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A review of physicochemical properties of dissolved organic carbon and its impact over mountain glaciers

Journal of Mountain Science 2024年第1期21卷 1-19页

作者： NIU Hewen CHEN Mengxue KANG Shichang SHUKLA Tanuj QIN Huili GAO Wanni HUANG Shihai ZHANG Fu State Key Laboratory of Cryospheric Sciences/national field Science Observation and research station of Yulong Snow Mountain Cryosphere and Sustainable Development Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Politics and International Relations Lanzhou UniversityLanzhou 730000China University of Chinese Academy of Sciences Beijing 10049China Dagu Glacier Scenic and Historic Interest Area Administration Luhua TownHeishui 615715China

Investigating the characteristics and transformation of water-soluble carbonaceous matter in the cryosphere regions is important for understanding biogeochemical process in the earth ***-soluble carbonaceous matter is a heterogeneous mixture of organic compounds that is soluble in aquatic *** its importance,we still lack systematic understanding for dissolved organic carbon(DOC)in several aspects including exact chemical composition and physical interactions with microorganisms,glacier *** review presents the chemical composition and physical properties of glacier DOC deposited through anthropogenic emission,terrestrial,and biogenic *** present the molecular composition of DOC and its effect over snow albedo and associated radiative *** indicate that DOC in snow/ice is made up of aromatic protein-like species,fulvic acid-like materials,and humic acid-like ***-absorbing impurities in surface snow and glacier ice cause considerable albedo reduction and the associated radiative forcing is definitely ***-soluble carbonaceous matter dominated the carbon transport in the high-altitude glacial *** to prevailing global warming and projected increase in carbon emission,the glacial DOC is expected to release,which will have strong underlying impacts on cryosphere *** results of this work have profound implications for better understanding the carbon cycle in high altitude cryosphere regions.A new compilation of globally distributed work is required,including large-scale measurements of glacial DOC over high-altitude cryosphere regions,to overcome and address the scientific challenges to constrain climate impacts of light-absorbing impurities related processes in Earth system and climate models.

关键词： Mountain glaciers Dissolved organic carbon Molecular composition Radiative forcing

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Characteristics and influencing factors of CO_(2) emission from inland waters in China

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Science China Earth Sciences 2024年第6期67卷 2034-2055页

作者： Ting ZHOU Xiaofeng WANG Zuolin XIAO Zhaoyin QING Xianxiang LI Jilong WANG Ziyi QUE Chongqing Key Laboratory of Carbon Cycling and Carbon Regulation in Mountainous ecosystems Chongqing 401331China School of Geography and Tourism Chongqing Normal UniversityChongqing 401331China Chongqing field Observation and research station of Earth Surface ecological Processes in Three Gorges Reservoir Area Chongqing 405400China School of Earth system Science Tianjin UniversityTianjin 300072China

Inland water bodies,being the most active biogeochemical cycle reactors,play a pivotal role in the global carbon cycle and CO_(2) *** study integrates existing observation dataset of CO_(2) flux(fCO_(2))in rivers,lakes and reservoirs in China,to elucidate their spatial-temporal patterns and key influencing factors and to reappraise the significance for regional carbon *** showed that,the fCO_(2) in rivers,lakes and reservoirs in China presented significant variability with large range of-379.3-4947.6,-160.1-785.0 and -74.0-1603.1 mg CO_(2)m-2h^(-1),*** median of the fCO_(2) in rivers was of 228.5 mg CO_(2)m^(-2)h^(-1),observably higher than these in lakes and reservoirs(26.0 and 28.3 mg CO_(2)m^(-2)h^(-1),respectively).The fCO_(2)in rivers and reservoirs exhibited similar decreasing trend from south to north as a result of universal climate restraint,the averaged fCO_(2) in Pearl River and Yangtze River basins showed much higher than that in Northeastern ***,the averaged fCO_(2) in the Mongolia-Xinjiang lake district and the Northeast lake district were higher than other lake districts,followed by the Qinghai-Xizang lake district,and the Eastern and Yungui lake district were generally low,contradicting the climatic *** water primary production enhancement resulting from human activities was the main driver of spatial variation in the fCO_(2) in ***,the fCO_(2) in rivers presented seasonal pattern with higher wet season than dry season,while opposite patterns were found in lakes and *** temperature,precipitation and water primary production were main ***,it showed pH was a key factor indicating the variability of the fCO_(2) levels either in rivers,lakes or in *** lakes,the fCO_(2) is closely linked to chlorophyll a(Chl-a)and dissolved oxygen(DO),whereas,the fCO_(2) in rivers is primarily associated with organic carbon(OC)and total nitrogen(TN),highlighting the dive

