integrated system on agricultural GHG emissions.Results showed that the main sources of GHG emissions in Northeast China include enteric fermentation,fertilizer application,crop energy reduction,crop cultivation,and manure management.Emission hotspots also showed a trend of shifting from south to north and from east to west.In terms of environmental impact intensity,the largest increase in environmental impact intensity values among the farming and breeding systems was recorded in Heilongjiang Province(0.36)and Inner Mongolia(0.13),respectively.In terms of mitigation effects,the farming and breeding systems showed a considerable amount of residual straw and manure that can be fed into bioenergy systems,at 1801.47 and 394.12 Mt,respectively.The farming–breeding–bioenergy integrated system demonstrated mitigating effects on agricultural GHG emissions.
基金supported by the Open Research Project from the Young Elite Scientists Sponsorship Program by BAST(No.BYESS2023411)the State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences(GPMR202407)the Enterprise Authorized Item from Jilin Sanhe Mining Development Co.LTD(3-4-2021-120).
文摘The Jizhong-Yanbian Cu-Mo-Au-Pb-Zn polymetallic metallogenic belt is a major nonferrous and precious metal resource base in Northeastern China.The genesis of ore deposits in this district has remained controversial.To constrain ore genetic models and provide information for exploration,we conducted precise Zn-Cd isotopic measurements on sphalerite and galena.Theδ^(66)Zn_(AA-ETH)values of galena and sphalerite range from−0.07‰to 0.03‰and−0.68‰to−0.12‰,respectively;and theirδ^(114/110)Cd_(NIST SRM 3108)values vary from−0.96‰to 3.83‰and−0.63‰to 0.77‰,respectively.Our study suggests that the Xiaohongshilazi Pb-Zn-(Ag)deposit should be classified as a Mississippi Valley Type(MVT)-like deposit,because both its geological,sulfide trace elemental,and S-Pb-Fe-Zn-Cd isotopic characteristics are similar to those of the typical MVT deposit,except for the differences of the wall rocks.Rayleigh fractionation during sphalerite precipitation is identified as the primary mechanism for Zn-Cd isotopic variations,which is validated by the Zn-Cd fractionation models from 100℃to 250℃.Finally,we propose an ore prospecting model based on migration pathways of ore-forming fluid and the Zn isotopic fractionation model of sphalerite under 100℃.This model indicates potential resources undiscovered at shallow/peripheral and deep zones of current mining level in both the Eastern and Western Ore Block,with parts of the potential resources having been corroborated by recent drilling.Despite the complexity of mineralization,processes,this study provides new insights into the application of Zn-Cd isotopes in understanding ore genesis and guiding mineral exploration in similar contexts.
文摘Global warming has made the regular operation of Arctic routes possible.This study selects hub ports based on infrastructure conditions and sea ice status,and then designs two pendulum route solutions for the Northeast Passage according to the distance between hub ports and ice-covered areas.We employ an evaluation framework combining annual profit metrics with discounted net present value(NPV)analysis,conducting probabilistic economic assessments through Monte Carlo simulations(20,000 iterations).Key findings indicate that(1)both solutions demonstrate>90%probability of economic viability and(2)Solution I′,with hub ports closer to ice-covered areas than those in Solution II,yields 5.02%higher mean annual profit and 4.69%greater NPV.The results indicate that pendulum routes in the Northeast Passage can achieve economic benefits by enabling year-round regular operations.Moreover,shorter shipping distances between hub ports and ice-covered areas enhance economic viability.
基金Under the auspices of the National Natural Science Foundation of China(No.42571228,42401212)National Natural Science Foundation of Shandong(No.ZR2024MD022)。
文摘Green innovation is an important driving force for high-quality development and an important guarantee for the revitalization of the old industrial base in Northeast China.However,research on green innovation is still insufficient.Using the super-efficiency epsilon-based measure Malmquist model,kernel density estimation,and spatial econometric model,this study investigated the spatiotemporal evolution characteristics and influencing factors of green innovation efficiency(GIE)in Northeast China from 2005 to 2020.The results reveal that:1)The GIE in Northeast China has obvious phased characteristics,where 2005-2011 was a period of fluctuating decline while 2012-2020 was a period of fluctuating increase,reflecting the severe resource and environmental constraints faced by the green innovation process.2)The GIE in the Northeast China has a significant spatial dependence,which has not formed a relatively stable spatial club feature.The process for improving the GIE in the Northeast China in the future is still arduous and far off.3)The interweaving and mutual influence of nonequilibrium factors have led to the diversity and complexity of the spatiotemporal pattern evolution of GIE.Overall,the level of economic development and industrial structure has a positive effect,while foreign investment and industrial agglomeration have a negative effect.The direct effects of government regulation,resource endowment,science and technology,environmental regulation,and urbanization are not significant.The research conclusion of this article can provide important reference for the revitalization of Northeast China.
