This study presents an AI-driven Spatial Decision Support System (SDSS) aimed at transforming groundwater suitability assessments for domestic and irrigation uses in Visakhapatnam District, Andhra Pradesh, India. By e...This study presents an AI-driven Spatial Decision Support System (SDSS) aimed at transforming groundwater suitability assessments for domestic and irrigation uses in Visakhapatnam District, Andhra Pradesh, India. By employing advanced remote sensing, GIS, and machine learning techniques, groundwater quality data from 50 monitoring wells, sourced from the Central Ground Water Board (CGWB), was meticulously analysed. Key parameters, including pH, electrical conductivity, total dissolved solids, and major ion concentrations, were evaluated against World Health Organization (WHO) standards to determine domestic suitability. For irrigation, advanced metrics such as Sodium Adsorption Ratio (SAR), Kelly’s Ratio, Residual Sodium Carbonate (RSC), and percentage sodium (% Na) were utilized to assess water quality. The integration of GIS for spatial mapping and AI models for predictive analytics allows for a comprehensive visualization of groundwater quality distribution across the district. Additionally, the irrigation water quality was evaluated using the USA Salinity Laboratory diagram, providing essential insights for effective agricultural water management. This innovative SDSS framework promises to significantly enhance groundwater resource management, fostering sustainable practices for both domestic use and agriculture in the region.展开更多
Goat husbandry plays a crucial role in the agrarian economy of Aligarh district,Uttar Pradesh,offering a sustainable source of income and livelihood for marginalized communities,landless farmers,and smallholders.This ...Goat husbandry plays a crucial role in the agrarian economy of Aligarh district,Uttar Pradesh,offering a sustainable source of income and livelihood for marginalized communities,landless farmers,and smallholders.This study explores the socio-economic dimensions of goat farming in the district,analyzing its impact on income generation,employment,and rural development.The present study is based on both primary and secondary data.The primary data is obtained from 12 sampled villages,and the secondary data is obtained from Statistical Bulletins of Aligarh District.The study examines the demographic composition of goat rearers,landholding patterns,and the role of gender and caste in traditional goat rearing.The findings highlight that goat farming serves as a financial safety net,often referred to as the“poor farmer’s ATM”due to its low input costs and quick returns.The study further assesses the trends,market dynamics,and future prospects of modern scientific goat farming in the region.The results indicate that despite regional variations in herd size and market accessibility,goat husbandry remains a viable strategy for poverty alleviation and economic resilience.The study concludes by emphasizing the need for improved veterinary support,financial assistance,and market linkages to enhance the efficiency and sustainability of goat farming in the district.展开更多
The Early Paleozoic porphyry-epithermal Au system of the Songshunangou District sits in the central segment of the North Qilian orogenic belt(NQOB).The porphyry Au mineralization is centered on the quartz diorite porp...The Early Paleozoic porphyry-epithermal Au system of the Songshunangou District sits in the central segment of the North Qilian orogenic belt(NQOB).The porphyry Au mineralization is centered on the quartz diorite porphyry(QDP),which is constrained to the Late Ordovician period.However,the geochemical signatures,the origin,and the tectonic setting of the QDP are not yet known and understood and are thus in the focus here.The QDP is a high-K calc-alkaline metaluminous rocks(K_(2)O+Na_(2)O:6.90-8.13;Al_(2)O_(3)/(CaO+Na_(2)O+K_(2)O):0.69-0.90)characterized by high(^(87)Sr/^(86)Sr)_(t)values(0.7093-0.7101)and lowε_(Nd)(t)values(-2.9 to-2.7)with corresponding T_(DM2)(Nd)ages of 1408 to 1430 Ma.Zirconε_(Hf)(t)values are low(-1.51 to+2.76)with corresponding T_(DM2)(Hf)ages of 1262 to 1533 Ma.The lead isotope values are 17.695-18.476 for(^(206)Pb/^(204)Pb)_(t),15.585-15.629 for(^(207)Pb/^(204)Pb)_(t),and 37.214-37.948 for(^(208)Pb/^(204)Pb)_(t).These data indicate that the QDP formed by the mixing of mantle-derived magmas(50%-70%)with lower crustal melts.The QDP is enriched in LREEs and LILE(Rb,Th,K)and is depleted in HFSE(Nb,Ta,Ti),expressing a clear volcanic arc affinity.High La and Th contents,and Zr/Y and Hf/Yb values suggest that the QDP formed in an Andean-type continental margin arc setting related to the northward subduction of the North Qilian oceanic slab.The Early Paleozoic subduction-related intermediate-acidic intrusions in NQOB have arc magma affinity,indicating that these rocks bear a great potential to discover further fertile porphyry deposits.展开更多
Understanding the infiltration process and quantifying recharge are critical for effective water resources management,particularly in arid and semi-arid regions.However,factors influencing on recharge process under di...Understanding the infiltration process and quantifying recharge are critical for effective water resources management,particularly in arid and semi-arid regions.However,factors influencing on recharge process under different land use types in irrigation districts remain unclear.In this study,a Brilliant Blue FCF dye tracer experiment was conducted to investigate infiltration pathways under the cotton field,pear orchard,and bare land conditions in the Kongque Rive Irrigation District of Xinjiang,China.Recharge rates were estimated using the chloride mass balance method.The results show that the average preferential flow ratio was highest in the bare land(50.42%),followed by the cotton field(30.09%)and pear orchard(23.59%).Matrix flow was the dominant infiltration pathway in the pear orchard and cotton field.Irrigation method was a primary factor influencing recharge rates,with surface irrigation promoting deeper infiltration compared to drip irrigation.Under the drip irrigation mode,the recharge of cotton fields ranged from 23.47 mm/a to 59.16 mm/a.In comparison,the recharge of surface irrigation in pear orchards contributed between 154.30 mm/a and 401.65 mm/a.These findings provide valuable insights into soil water infiltration and recharge processes under typical land use conditions in the Kongque River Irrigation District,supporting improved irrigation management and sustainable water resource utilization.展开更多