关键词： Rivers/lakes/reservoirs CO_(2) emission Spatio-temporal variability Influence factors Regional contribution

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ecological impacts of the expansion of offshore wind farms on trophic level species of marine food chain

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Journal of Environmental Sciences 2024年第5期139卷 226-244页

作者： Lijing Wang Bangguo Wang Wenxi Cen Rui Xu Yuwei Huang Xin Zhang Yinghui Han Yuanxun Zhang College of Resources and Environment University of Chinese Academy of SciencesBeijing 101408China Yanshan Earth Critical Zone and Surface Fluxes research station University of Chinese Academy of SciencesBeijing 101408China Chinese research Academy of Environmental Sciences Beijing 100012China national Joint research Center for Yangtze River Conservation Beijing 100012China College of Environmental Engineering Beijing University of TechnologyBeijing 100124China Institute of eco-Environmental Forensics Shandong UniversityQingdao 266237China

The global demand for renewable energy has resulted in a rapid expansion of offshore wind farms(OWFs)and increased attention to the ecological impacts of OWFs on the marine *** reviews mainly focused on the OWFs’impacts on individual species like birds,bats,or *** review collected numerous field-measured data and simulated results to summarize the ecological impacts on phytoplankton,zooplankton,zoobenthos,fishes,and mammals from each trophic level and also analyze their interactions in the marine food *** and zooplankton are positively or adversely affected by the‘wave effect’,‘shading effect’,oxygen depletion and predation pressure,leading to a ±10% fluctuation of primary *** zoobenthos are threatened transiently by habitat destruction with a reduction of around 60% in biomass in the construction stage,their abundance exhibited an over 90% increase,dominated by sessile species,due to the‘reef effect’in the operation *** fishes and mammals are to endure the interferences of noise and electromagnetic,but they are also aggregated around OWFs by the‘reef effect’and‘reserve effect’.Furthermore,the complexity of marine ecosystem would increase with a promotion of the total system biomass by 40% through trophic cascade effects strengthen and resource partitioning alternation triggered by the proliferation of *** suitable site selection,long-term monitoring,and life-cycle-assessment of ecological impacts of OWFs that are lacking in current literature have been described in this review,as well as the carbon emission and deposition.

关键词： Offshore wind farms(OWFs) ecological impacts Plankton Benthos Fish Mammal

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Decoding the inconsistency of six cropland maps in China

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The Crop Journal 2024年第1期12卷 281-294页

作者： Yifeng Cui Ronggao Liu Zhichao Li Chao Zhang Xiao-Peng Song Jilin Yang Le Yu Mengxi Chen Jinwei Dong Institute of Geographic Sciences and Natural Resources research Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Department of Geographical Sciences University of MarylandCollege ParkMD 20740USA College of Grassland Science and Technology China Agricultural UniversityBeijing 100193China Ministry of Education ecological field station for East Asian Migratory Birds Department of Earth System ScienceInstitute for Global Change StudiesTsinghua UniversityBeijing 100084China Ministry of Education ecological field station for East Asian Migratory Birds Beijing 100084China Tsinghua University(Department of Earth system Science)-Xi’an Institute of Surveying and Mapping Joint research Center for Next-Generation Smart Mapping Beijing 100084China Institute of Remote Sensing and Geographic Information system Peking UniversityBeijing 100871China Department of Forest and Conservation Sciences University of British ColumbiaVancouverBCV6T 1Z4Canada

