Seasonal cycles of phytoplankton blooms are crucial to marine ecosystems and highly sensitive to environmental fluctuations.Rapid climate change has a profound impact on regional environmental conditions,thereby affec...Seasonal cycles of phytoplankton blooms are crucial to marine ecosystems and highly sensitive to environmental fluctuations.Rapid climate change has a profound impact on regional environmental conditions,thereby affecting seasonal blooms at both regional and global scales.The western Antarctic Peninsula(WAP)is one of the most productive regions in the Southern Ocean and has experienced accelerated climate change in recent decades.However,the impact of climate change on bloom dynamics in this region remains uncertain due to regional variability and the complex interplay of environmental factors.Using 26 a(1998−2023)of satellite data,this study examines patterns and trends in bloom seasonal metrics on the southern WAP,and further explores the impact of large-scale climate drivers.A key finding was a clear shift in bloom timing,with earlier and longer blooms observed during 2012−2023.These shifts were associated with reduced spring sea ice extent(SIE),which correlated with warming spring sea surface air temperatures(SAT).Atmospheric teleconnections,particularly the El Niño-Southern Oscillation(ENSO)and Southern Annular Mode(SAM)in spring,were linked to changes in SAT and sea ice dynamics.This study highlights the role of climate drivers in altering bloom dynamics,potentially affecting local marine food webs,and underscores the need for further research to understand Antarctic ecosystem evolution under future climate scenarios.展开更多
Samples for this study were collected from Geologists Island and Prydz Bay in different seasons.Otolith sections were analyzed for elemental composition in the nucleus,juvenile,and edge areas.Elements including Mg,Sr,...Samples for this study were collected from Geologists Island and Prydz Bay in different seasons.Otolith sections were analyzed for elemental composition in the nucleus,juvenile,and edge areas.Elements including Mg,Sr,P,K,Fe,and Zn,normalized to calcium(CMe/CCa),were selected for analysis.To explore population structure,we studied factors influencing population dynamics during life stage,and regional distribution characteristics.For identified individual origins and explored the distribution and migration between regions and migration from hatching to adulthood provide a basis.So as to understand the distribution and migration pattern of Pagothenia borchgrevinki across various life history stages.Results indicated a consistent P.borchgrevinki population spawning across various regions of Southern Ocean,with eggs distributed at the bottom.Coastal slope topography changes and water compensation facilitated egg transportation from the bottom to under sea ice during hatching to juvenile stages.Long-distance migration was facilitated by the Antarctic Circumpolar Current and regional currents during development to adulthood.Multiple spawning grounds and ocean currents contributed to diverse distribution environments during the hatching period.Differences in individual development were important factors during the juvenile period,while ocean currents and autonomous behaviors influenced regional transportation patterns in the post development stages.Therefore,the research holds that differences in distribution environment and behavior during each period led to distinct factors influencing CMe/CCa variations.展开更多
The winter temperature variability of the Antarctic Peninsula(AP)has been proven to be influenced by sea surface temperature(SST)anomalies over the Tasman Sea.Using outputs over an extended time period from historical...The winter temperature variability of the Antarctic Peninsula(AP)has been proven to be influenced by sea surface temperature(SST)anomalies over the Tasman Sea.Using outputs over an extended time period from historical experiments,the skills of CMIP6 models in simulating the atmospheric responses to Tasman Sea SST are evaluated in this study,with an emphasis on the relationships with AP temperatures.The spatial correlation coefficient and normalized standard deviation are used as the evaluation metrics.Corresponding results suggest that the majority of CMIP6 models can capture the basic spatial distributions of Tasman Sea-related teleconnections across the Southern Hemisphere extratropical region,featuring a Pacific–South America-like pattern.However,the overestimation of atmospheric interannual variability and the underestimation of oceanic interannual variability in CMIP6 models result in a considerable amplification of the atmospheric responses to SST anomalies.The model uncertainty in depicting the relationships between Tasman Sea SSTs and AP surface temperatures,as well as the associated teleconnections,can partially be attributed to variations in grid resolutions among models.Additionally,further analysis of the Antarctic sea ice shows that the Tasman Sea SST may contribute to the interannual variability of the Antarctic dipole in CMIP6.展开更多