The construction of“park cities”requires a systematic thinking to coordinate the networked development of park system and break through the limitation of emphasizing scale and grade and neglecting dynamic correlatio...The construction of“park cities”requires a systematic thinking to coordinate the networked development of park system and break through the limitation of emphasizing scale and grade and neglecting dynamic correlation in traditional planning.Taking Haidian District of Beijing as an example,the social network analysis method is introduced to construct the network model of park green spaces.Through indicators such as clustering coefficient,network density and node centrality,the characteristics of its spatial structure and hierarchical relationship are analyzed.It is found that the network integrity presents the characteristics of“highly local concentration and global fragmentation”,fragmented park green space network and missing spatial connection,isolated clusters and collaborative failure,as well as the spatial mismatch between population and resource supply and demand.Hierarchical issues include“structural imbalance and functional disorder”,disorder between network hierarchy and park level,misalignment of functional hierarchy leading to weakened network risk resistance capacity,and a relatively dense distribution of core nodes,etc.In response to the above problems,a multi-level spatial intervention strategy should be adopted to solve the overall problem of the network.Meanwhile,it is needed to clarify the positioning of a park itself and improve the hierarchical system,so as to construct a multi-level and multi-scale park green space network,contribute to the construction of a park city,and provide residents with more diverse activity venues.展开更多
There is a gradual increase in the proportion of renewable energy sources.Green hydrogen has the potential to become one of the major energy carriers in the future.The Russian Federation,in partnership with countries ...There is a gradual increase in the proportion of renewable energy sources.Green hydrogen has the potential to become one of the major energy carriers in the future.The Russian Federation,in partnership with countries in the Asia-Pacific region and especially China,has the potential to play a significant role in green hydrogen market.This study assessed the potential of developing green hydrogen energy based on wind power in the Far Eastern Federal District(FEFD)of the Russian Federation.Empirical wind speed data were collected from 20 meteorological stations in 4 regions(Sakhalinskaya Oblast’,Primorskiy Krai,Khabarovskiy Krai,and Amurskaya Oblast’)of the FEFD.The Weibull distribution was used to predict the potential of green hydrogen production.Five different methods(Empirical Method of Justus(EMJ),Empirical Method of Lysen(EML),Maximum Likelihood Method(MLE),Power Density Method(PDM),and Median and Quartiles Method(MQM))were used to determine the parameters(scape factor and scale factor)of the Weibull distribution.We calculated the total electricity generation potential based on the technical specifications of the three wind turbines:Senvion 6150 onshore,H165-4.0 MW,and Vestas V150-4.2 MW.The results showed that Vladivostok,Pogibi,Ilyinskiy,Yuzhno-Kuril’sk,Severo-Kuril’sk,Kholmsk,and Okha stations had the higher potential of green hydrogen production,of which Vladivostok exhibited the highest potential of green hydrogen production using the wind turbine of H165-4.0 MW,up to 2.56×10^(5) kg/a.In terms of economic analysis,the levelized cost of hydrogen(LCOH)values of lower than 4.00 USD/kg were obtained at Yuzhno-Kuril’sk,Ilyinskiy,Pogibi,and Vladivostok stations using the wind turbine of H165-4.0 MW,with the values of 3.54,3.50,3.24,and 2.55 USD/kg,respectively.This study concluded that the FEFD possesses significant potential in the production of green hydrogen and,with appropriate investment,has the potential to become a significant hub for green hydrogen trading in the Asia-Pacific region.展开更多
A field investigation was performed to study the content, speciation and mobility of vanadium, as well as microbial response in soil from a stone coal smelting district in Hunan province of China. The results showed t...A field investigation was performed to study the content, speciation and mobility of vanadium, as well as microbial response in soil from a stone coal smelting district in Hunan province of China. The results showed that the contents of soil V ranged from 168 to 1538 mg/kg, which exceeded the maximum permissible value of Canadian soil quality for V. The mean soil V content from wasteland area reached 1421 mg/kg, and those from the areas related with slag heap, ore pile and smelting center were 380, 260 and 225 mg/kg, respectively. Based on the results of the modified BCR sequential extraction procedure, V contents in the mobile fractions varied from 19.2 to 637 mg/kg accounting for 7.4%-42.3% of total V, and those of V(+5) species were between 21.9 and 534.0 mg/kg. Soil enzyme activity and microbial basal respiration were adversely affected by high level of soil V. More attention should be paid to soil V pollution and potential hazardous surrounding the stone coal smelting district.展开更多
The monthly variation,temporal-spatial distribution,transportation characteristics of vapour field at middle and lower atmosphere and their effects on drought in Beijing,Tianjin and Hebei districts were studied,which ...The monthly variation,temporal-spatial distribution,transportation characteristics of vapour field at middle and lower atmosphere and their effects on drought in Beijing,Tianjin and Hebei districts were studied,which have a guiding significance on predicting climate and arranging agricultural production in the district.展开更多