The harsh natural environment of Antarctica has led to a lack of research on the presence and transport mechanisms of organophosphate esters(OPEs) within its ecosystem.In this study,we analyzed levels of 11 OPEs in ai...The harsh natural environment of Antarctica has led to a lack of research on the presence and transport mechanisms of organophosphate esters(OPEs) within its ecosystem.In this study,we analyzed levels of 11 OPEs in air,soil,and vegetation samples collected during the 2018-2019 Chinese 35th Antarctic Scientific Expedition.Additionally,a level Ⅲ fugacity model was developed to simulate the movement and fate of detected OPEs in the air,soil,and vegetation of the Fildes Peninsula.Our model indicated that the primary OPEmigration pathway was from the atmosphere to the soil.OPE transportation primarily occurred through atmospheric wet deposition and rainwater dissolution.Among the 20 transport and transformation processes,atmospheric degradation was the most significant loss mechanism.The proposed model provides a method for continued investigation into the fate of OPEs in the Fildes Peninsula ecosystem.展开更多
To investigate the effect of typhoon path translation on storm surge augmentation,the storm surge during Typhoon 1909 Lekima in the East China Sea is simulated using Delft 3D.The model sets up three scenarios to analy...To investigate the effect of typhoon path translation on storm surge augmentation,the storm surge during Typhoon 1909 Lekima in the East China Sea is simulated using Delft 3D.The model sets up three scenarios to analyze the path’s effect on storm surge in the Shandong Peninsula Sea by shifting the typhoon path to the east and west.Results show that the areas of maximum storm surge in each scenario are located on both sides of the typhoon path and shift along with its movement.When the typhoon path shifts eastward,the maximum storm surge intensifies at Zhifu Island station 8 hours earlier.Conversely,a westward shift in the typhoon track leads to a maximum storm surge increase at Shidao Island station 12 hours earlier.Other scenarios exhibit minimal deviation from the original route.Typhoons penetrating deep inland can induce substantial storm surges,with the most extensive surge area situated in the western part of the Shandong Peninsula.展开更多
The lithospheric thinning and huge gold mineralization in the Jiaodong Peninsula is intensively studied,aiming to better understand the geodynamic setting of the magmatic petrogenesis and the relationship between magm...The lithospheric thinning and huge gold mineralization in the Jiaodong Peninsula is intensively studied,aiming to better understand the geodynamic setting of the magmatic petrogenesis and the relationship between magmatism and large-scale mineralization.Thus,we conducted detailed research on the Weideshan intrusions in the Jiaodong region,including fi eld investigations,geochemical,geochronological and Hf isotope analysis,to reveal the tectonic implications for the destruction of the eastern North China Craton(NCC).The Weideshan intrusions consist of quartz monzodiorite,quartz monzonite and monzogranite.The SHRIMP zircon U-Pb dating results show that the Weideshan intrusions are emplaced at 115–112 Ma,namely,in the late Early Cretaceous period.Rocks of Weideshan intrusions are high-K calc-alkaline series and metaluminous granites.The trace elements are characterized by enrichment of Rb,Ba,Sr and LREE,with unobvious Eu anomalies and depletion of Nb,Ta,Zr,Hf and Ti.The contents of Ba and Sr are(913.00–1562.00)/1199.29μg/g and(373.00–793.00)/536.71μg/g,respectively,showing the features of high Ba–Sr granites(HBS).Development of numerous dark enclaves and negativeεHf(t)values(−17.93 to−12.19)indicate that the Weideshan granites originate from the mixture of crustal-derived felsic magma from partial melting of the Paleoproterozoic crust and alkali-rich magma from the enriched mantle.The generation of the Weideshan granites was closely related to the asthenospheric upwelling during the lithosphere thinning of the NCC in the late Mesozoic.展开更多
Since its description,the taxon Ophrys sphegodes subsp.grammica has been considered endemic to Greece.The morphological and chorological data of this taxon have been overlooked because the name has been used as a syno...Since its description,the taxon Ophrys sphegodes subsp.grammica has been considered endemic to Greece.The morphological and chorological data of this taxon have been overlooked because the name has been used as a synonym for O.sphegodes subsp.taurica in most publications and online databases.Recently discovered Ophrys populations in Serbia were identified as O.sphegodes subsp.grammica.As these populations represent the northernmost point of distribution of this taxon,we provided data on the morphology,flowering season,and ecology.To determine the taxonomic status of this taxon,we