This paper with the purpose of protecting visual landscape environment in historical and cultural districts,analyzes categories and characteristics of historical and cultural districts from the perspective of visual l...This paper with the purpose of protecting visual landscape environment in historical and cultural districts,analyzes categories and characteristics of historical and cultural districts from the perspective of visual landscape,finally with the assessment basis of "landscape picture" proposes the classification of areas of 5 different levels,that is,the optimal viewing gallery,the secondary viewing gallery,the optimal viewing surface,the secondary viewing surface,and the common viewing surface,explores an approach of evaluating pollution indexes in historic and cultural districts by comprehensively evaluating "landscape pictures" in those areas of different levels.展开更多
General situation of the Yihe River in the new district of Luoyang City and its evolution history were introduced and evaluated from 4 perspectives of water,embankment,vegetation and traffic accessibility.On this basi...General situation of the Yihe River in the new district of Luoyang City and its evolution history were introduced and evaluated from 4 perspectives of water,embankment,vegetation and traffic accessibility.On this basis,orientation of waterfront landscape planning of the Yihe River in the overall urban planning of Luoyang City was proposed,and it was proposed that waterfront landscape planning in the study area should follow the principles of "ecological,cultural and regional,public,accessible and human-centered".It was to provide references for the landscape planning and design of the Yihe River in the new district of Luoyang City,and to promote its waterfront landscape construction.展开更多
By using GIS, RS and landscape ecology, LandsatTM (1993 and 2009) and ETM (2001) remote sensing images of Licheng District of Ji’nan City, Shandong Province were interpreted, and dynamic changes of landscape pattern ...By using GIS, RS and landscape ecology, LandsatTM (1993 and 2009) and ETM (2001) remote sensing images of Licheng District of Ji’nan City, Shandong Province were interpreted, and dynamic changes of landscape pattern in the district were analyzed at the levels of class and landscape. The results showed that during the 16 years the landscape pattern in the district had changed significantly. (a) From the perspective of patch category, areas of arable land, woodland and grassland decreased unceasingly, and arable land accounted for the largest reduction from 488.15 km 2 in 1993 down to 324.37 km 2 in 2009, witnessing a reduction rate of 33.56%. But the patch quantity and fragmentation increased, patch connectivity reduced. Spatial pattern of construction land expanded and its area witnessed a significant increase of 147.05%. Patch cohesion index increased and connectivity grew better. (b) From the perspective of overall landscape, patch quantity, contagion and perimeter-area fractal dimension decreased, patch shape became simple, the Shannon’s diversity index, Shannon’s evenness index and splitting index increased, landscape heterogeneity rose. With the rapid social and economic development, landscape pattern will be more and more influenced by human behaviors展开更多
As the greenway construction grows popular,the concept and type of greenway is clarified in this study,research progresses and prospects of greenway planning are summarized.Greenway planning of Shunde District is take...As the greenway construction grows popular,the concept and type of greenway is clarified in this study,research progresses and prospects of greenway planning are summarized.Greenway planning of Shunde District is taken for an example to elaborate properties,types,origination and tasks of greenway,moreover,construction background,ecological,human-centered and characteristic design principles were analyzed,especially the design of its buffer zone,corridor system,width of crawl lane,node system,identification system and service area.Greenway construction of Shunde District is to build a greenway network of multiple types and functions in 3 levels:region,city and community;a recreational landscaping system with regional greenland as the background,greennet and greenway as the framework,to promote a new "ecological,green and low-carbon" lifestyle,and create the new image of Shunde as "a livable riverfront region full of sunshine".展开更多
A section more than 300 km2 in the Northern Domen District of Zhuhai City was designed to the Ecological Agricultural Zone of Zhuhai City,on the basis of introducing connotations of ecological civilization and basic c...A section more than 300 km2 in the Northern Domen District of Zhuhai City was designed to the Ecological Agricultural Zone of Zhuhai City,on the basis of introducing connotations of ecological civilization and basic conditions of this district,it was proposed that the leap-forward development pattern from agricultural civilization to ecological civilization should be applied,and 2 realization paths were summarized as developing urban agriculture and ecotourism.Ecotourism development was taken as the focus,tourist resources in the study area introduced,and bottleneck of its ecotourism development analyzed(lack of unified planning,poor consciousness of protecting historical and cultural resources;backward infrastructure,poor attractiveness for investment;insufficient propaganda and popularity;backward product development and insufficient integration of existing scenic spots.From the perspective of bottleneck of ecotourism development,the development of eco-culture and sightseeing tourism was proposed,specifically,to build a tourism spatial layout of "one axis,two wings and four centers";establish a functional circle of eco-cultural tourism,including cultural and recreational ecosphere centering on Mount Huangyang,tidal land water system ecosphere with key nodes of Dongjiao and Xijiao Villages,modern eco-agricultural sightseeing tourist circle,intangible cultural tourist circle of the waterfront Baijiao Township.展开更多
Two schemes（scheme Ⅰ and scheme Ⅱ）for designing a district cooling system（DCS）utilizing cold energy of liquefied natural gas（LNG）are presented.In scheme Ⅰ,LNG cold energy is used to produce ice,and then ice i...Two schemes（scheme Ⅰ and scheme Ⅱ）for designing a district cooling system（DCS）utilizing cold energy of liquefied natural gas（LNG）are presented.In scheme Ⅰ,LNG cold energy is used to produce ice,and then ice is transported to the central cooling plant of the DCS.In scheme Ⅱ,return water from the DCS is directly chilled by LNG cold energy,and the chilled water is then sent back to the central plant.The heat transportation loss is the main negative impact in the DCS and is emphatically analyzed when evaluating the efficiency of each scheme.The results show that the DCS utilizing LNG cold energy is feasible and valuable.The cooling supply distance of scheme Ⅱ is limited within 13 km while scheme Ⅰ has no distance limit.When the distance is between 6 and 13 km,scheme Ⅱ is more practical and effective.Contrarily,scheme Ⅰ has a better economic performance when the distance is shorter than 6 km or longer than 13 km.展开更多
[Objective] This study aimed to investigate the effects of different land use patterns on soil ecological environment. [Method] Total three representative land use patterns （corn field, cherry tree land, wood land） ...[Objective] This study aimed to investigate the effects of different land use patterns on soil ecological environment. [Method] Total three representative land use patterns （corn field, cherry tree land, wood land） were selected from Hongta District, Yuxi City, and under these three patterns, soil microbial quantity and activity were studied. [Result] Under the three land use patterns, soil microorganisms were domi- nated by bacteria; soil microbial quantity ranked as wood land＇s〉cheery tree land＇s〉 corn field＇s; and total microbial activity, catalase activity and urease activity all ranked as cherry tree land＇s〉wood land＇s〉corn field＇s. [Conclusion] Soil microbial activity and functions are related to farmland management measures, as well as land use pattern and soil nutrients.展开更多
Mountainous area makes up 22% of global land, and rational land use in this area is important for sustainable development. Mentougou district has been positioned as an ecological conservation development zone of Beiji...Mountainous area makes up 22% of global land, and rational land use in this area is important for sustainable development. Mentougou district has been positioned as an ecological conservation development zone of Beijing and significant land use changes have taken place since 2004. With the combination of GIS and Dinamica EGO(Environment for Geoprocessing Objects) model, the quantitative structure and spatial distribution of land use in Mentougou from 2006 to 2014 are analyzed in this paper. Considering topography has influence on the action mode of driving factors, the research area is divided into two parts based on elevation, mountainous area above 300 m, plain and shallow mountainous area below 300 m. Based on cellular automata theory, the probability of land use change is calculated by Weights of Evidence method and the spatial distribution of land use is simulated by means of two complementary spatial transition functions: Expander and Patcher. Land use pattern of Menougou in 2030 for three kinds of scenarios: trend development, rapid development and ecological protection are simulated. The comparison shows that the trend development scenario is more reasonable based on social, economic and environmental considerations and other scenarios provide a reference for improving irrational land use.展开更多
Application of flower border in Senlinyicheng Residential District(or Leisure Forest City) was investigated and analyzed.The results showed that(a) there are 18 flower border species of 11 families,and 16 of them are ...Application of flower border in Senlinyicheng Residential District(or Leisure Forest City) was investigated and analyzed.The results showed that(a) there are 18 flower border species of 11 families,and 16 of them are perennial and bulbous flower species,accounting for 88.9% of the total;(b) flowering season lasts from April to the late October;(c) flower borders are colorful and dominated by large lumps of colors;(d) there are 3 major types:forest edge flower border,roadside flower border and waterfront flower border.Meanwhile,problems of flower border in the study district were summarized as poor sustainability,poor landscape effects in early spring,autumn and winter,monotonous landscapes and ineffective management.Correspondingly,countermeasures were given as enhancing the sustainability of flower border landscapes,improving landscape effects in early spring,autumn and winter,applying more species with better cold and stress resistance.展开更多
This study aimed to provide theoretical basis for an optimized land use of Xigu District in Lanzhou City,Gansu Province.With the support of GIS platform,structural characteristics of 11 land use types in Xigu District...This study aimed to provide theoretical basis for an optimized land use of Xigu District in Lanzhou City,Gansu Province.With the support of GIS platform,structural characteristics of 11 land use types in Xigu District were analyzed by utilizing fragmentation degree,shape index,fractal dimension,diversity and such landscape pattern indices.展开更多
The meteorological data of light,temperature and water during 1961-2009 were selected to analyze the trend variation of climatic resources and provide the basis for developing and utilizing local climate resources.The...The meteorological data of light,temperature and water during 1961-2009 were selected to analyze the trend variation of climatic resources and provide the basis for developing and utilizing local climate resources.The results indicated that light resource presented the decreasing tendency in Dongling District,annual radiation reduced by 528 MJ/m2,and annual sunshine duration decreased by 333 h.The heat resource presented the increasing tendency,the average annual temperature increased by 1.04 ℃,and active accumulated temperature increased by 228 ℃.The general trend of annual precipitation declined slightly,precipitation resource during every age changed slightly and would tend to be stable.展开更多
The theory of landscape integrity was applied in this study to interpret landscape characteristics of Fangcheng Historic District,and the approaches for its future design were proposed.