performed comparative morphological analyses,comparing them to other populations of affined taxa(O.sphegodes subsp.grammica,O.sphegodes subsp.taurica,and O.sphegodes subsp.sphegodes).The analysis included 23 morphometric characters,performed on a total of 120 individuals.Examined populations of O.sphegodes subsp.grammica are closely associated with populations of O.sphegodes subsp.sphegodes,with near overlap in the values of the characteristics evaluated,indicating that this subspecies is more morphologically similar to the typical one than to O.sphegodes subsp.taurica.Although O.sphegodes subsp.grammica and O.sphegodes subsp.sphegodes are morphologically similar,the flowers of the first taxon are smaller,as evidenced by the length and width of the stigmatic cavity,as well as the length of the petals and labellum.The labellum of O.sphegodes subsp.grammica is shorter than the dorsal sepal,and this feature distinguishes it from both the typical subspecies and O.sphegodes subsp.taurica,where it is longer.The results of this study clearly show that the name O.sphegodes subsp.grammica should not be equated with O.sphegodes subsp.taurica,since it is a morphologically distinct and well-defined taxon.展开更多
Recently identified hydrothermal monazite from the Sidaogou deposit in the Liaodong Peninsula,is co-genetic with gold-bearing ore minerals and thus can serve as ideal proxy for dating the gold-mineralization event.Our...Recently identified hydrothermal monazite from the Sidaogou deposit in the Liaodong Peninsula,is co-genetic with gold-bearing ore minerals and thus can serve as ideal proxy for dating the gold-mineralization event.Our study effectively solved the dilemma of lack of any accurate age for the Sidaogou deposit.The Sidaogou deposit is hosted mainly by Paleoproterozoic metamorphic rocks of the Liaohe Group,and hydrothermal monazite therein occurs within voids or along micro-fractures in syn-ore pyrite and quartz.First in situ SIMS U-Th-Pb isotope data on this monazite from the Sidaogou deposit yielded an inverse Concordia age of 184±20 Ma,which is much younger than an^(40)Ar-^(39)Ar age of 1858.9±25.4 Ma obtained on muscovite from the host rock(Gaixian Formation),thus supporting a prominent Early Jurassic gold mineralization event in the Wulong gold field,which is distinct from previously established Early Cretaceous gold mineralization,held responsible for the nearby large Wulong gold deposit.Our new findings make it possible,together with previous studies,to formulate a model for the Early Jurassic magmatic-hydrothermal gold system in the area,for which a compressional setting during the westward subduction of the Paleo-Pacific Plate beneath the North China Craton is postulated.展开更多
The Taishang-Shuiwangzhuang gold deposit is located in the southeastern margin of Linglong gold field in the northern part of the Zhaoping Fault metallogenic belt of the Jiaodong gold province-the world’s third-large...The Taishang-Shuiwangzhuang gold deposit is located in the southeastern margin of Linglong gold field in the northern part of the Zhaoping Fault metallogenic belt of the Jiaodong gold province-the world’s third-largest gold metallogenic area.Major prospecting breakthroughs have been made at the depth of 600‒2500 m in recent years,with cumulative proven gold resources exceeding 700 t.Based on a large number of exploration data,the main characteristics of the deposit are described in detail,and the spatial coupling relationship between ore-controlling fault and main orebodies is discussed.The main orebodies occur as regular large veins,exhibiting branching and combination,expansion and contraction,and pinch-out and reoccurrence.They extend in a gentle wave pattern along their strikes and dip directions and generally have a pitch direction of NEE and a plunge direction of NEE.As the ore-controlling fault,the Zhaoping Fault has the characteristics of wave-like fluctuation,with its dip angle presenting three steps of steep-slow transition within the depth range of 2500 m.The gold mineralization enrichment area is mainly distributed in the step parts where the fault plane changes from steeply to gently.The ore-forming age,ore-forming fluid and ore-forming material sources and the genesis of the ore deposit are analyzed based on the research results of ore deposit geochemistry.The ore-forming fluids were H_(2)O-CO_(2)-NaCl-type hydrothermal solutions with a medium-low temperature and medium-low salinity.The H-O isotopic characteristics indicate that the fluids in the early ore-forming stage were possibly formed by degassing of basic magma and that meteoric water gradually entered the ore-forming fluids in the late ore-forming stage.The S and Pb isotopes indicate that the ore-forming materials mainly originate from the lower crust and contain a small quantity of mantle-derived components.The comprehensive analysis shows that the Taishang-shuiwangzhuang gold deposit was a typical“Jiaodong type”gold deposit.The strong crust-mantle interactions,large-scale magmatism,and the material exchange arising from the transformation from the ancient lower crust to the juvenile lower crust during the Early Cretaceous provided abundant fluids and material sources for mineralization.Moreover,the detachment faults formed by the rapid magmatic uplift and the extensional tectonism created favorable temperature and pressure conditions and space for fluid accumulation and gold precipitation and mineralization.展开更多