文摘This study presents an AI-driven Spatial Decision Support System (SDSS) aimed at transforming groundwater suitability assessments for domestic and irrigation uses in Visakhapatnam District, Andhra Pradesh, India. By employing advanced remote sensing, GIS, and machine learning techniques, groundwater quality data from 50 monitoring wells, sourced from the Central Ground Water Board (CGWB), was meticulously analysed. Key parameters, including pH, electrical conductivity, total dissolved solids, and major ion concentrations, were evaluated against World Health Organization (WHO) standards to determine domestic suitability. For irrigation, advanced metrics such as Sodium Adsorption Ratio (SAR), Kelly’s Ratio, Residual Sodium Carbonate (RSC), and percentage sodium (% Na) were utilized to assess water quality. The integration of GIS for spatial mapping and AI models for predictive analytics allows for a comprehensive visualization of groundwater quality distribution across the district. Additionally, the irrigation water quality was evaluated using the USA Salinity Laboratory diagram, providing essential insights for effective agricultural water management. This innovative SDSS framework promises to significantly enhance groundwater resource management, fostering sustainable practices for both domestic use and agriculture in the region.
基金project entitled“Impact Assessment of Potential of goat farming and its Allied Activities on Socio-Economic Development of Rural Population in Aligarh District,U.P”(F.N0.02/159/2022-23/ICSSR/RP/MJ/GEN)sanctioned to Professor Nizamuddin Khan,Department of Geography,A.M.U,Aligarh.
文摘Goat husbandry plays a crucial role in the agrarian economy of Aligarh district,Uttar Pradesh,offering a sustainable source of income and livelihood for marginalized communities,landless farmers,and smallholders.This study explores the socio-economic dimensions of goat farming in the district,analyzing its impact on income generation,employment,and rural development.The present study is based on both primary and secondary data.The primary data is obtained from 12 sampled villages,and the secondary data is obtained from Statistical Bulletins of Aligarh District.The study examines the demographic composition of goat rearers,landholding patterns,and the role of gender and caste in traditional goat rearing.The findings highlight that goat farming serves as a financial safety net,often referred to as the“poor farmer’s ATM”due to its low input costs and quick returns.The study further assesses the trends,market dynamics,and future prospects of modern scientific goat farming in the region.The results indicate that despite regional variations in herd size and market accessibility,goat husbandry remains a viable strategy for poverty alleviation and economic resilience.The study concludes by emphasizing the need for improved veterinary support,financial assistance,and market linkages to enhance the efficiency and sustainability of goat farming in the district.
基金jointly funded by the National Natural Science Foundation of China(Nos.42230813,41972084)the National Key R&D Program of China(No.2022YFC2905000)the Everest Scientific Research Program of the Chengdu University of Technology(No.2020ZF11407)。
文摘The Early Paleozoic porphyry-epithermal Au system of the Songshunangou District sits in the central segment of the North Qilian orogenic belt(NQOB).The porphyry Au mineralization is centered on the quartz diorite porphyry(QDP),which is constrained to the Late Ordovician period.However,the geochemical signatures,the origin,and the tectonic setting of the QDP are not yet known and understood and are thus in the focus here.The QDP is a high-K calc-alkaline metaluminous rocks(K_(2)O+Na_(2)O:6.90-8.13;Al_(2)O_(3)/(CaO+Na_(2)O+K_(2)O):0.69-0.90)characterized by high(^(87)Sr/^(86)Sr)_(t)values(0.7093-0.7101)and lowε_(Nd)(t)values(-2.9 to-2.7)with corresponding T_(DM2)(Nd)ages of 1408 to 1430 Ma.Zirconε_(Hf)(t)values are low(-1.51 to+2.76)with corresponding T_(DM2)(Hf)ages of 1262 to 1533 Ma.The lead isotope values are 17.695-18.476 for(^(206)Pb/^(204)Pb)_(t),15.585-15.629 for(^(207)Pb/^(204)Pb)_(t),and 37.214-37.948 for(^(208)Pb/^(204)Pb)_(t).These data indicate that the QDP formed by the mixing of mantle-derived magmas(50%-70%)with lower crustal melts.The QDP is enriched in LREEs and LILE(Rb,Th,K)and is depleted in HFSE(Nb,Ta,Ti),expressing a clear volcanic arc affinity.High La and Th contents,and Zr/Y and Hf/Yb values suggest that the QDP formed in an Andean-type continental margin arc setting related to the northward subduction of the North Qilian oceanic slab.The Early Paleozoic subduction-related intermediate-acidic intrusions in NQOB have arc magma affinity,indicating that these rocks bear a great potential to discover further fertile porphyry deposits.
基金supported by the Hydrogeological Investigation Project in Kaidu River and Kongque River Basin in Xinjiang,China(No.DD2020171)the Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shaanxi Province(No.2020006).
文摘Understanding the infiltration process and quantifying recharge are critical for effective water resources management,particularly in arid and semi-arid regions.However,factors influencing on recharge process under different land use types in irrigation districts remain unclear.In this study,a Brilliant Blue FCF dye tracer experiment was conducted to investigate infiltration pathways under the cotton field,pear orchard,and bare land conditions in the Kongque Rive Irrigation District of Xinjiang,China.Recharge rates were estimated using the chloride mass balance method.The results show that the average preferential flow ratio was highest in the bare land(50.42%),followed by the cotton field(30.09%)and pear orchard(23.59%).Matrix flow was the dominant infiltration pathway in the pear orchard and cotton field.Irrigation method was a primary factor influencing recharge rates,with surface irrigation promoting deeper infiltration compared to drip irrigation.Under the drip irrigation mode,the recharge of cotton fields ranged from 23.47 mm/a to 59.16 mm/a.In comparison,the recharge of surface irrigation in pear orchards contributed between 154.30 mm/a and 401.65 mm/a.These findings provide valuable insights into soil water infiltration and recharge processes under typical land use conditions in the Kongque River Irrigation District,supporting improved irrigation management and sustainable water resource utilization.
文摘The construction of“park cities”requires a systematic thinking to coordinate the networked development of park system and break through the limitation of emphasizing scale and grade and neglecting dynamic correlation in traditional planning.Taking Haidian District of Beijing as an example,the social network analysis method is introduced to construct the network model of park green spaces.Through indicators such as clustering coefficient,network density and node centrality,the characteristics of its spatial structure and hierarchical relationship are analyzed.It is found that the network integrity presents the characteristics of“highly local concentration and global fragmentation”,fragmented park green space network and missing spatial connection,isolated clusters and collaborative failure,as well as the spatial mismatch between population and resource supply and demand.Hierarchical issues include“structural imbalance and functional disorder”,disorder between network hierarchy and park level,misalignment of functional hierarchy leading to weakened network risk resistance capacity,and a relatively dense distribution of core nodes,etc.In response to the above problems,a multi-level spatial intervention strategy should be adopted to solve the overall problem of the network.Meanwhile,it is needed to clarify the positioning of a park itself and improve the hierarchical system,so as to construct a multi-level and multi-scale park green space network,contribute to the construction of a park city,and provide residents with more diverse activity venues.
文摘There is a gradual increase in the proportion of renewable energy sources.Green hydrogen has the potential to become one of the major energy carriers in the future.The Russian Federation,in partnership with countries in the Asia-Pacific region and especially China,has the potential to play a significant role in green hydrogen market.This study assessed the potential of developing green hydrogen energy based on wind power in the Far Eastern Federal District(FEFD)of the Russian Federation.Empirical wind speed data were collected from 20 meteorological stations in 4 regions(Sakhalinskaya Oblast’,Primorskiy Krai,Khabarovskiy Krai,and Amurskaya Oblast’)of the FEFD.The Weibull distribution was used to predict the potential of green hydrogen production.Five different methods(Empirical Method of Justus(EMJ),Empirical Method of Lysen(EML),Maximum Likelihood Method(MLE),Power Density Method(PDM),and Median and Quartiles Method(MQM))were used to determine the parameters(scape factor and scale factor)of the Weibull distribution.We calculated the total electricity generation potential based on the technical specifications of the three wind turbines:Senvion 6150 onshore,H165-4.0 MW,and Vestas V150-4.2 MW.The results showed that Vladivostok,Pogibi,Ilyinskiy,Yuzhno-Kuril’sk,Severo-Kuril’sk,Kholmsk,and Okha stations had the higher potential of green hydrogen production,of which Vladivostok exhibited the highest potential of green hydrogen production using the wind turbine of H165-4.0 MW,up to 2.56×10^(5) kg/a.In terms of economic analysis,the levelized cost of hydrogen(LCOH)values of lower than 4.00 USD/kg were obtained at Yuzhno-Kuril’sk,Ilyinskiy,Pogibi,and Vladivostok stations using the wind turbine of H165-4.0 MW,with the values of 3.54,3.50,3.24,and 2.55 USD/kg,respectively.This study concluded that the FEFD possesses significant potential in the production of green hydrogen and,with appropriate investment,has the potential to become a significant hub for green hydrogen trading in the Asia-Pacific region.