山东北部沿海平原区小麦-玉米周年两吨粮超高产技术创建是中国农业大学作物化控团队和莱州市金海种业在山东省莱州市开展的一项重要农业生产示范项目。通过精选良种、合理密植及水肥一体化等措施,以期实现小麦和玉米的高产高效种植。在2...山东北部沿海平原区小麦-玉米周年两吨粮超高产技术创建是中国农业大学作物化控团队和莱州市金海种业在山东省莱州市开展的一项重要农业生产示范项目。通过精选良种、合理密植及水肥一体化等措施,以期实现小麦和玉米的高产高效种植。在2023年该地块小麦和玉米两季的种植中,现场实测每公顷的总产量达到了31,323.90 kg(折合2088.26 kg mu-1)。其中冬小麦由农业农村部组织专家测产打破了黄淮海地区小麦的单产纪录,实际产量高达13,213.35 kg hm-2(折合880.89 kg mu-1)。种植品种烟农1212每平方米穗数为692.0,穗粒数为40.1,千粒重为52.55 g,单株产量为4.74 g,收获指数为0.56,水分利用效率为3.24 kg m-3。夏玉米中金玉2513的每平方米穗数为9.1,穗粒数为584.7,千粒重为379.31 g,单株产量为206.25 g,收获指数为0.58,水分利用效率为2.86 kg m-3,实际产量为18,110.55 kg hm-2(折合1207.37 kg mu-1)。在2024年的重复试验中,小麦-玉米的实际产量继续达到30,997.00 kg hm-2(折合2065.13 kg mu-1)。本文旨在总结高产纪录小麦-玉米复种高产田生产过程的主要管理环节和高产群体的主要指标,为山东北部沿海平原区小麦-玉米复种高产提供参考。展开更多
Leizhou Peninsula, located at southem end of mailand China, has 9 284.3 ha mangrove distributed more than 100 sites along its inlets and open coastlines. This paper presents the surveys on mangrove area in Leizhou Pen...Leizhou Peninsula, located at southem end of mailand China, has 9 284.3 ha mangrove distributed more than 100 sites along its inlets and open coastlines. This paper presents the surveys on mangrove area in Leizhou Peninsula during 2000 and 2008, especially the survey in the eight major mangrove areas in 2002. The flora recorded in mangrove systems includes 69 large algea species, 13 native true mangrove species, nine native semi-mangrove species, and another seven intoduced true mangrove species with Sonneratia apetala as the quickest growing exotic mangrove species dominatant in the mangrove plantations, and more than 100 land flora species, consisting of 17 main mangrove associations. The plant biodiversity habitats remained mainly small patches and diverse, and were becoming worse under the intensive disturbance of human acitivities and coastal pollutions, which decreased the value of mangrove coasts as the important sites for flying-by migrating birds in Leizhou Peninsula. The effective mangrove conservation measures should be implemented.展开更多
The exotic Sonneratia apetala in Leizhou Peninsula, has shown outstanding fast-growing ability in restored mangrove forests, at the middle and high tide intertidal zone, with year-round fresh water input from drainage...The exotic Sonneratia apetala in Leizhou Peninsula, has shown outstanding fast-growing ability in restored mangrove forests, at the middle and high tide intertidal zone, with year-round fresh water input from drainage. By setting plot and selecting standard tree, investigation and measurement on height growth, diameter growth, biomass, productivity, and so on, were made in a S. apetala plantation at age of six at Lanbei, Fucheng, Leizhou Peninsula in May 2001. The investigating results showed that the mean annual height growth of plantation was 2.03 m and mean annual growth of diameter at breast height (DBH) was 2.35 cm. There exists a significant correlation between the diameter at ground surface (DGS) and DBH. The average biomass of a single standard tree in dry weight was 95.647 kg/m2. A ratio of above-ground biomass to under-ground biomass was 1.60. The stand biomass of unit area was 22.955 kg/m2, singletree wood volume was 88.23 dm3, and the annual wood volume productivity (PA) of the same year was 0.407. The forest energy accumulation was 424.851 MJ/m2, with annual solar energy fixing rate of 40.68 ×10-7%. It is concluded that S. apetala species had characteristics of outstanding high biomass accumulation and could be used as coastal planting tree species in southern China.展开更多
After a field work on recently raised coastal features in South Shetland Islands, we conclude that there are three kinds of recent coastal features, i. e, fragmental coast, rock coast, and ice cliff coast. The process...After a field work on recently raised coastal features in South Shetland Islands, we conclude that there are three kinds of recent coastal features, i. e, fragmental coast, rock coast, and ice cliff coast. The processes and forms of the fragmental cost formed by wave action with floating ice are studied. Systematic study of the raised coasts enables us to distinguish two groups of the coasts by an elevation of 20m a. s. 1. The raised coasts above 20m a. s. 1. belong to older group and those below 20m a. s. 1. belong to younger group. Mean uplift rate of coast in this area is 6. 7 mm/a.展开更多
基金The National Natural Science Foundation of China under contract Nos 42325602 and 41976164the National Key Research and Development Program of China under contract No.2022YFC2807601.