基金Project(41201492)supported by the National Natural Science Foundation of China
文摘A field investigation was performed to study the content, speciation and mobility of vanadium, as well as microbial response in soil from a stone coal smelting district in Hunan province of China. The results showed that the contents of soil V ranged from 168 to 1538 mg/kg, which exceeded the maximum permissible value of Canadian soil quality for V. The mean soil V content from wasteland area reached 1421 mg/kg, and those from the areas related with slag heap, ore pile and smelting center were 380, 260 and 225 mg/kg, respectively. Based on the results of the modified BCR sequential extraction procedure, V contents in the mobile fractions varied from 19.2 to 637 mg/kg accounting for 7.4%-42.3% of total V, and those of V(+5) species were between 21.9 and 534.0 mg/kg. Soil enzyme activity and microbial basal respiration were adversely affected by high level of soil V. More attention should be paid to soil V pollution and potential hazardous surrounding the stone coal smelting district.
基金Supported by National Natural Sciences Foundations of China(40875032 and 40875002)Talents Culture Foundations of Beijing City (20051D0200802)~~
文摘The monthly variation,temporal-spatial distribution,transportation characteristics of vapour field at middle and lower atmosphere and their effects on drought in Beijing,Tianjin and Hebei districts were studied,which have a guiding significance on predicting climate and arranging agricultural production in the district.
基金Supported by Scientific Research and Innovation Program for Post-graduates in Jiangsu Province (CX10S_045Z)~~
文摘This paper with the purpose of protecting visual landscape environment in historical and cultural districts,analyzes categories and characteristics of historical and cultural districts from the perspective of visual landscape,finally with the assessment basis of "landscape picture" proposes the classification of areas of 5 different levels,that is,the optimal viewing gallery,the secondary viewing gallery,the optimal viewing surface,the secondary viewing surface,and the common viewing surface,explores an approach of evaluating pollution indexes in historic and cultural districts by comprehensively evaluating "landscape pictures" in those areas of different levels.
文摘General situation of the Yihe River in the new district of Luoyang City and its evolution history were introduced and evaluated from 4 perspectives of water,embankment,vegetation and traffic accessibility.On this basis,orientation of waterfront landscape planning of the Yihe River in the overall urban planning of Luoyang City was proposed,and it was proposed that waterfront landscape planning in the study area should follow the principles of "ecological,cultural and regional,public,accessible and human-centered".It was to provide references for the landscape planning and design of the Yihe River in the new district of Luoyang City,and to promote its waterfront landscape construction.
文摘By using GIS, RS and landscape ecology, LandsatTM (1993 and 2009) and ETM (2001) remote sensing images of Licheng District of Ji’nan City, Shandong Province were interpreted, and dynamic changes of landscape pattern in the district were analyzed at the levels of class and landscape. The results showed that during the 16 years the landscape pattern in the district had changed significantly. (a) From the perspective of patch category, areas of arable land, woodland and grassland decreased unceasingly, and arable land accounted for the largest reduction from 488.15 km 2 in 1993 down to 324.37 km 2 in 2009, witnessing a reduction rate of 33.56%. But the patch quantity and fragmentation increased, patch connectivity reduced. Spatial pattern of construction land expanded and its area witnessed a significant increase of 147.05%. Patch cohesion index increased and connectivity grew better. (b) From the perspective of overall landscape, patch quantity, contagion and perimeter-area fractal dimension decreased, patch shape became simple, the Shannon’s diversity index, Shannon’s evenness index and splitting index increased, landscape heterogeneity rose. With the rapid social and economic development, landscape pattern will be more and more influenced by human behaviors
文摘As the greenway construction grows popular,the concept and type of greenway is clarified in this study,research progresses and prospects of greenway planning are summarized.Greenway planning of Shunde District is taken for an example to elaborate properties,types,origination and tasks of greenway,moreover,construction background,ecological,human-centered and characteristic design principles were analyzed,especially the design of its buffer zone,corridor system,width of crawl lane,node system,identification system and service area.Greenway construction of Shunde District is to build a greenway network of multiple types and functions in 3 levels:region,city and community;a recreational landscaping system with regional greenland as the background,greennet and greenway as the framework,to promote a new "ecological,green and low-carbon" lifestyle,and create the new image of Shunde as "a livable riverfront region full of sunshine".
基金Supported by Zhuhai Municipal Program of Social Science Planning (201024)~~
文摘A section more than 300 km2 in the Northern Domen District of Zhuhai City was designed to the Ecological Agricultural Zone of Zhuhai City,on the basis of introducing connotations of ecological civilization and basic conditions of this district,it was proposed that the leap-forward development pattern from agricultural civilization to ecological civilization should be applied,and 2 realization paths were summarized as developing urban agriculture and ecotourism.Ecotourism development was taken as the focus,tourist resources in the study area introduced,and bottleneck of its ecotourism development analyzed(lack of unified planning,poor consciousness of protecting historical and cultural resources;backward infrastructure,poor attractiveness for investment;insufficient propaganda and popularity;backward product development and insufficient integration of existing scenic spots.From the perspective of bottleneck of ecotourism development,the development of eco-culture and sightseeing tourism was proposed,specifically,to build a tourism spatial layout of "one axis,two wings and four centers";establish a functional circle of eco-cultural tourism,including cultural and recreational ecosphere centering on Mount Huangyang,tidal land water system ecosphere with key nodes of Dongjiao and Xijiao Villages,modern eco-agricultural sightseeing tourist circle,intangible cultural tourist circle of the waterfront Baijiao Township.
文摘Two schemes（scheme Ⅰ and scheme Ⅱ）for designing a district cooling system（DCS）utilizing cold energy of liquefied natural gas（LNG）are presented.In scheme Ⅰ,LNG cold energy is used to produce ice,and then ice is transported to the central cooling plant of the DCS.In scheme Ⅱ,return water from the DCS is directly chilled by LNG cold energy,and the chilled water is then sent back to the central plant.The heat transportation loss is the main negative impact in the DCS and is emphatically analyzed when evaluating the efficiency of each scheme.The results show that the DCS utilizing LNG cold energy is feasible and valuable.The cooling supply distance of scheme Ⅱ is limited within 13 km while scheme Ⅰ has no distance limit.When the distance is between 6 and 13 km,scheme Ⅱ is more practical and effective.Contrarily,scheme Ⅰ has a better economic performance when the distance is shorter than 6 km or longer than 13 km.
文摘[Objective] This study aimed to investigate the effects of different land use patterns on soil ecological environment. [Method] Total three representative land use patterns （corn field, cherry tree land, wood land） were selected from Hongta District, Yuxi City, and under these three patterns, soil microbial quantity and activity were studied. [Result] Under the three land use patterns, soil microorganisms were domi- nated by bacteria; soil microbial quantity ranked as wood land＇s〉cheery tree land＇s〉 corn field＇s; and total microbial activity, catalase activity and urease activity all ranked as cherry tree land＇s〉wood land＇s〉corn field＇s. [Conclusion] Soil microbial activity and functions are related to farmland management measures, as well as land use pattern and soil nutrients.
基金supported by the National Natural Science Foundation of China under(Grant No.41877533)Beijing Social Science Foundation(Grant No.18GLB014)
文摘Mountainous area makes up 22% of global land, and rational land use in this area is important for sustainable development. Mentougou district has been positioned as an ecological conservation development zone of Beijing and significant land use changes have taken place since 2004. With the combination of GIS and Dinamica EGO(Environment for Geoprocessing Objects) model, the quantitative structure and spatial distribution of land use in Mentougou from 2006 to 2014 are analyzed in this paper. Considering topography has influence on the action mode of driving factors, the research area is divided into two parts based on elevation, mountainous area above 300 m, plain and shallow mountainous area below 300 m. Based on cellular automata theory, the probability of land use change is calculated by Weights of Evidence method and the spatial distribution of land use is simulated by means of two complementary spatial transition functions: Expander and Patcher. Land use pattern of Menougou in 2030 for three kinds of scenarios: trend development, rapid development and ecological protection are simulated. The comparison shows that the trend development scenario is more reasonable based on social, economic and environmental considerations and other scenarios provide a reference for improving irrational land use.
基金Supported by Foundation of Qinhuangdao Bureau of Science and Technology (201101A216)Research Program of Hebei Provincial Department of Science and Technology (11276742)~~
文摘Application of flower border in Senlinyicheng Residential District(or Leisure Forest City) was investigated and analyzed.The results showed that(a) there are 18 flower border species of 11 families,and 16 of them are perennial and bulbous flower species,accounting for 88.9% of the total;(b) flowering season lasts from April to the late October;(c) flower borders are colorful and dominated by large lumps of colors;(d) there are 3 major types:forest edge flower border,roadside flower border and waterfront flower border.Meanwhile,problems of flower border in the study district were summarized as poor sustainability,poor landscape effects in early spring,autumn and winter,monotonous landscapes and ineffective management.Correspondingly,countermeasures were given as enhancing the sustainability of flower border landscapes,improving landscape effects in early spring,autumn and winter,applying more species with better cold and stress resistance.
文摘This study aimed to provide theoretical basis for an optimized land use of Xigu District in Lanzhou City,Gansu Province.With the support of GIS platform,structural characteristics of 11 land use types in Xigu District were analyzed by utilizing fragmentation degree,shape index,fractal dimension,diversity and such landscape pattern indices.
文摘The meteorological data of light,temperature and water during 1961-2009 were selected to analyze the trend variation of climatic resources and provide the basis for developing and utilizing local climate resources.The results indicated that light resource presented the decreasing tendency in Dongling District,annual radiation reduced by 528 MJ/m2,and annual sunshine duration decreased by 333 h.The heat resource presented the increasing tendency,the average annual temperature increased by 1.04 ℃,and active accumulated temperature increased by 228 ℃.The general trend of annual precipitation declined slightly,precipitation resource during every age changed slightly and would tend to be stable.
文摘The theory of landscape integrity was applied in this study to interpret landscape characteristics of Fangcheng Historic District,and the approaches for its future design were proposed.