文摘Seasonal cycles of phytoplankton blooms are crucial to marine ecosystems and highly sensitive to environmental fluctuations.Rapid climate change has a profound impact on regional environmental conditions,thereby affecting seasonal blooms at both regional and global scales.The western Antarctic Peninsula(WAP)is one of the most productive regions in the Southern Ocean and has experienced accelerated climate change in recent decades.However,the impact of climate change on bloom dynamics in this region remains uncertain due to regional variability and the complex interplay of environmental factors.Using 26 a(1998−2023)of satellite data,this study examines patterns and trends in bloom seasonal metrics on the southern WAP,and further explores the impact of large-scale climate drivers.A key finding was a clear shift in bloom timing,with earlier and longer blooms observed during 2012−2023.These shifts were associated with reduced spring sea ice extent(SIE),which correlated with warming spring sea surface air temperatures(SAT).Atmospheric teleconnections,particularly the El Niño-Southern Oscillation(ENSO)and Southern Annular Mode(SAM)in spring,were linked to changes in SAT and sea ice dynamics.This study highlights the role of climate drivers in altering bloom dynamics,potentially affecting local marine food webs,and underscores the need for further research to understand Antarctic ecosystem evolution under future climate scenarios.
基金supported by the Impact and Response of Antarctic Seas to Climate Change(Grant no.IRASCC 2020-2025)from Ministry of Natural Resources of the People’s Republic of China.
文摘Samples for this study were collected from Geologists Island and Prydz Bay in different seasons.Otolith sections were analyzed for elemental composition in the nucleus,juvenile,and edge areas.Elements including Mg,Sr,P,K,Fe,and Zn,normalized to calcium(CMe/CCa),were selected for analysis.To explore population structure,we studied factors influencing population dynamics during life stage,and regional distribution characteristics.For identified individual origins and explored the distribution and migration between regions and migration from hatching to adulthood provide a basis.So as to understand the distribution and migration pattern of Pagothenia borchgrevinki across various life history stages.Results indicated a consistent P.borchgrevinki population spawning across various regions of Southern Ocean,with eggs distributed at the bottom.Coastal slope topography changes and water compensation facilitated egg transportation from the bottom to under sea ice during hatching to juvenile stages.Long-distance migration was facilitated by the Antarctic Circumpolar Current and regional currents during development to adulthood.Multiple spawning grounds and ocean currents contributed to diverse distribution environments during the hatching period.Differences in individual development were important factors during the juvenile period,while ocean currents and autonomous behaviors influenced regional transportation patterns in the post development stages.Therefore,the research holds that differences in distribution environment and behavior during each period led to distinct factors influencing CMe/CCa variations.
基金jointly supported by the National Natural Science Foundation of China(Grant No.42375027)the Natural Science Foundation of Guangdong Province(Grant No.2023A1515010889)。
文摘The winter temperature variability of the Antarctic Peninsula(AP)has been proven to be influenced by sea surface temperature(SST)anomalies over the Tasman Sea.Using outputs over an extended time period from historical experiments,the skills of CMIP6 models in simulating the atmospheric responses to Tasman Sea SST are evaluated in this study,with an emphasis on the relationships with AP temperatures.The spatial correlation coefficient and normalized standard deviation are used as the evaluation metrics.Corresponding results suggest that the majority of CMIP6 models can capture the basic spatial distributions of Tasman Sea-related teleconnections across the Southern Hemisphere extratropical region,featuring a Pacific–South America-like pattern.However,the overestimation of atmospheric interannual variability and the underestimation of oceanic interannual variability in CMIP6 models result in a considerable amplification of the atmospheric responses to SST anomalies.The model uncertainty in depicting the relationships between Tasman Sea SSTs and AP surface temperatures,as well as the associated teleconnections,can partially be attributed to variations in grid resolutions among models.Additionally,further analysis of the Antarctic sea ice shows that the Tasman Sea SST may contribute to the interannual variability of the Antarctic dipole in CMIP6.
基金supported by the Joint Research Project of Hainan Province(No.ZDYF2024SHFZ085)Hainan Provincial Union Project of Sanya Yazhou Bay Science and Technology City(No.2021CXLH0009)+2 种基金the National Natural Science Foundation of China(Nos.42006195 and 42376234)the Science Technology Project of Yazhou Bay Innovation Institute of Hainan Tropical Ocean University(No.2022CXYZD002)the Scientific Research of Hainan Tropical Ocean University(No.RHDRC202201).
文摘The harsh natural environment of Antarctica has led to a lack of research on the presence and transport mechanisms of organophosphate esters(OPEs) within its ecosystem.In this study,we analyzed levels of 11 OPEs in air,soil,and vegetation samples collected during the 2018-2019 Chinese 35th Antarctic Scientific Expedition.Additionally,a level Ⅲ fugacity model was developed to simulate the movement and fate of detected OPEs in the air,soil,and vegetation of the Fildes Peninsula.Our model indicated that the primary OPEmigration pathway was from the atmosphere to the soil.OPE transportation primarily occurred through atmospheric wet deposition and rainwater dissolution.Among the 20 transport and transformation processes,atmospheric degradation was the most significant loss mechanism.The proposed model provides a method for continued investigation into the fate of OPEs in the Fildes Peninsula ecosystem.
基金supported by the Yantai Science,Technology and Innovation Development Programme(Nos.2023 JCYJ094,2023JCYJ097)the Major Research Grant from the Natural Science Foundation of China(NSFC)(No.42330406)。
文摘To investigate the effect of typhoon path translation on storm surge augmentation,the storm surge during Typhoon 1909 Lekima in the East China Sea is simulated using Delft 3D.The model sets up three scenarios to analyze the path’s effect on storm surge in the Shandong Peninsula Sea by shifting the typhoon path to the east and west.Results show that the areas of maximum storm surge in each scenario are located on both sides of the typhoon path and shift along with its movement.When the typhoon path shifts eastward,the maximum storm surge intensifies at Zhifu Island station 8 hours earlier.Conversely,a westward shift in the typhoon track leads to a maximum storm surge increase at Shidao Island station 12 hours earlier.Other scenarios exhibit minimal deviation from the original route.Typhoons penetrating deep inland can induce substantial storm surges,with the most extensive surge area situated in the western part of the Shandong Peninsula.
基金supported by the Geological Exploration Project Fund of Shandong Province([2018]19,[2019]54,[2021]1,[2022]6).
文摘The lithospheric thinning and huge gold mineralization in the Jiaodong Peninsula is intensively studied,aiming to better understand the geodynamic setting of the magmatic petrogenesis and the relationship between magmatism and large-scale mineralization.Thus,we conducted detailed research on the Weideshan intrusions in the Jiaodong region,including fi eld investigations,geochemical,geochronological and Hf isotope analysis,to reveal the tectonic implications for the destruction of the eastern North China Craton(NCC).The Weideshan intrusions consist of quartz monzodiorite,quartz monzonite and monzogranite.The SHRIMP zircon U-Pb dating results show that the Weideshan intrusions are emplaced at 115–112 Ma,namely,in the late Early Cretaceous period.Rocks of Weideshan intrusions are high-K calc-alkaline series and metaluminous granites.The trace elements are characterized by enrichment of Rb,Ba,Sr and LREE,with unobvious Eu anomalies and depletion of Nb,Ta,Zr,Hf and Ti.The contents of Ba and Sr are(913.00–1562.00)/1199.29μg/g and(373.00–793.00)/536.71μg/g,respectively,showing the features of high Ba–Sr granites(HBS).Development of numerous dark enclaves and negativeεHf(t)values(−17.93 to−12.19)indicate that the Weideshan granites originate from the mixture of crustal-derived felsic magma from partial melting of the Paleoproterozoic crust and alkali-rich magma from the enriched mantle.The generation of the Weideshan granites was closely related to the asthenospheric upwelling during the lithosphere thinning of the NCC in the late Mesozoic.
基金Funding Statement:This research was funded by Ministry of Science,Technological Development and Innovation of the Republic of Serbia(Grants Nos.451-03-137/2025-03/200125&451-03-136/2025-03/200125).
文摘Since its description,the taxon Ophrys sphegodes subsp.grammica has been considered endemic to Greece.The morphological and chorological data of this taxon have been overlooked because the name has been used as a synonym for O.sphegodes subsp.taurica in most publications and online databases.Recently discovered Ophrys populations in Serbia were identified as O.sphegodes subsp.grammica.As these populations represent the northernmost point of distribution of this taxon,we provided data on the morphology,flowering season,and ecology.To determine the taxonomic status of this taxon,we performed comparative morphological analyses,comparing them to other populations of affined taxa(O.sphegodes subsp.grammica,O.sphegodes subsp.taurica,and O.sphegodes subsp.sphegodes).The analysis included 23 morphometric characters,performed on a total of 120 individuals.Examined populations of O.sphegodes subsp.grammica are closely associated with populations of O.sphegodes subsp.sphegodes,with near overlap in the values of the characteristics evaluated,indicating that this subspecies is more morphologically similar to the typical one than to O.sphegodes subsp.taurica.Although O.sphegodes subsp.grammica and O.sphegodes subsp.sphegodes are morphologically similar,the flowers of the first taxon are smaller,as evidenced by the length and width of the stigmatic cavity,as well as the length of the petals and labellum.The labellum of O.sphegodes subsp.grammica is shorter than the dorsal sepal,and this feature distinguishes it from both the typical subspecies and O.sphegodes subsp.taurica,where it is longer.The results of this study clearly show that the name O.sphegodes subsp.grammica should not be equated with O.sphegodes subsp.taurica,since it is a morphologically distinct and well-defined taxon.
基金supported by the National Natural Science Foundation of China(No.42302079)Deep Earth Probe and Mineral Resources Exploration-National Science and Technology Major Project(No.2024ZD1001301)Geological Surveying Project of CGS(No.DD20230356)。
文摘Recently identified hydrothermal monazite from the Sidaogou deposit in the Liaodong Peninsula,is co-genetic with gold-bearing ore minerals and thus can serve as ideal proxy for dating the gold-mineralization event.Our study effectively solved the dilemma of lack of any accurate age for the Sidaogou deposit.The Sidaogou deposit is hosted mainly by Paleoproterozoic metamorphic rocks of the Liaohe Group,and hydrothermal monazite therein occurs within voids or along micro-fractures in syn-ore pyrite and quartz.First in situ SIMS U-Th-Pb isotope data on this monazite from the Sidaogou deposit yielded an inverse Concordia age of 184±20 Ma,which is much younger than an^(40)Ar-^(39)Ar age of 1858.9±25.4 Ma obtained on muscovite from the host rock(Gaixian Formation),thus supporting a prominent Early Jurassic gold mineralization event in the Wulong gold field,which is distinct from previously established Early Cretaceous gold mineralization,held responsible for the nearby large Wulong gold deposit.Our new findings make it possible,together with previous studies,to formulate a model for the Early Jurassic magmatic-hydrothermal gold system in the area,for which a compressional setting during the westward subduction of the Paleo-Pacific Plate beneath the North China Craton is postulated.
基金financially supported by the National Key Research and Development Program of China(Grant No.2023YFC2906900)Key Research and Development Program of Shandong Province(Grant No.2023CXGC011001)+2 种基金The Taishan Scholars Talent Project(TSTP 20240847)The Open Project of Technology Innovation Center for Deep Gold Resources Exploration and Mining,Ministry of Natural Resources(Grant No.SDK202211,SDK202214)Science and Technology Project of Shandong Bureau of Geology and Mineral Exploration and Development(Grant No.KY202208)。
文摘The Taishang-Shuiwangzhuang gold deposit is located in the southeastern margin of Linglong gold field in the northern part of the Zhaoping Fault metallogenic belt of the Jiaodong gold province-the world’s third-largest gold metallogenic area.Major prospecting breakthroughs have been made at the depth of 600‒2500 m in recent years,with cumulative proven gold resources exceeding 700 t.Based on a large number of exploration data,the main characteristics of the deposit are described in detail,and the spatial coupling relationship between ore-controlling fault and main orebodies is discussed.The main orebodies occur as regular large veins,exhibiting branching and combination,expansion and contraction,and pinch-out and reoccurrence.They extend in a gentle wave pattern along their strikes and dip directions and generally have a pitch direction of NEE and a plunge direction of NEE.As the ore-controlling fault,the Zhaoping Fault has the characteristics of wave-like fluctuation,with its dip angle presenting three steps of steep-slow transition within the depth range of 2500 m.The gold mineralization enrichment area is mainly distributed in the step parts where the fault plane changes from steeply to gently.The ore-forming age,ore-forming fluid and ore-forming material sources and the genesis of the ore deposit are analyzed based on the research results of ore deposit geochemistry.The ore-forming fluids were H_(2)O-CO_(2)-NaCl-type hydrothermal solutions with a medium-low temperature and medium-low salinity.The H-O isotopic characteristics indicate that the fluids in the early ore-forming stage were possibly formed by degassing of basic magma and that meteoric water gradually entered the ore-forming fluids in the late ore-forming stage.The S and Pb isotopes indicate that the ore-forming materials mainly originate from the lower crust and contain a small quantity of mantle-derived components.The comprehensive analysis shows that the Taishang-shuiwangzhuang gold deposit was a typical“Jiaodong type”gold deposit.The strong crust-mantle interactions,large-scale magmatism,and the material exchange arising from the transformation from the ancient lower crust to the juvenile lower crust during the Early Cretaceous provided abundant fluids and material sources for mineralization.Moreover,the detachment faults formed by the rapid magmatic uplift and the extensional tectonism created favorable temperature and pressure conditions and space for fluid accumulation and gold precipitation and mineralization.
文摘山东北部沿海平原区小麦-玉米周年两吨粮超高产技术创建是中国农业大学作物化控团队和莱州市金海种业在山东省莱州市开展的一项重要农业生产示范项目。通过精选良种、合理密植及水肥一体化等措施,以期实现小麦和玉米的高产高效种植。在2023年该地块小麦和玉米两季的种植中,现场实测每公顷的总产量达到了31,323.90 kg(折合2088.26 kg mu-1)。其中冬小麦由农业农村部组织专家测产打破了黄淮海地区小麦的单产纪录,实际产量高达13,213.35 kg hm-2(折合880.89 kg mu-1)。种植品种烟农1212每平方米穗数为692.0,穗粒数为40.1,千粒重为52.55 g,单株产量为4.74 g,收获指数为0.56,水分利用效率为3.24 kg m-3。夏玉米中金玉2513的每平方米穗数为9.1,穗粒数为584.7,千粒重为379.31 g,单株产量为206.25 g,收获指数为0.58,水分利用效率为2.86 kg m-3,实际产量为18,110.55 kg hm-2(折合1207.37 kg mu-1)。在2024年的重复试验中,小麦-玉米的实际产量继续达到30,997.00 kg hm-2(折合2065.13 kg mu-1)。本文旨在总结高产纪录小麦-玉米复种高产田生产过程的主要管理环节和高产群体的主要指标,为山东北部沿海平原区小麦-玉米复种高产提供参考。
文摘Leizhou Peninsula, located at southem end of mailand China, has 9 284.3 ha mangrove distributed more than 100 sites along its inlets and open coastlines. This paper presents the surveys on mangrove area in Leizhou Peninsula during 2000 and 2008, especially the survey in the eight major mangrove areas in 2002. The flora recorded in mangrove systems includes 69 large algea species, 13 native true mangrove species, nine native semi-mangrove species, and another seven intoduced true mangrove species with Sonneratia apetala as the quickest growing exotic mangrove species dominatant in the mangrove plantations, and more than 100 land flora species, consisting of 17 main mangrove associations. The plant biodiversity habitats remained mainly small patches and diverse, and were becoming worse under the intensive disturbance of human acitivities and coastal pollutions, which decreased the value of mangrove coasts as the important sites for flying-by migrating birds in Leizhou Peninsula. The effective mangrove conservation measures should be implemented.
基金The paper was supported by the project of integrated mangrove management and coastal protection(IMMCP) in Leizhou Peninsula Guangdong Province.
文摘The exotic Sonneratia apetala in Leizhou Peninsula, has shown outstanding fast-growing ability in restored mangrove forests, at the middle and high tide intertidal zone, with year-round fresh water input from drainage. By setting plot and selecting standard tree, investigation and measurement on height growth, diameter growth, biomass, productivity, and so on, were made in a S. apetala plantation at age of six at Lanbei, Fucheng, Leizhou Peninsula in May 2001. The investigating results showed that the mean annual height growth of plantation was 2.03 m and mean annual growth of diameter at breast height (DBH) was 2.35 cm. There exists a significant correlation between the diameter at ground surface (DGS) and DBH. The average biomass of a single standard tree in dry weight was 95.647 kg/m2. A ratio of above-ground biomass to under-ground biomass was 1.60. The stand biomass of unit area was 22.955 kg/m2, singletree wood volume was 88.23 dm3, and the annual wood volume productivity (PA) of the same year was 0.407. The forest energy accumulation was 424.851 MJ/m2, with annual solar energy fixing rate of 40.68 ×10-7%. It is concluded that S. apetala species had characteristics of outstanding high biomass accumulation and could be used as coastal planting tree species in southern China.
文摘After a field work on recently raised coastal features in South Shetland Islands, we conclude that there are three kinds of recent coastal features, i. e, fragmental coast, rock coast, and ice cliff coast. The processes and forms of the fragmental cost formed by wave action with floating ice are studied. Systematic study of the raised coasts enables us to distinguish two groups of the coasts by an elevation of 20m a. s. 1. The raised coasts above 20m a. s. 1. belong to older group and those below 20m a. s. 1. belong to younger group. Mean uplift rate of coast in this area is 6. 7 mm/a.