Accurate cropland information is critical for agricultural planning and production,especially in foodstressed countries like *** widely used medium-to-high-resolution satellite-based cropland maps have been developed from various remotely sensed data sources over the past few decades,considerable discrepancies exist among these products both in total area and in spatial distribution of croplands,impeding further applications of these *** factors influencing their inconsistency are also *** this study,we evaluated the consistency and accuracy of six cropland maps widely used in China in circa 2020,including three state-of-the-art 10-m products(i.e.,Google Dynamic World,ESRI Land Cover,and ESA WorldCover)and three 30-m ones(i.e.,GLC_FCS30,GlobeLand 30,and CLCD).We also investigated the effects of landscape fragmentation,climate,and agricultural *** using a ground-truth sample revealed that the 10-m-resolution WorldCover provided the highest accuracy(92.3%).These maps collectively overestimated Chinese cropland area by up to 56%.Up to 37%of the land showed spatial inconsistency among the maps,concentrated mainly in mountainous regions and attributed to the varying accuracy of cropland maps,cropland fragmentation and management practices such as *** work shed light on the promotion of future cropland mapping efforts,especially in highly inconsistent regions.

关键词： Consistency and accuracy 10-and 30 m Cropland mapping Agricultural management China

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Characteristics and influencing factors of COemission from inland waters in China

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Science China Earth Sciences 2024年

作者： Ting ZHOU Xiaofeng WANG Zuolin XIAO Zhaoyin QING Xianxiang LI Jilong WANG Ziyi QUE Chongqing field Observation and research station of Earth Surface ecological Processes in Three Gorges Reservoir Area Chongqing Key Laboratory of Carbon Cycling and Carbon Regulation in Mountainous ecosystems School of Geography and Tourism Chongqing Normal University School of Earth system Science Tianjin University

Inland water bodies, being the most active biogeochemical cycle reactors, play a pivotal role in the global carbon cycle and CO2budget. This study integrates existing observation dataset of CO2flux(f CO2) in rivers, lakes and reservoirs in China, to elucidate their spatial-temporal patterns and key influencing factors and to reappraise the significance for regional carbon balance. It showed that, the f CO2in rivers, lakes and reservoirs in China presented significant variability with large range of-379.3–4947.6,-160.1–785.0 and-74.0–1603.1 mg CO2m-2h-1, respectively. The median of the f CO2in rivers was of228.5 mg CO2m-2h-1, observably higher than these in lakes and reservoirs(26.0 and 28.3 mg CO2m-2h-1, respectively). The f CO2in rivers and reservoirs exhibited similar decreasing trend from south to north as a result of universal climate restraint, the averaged f CO2in Pearl River and Yangtze River basins showed much higher than that in Northeastern rivers. While, the averaged f CO2in the Mongolia-Xinjiang lake district and the Northeast lake district were higher than other lake districts, followed by the Qinghai-Xizang lake district, and the Eastern and Yungui lake district were generally low, contradicting the climatic *** water primary production enhancement resulting from human activities was the main driver of spatial variation in the f CO2in lakes. Meanwhile, the f CO2in rivers presented seasonal pattern with higher wet season than dry season, while opposite patterns were found in lakes and reservoirs. Seasonal temperature, precipitation and water primary production were main ***, it showed pH was a key factor indicating the variability of the f CO2levels either in rivers, lakes or in reservoirs. In lakes, the f CO2is closely linked to chlorophyll a(Chl-a) and dissolved oxygen(DO), whereas, the f CO2in rivers is primarily associated with organic carbon(OC) and total nitrogen(TN), highlighting the diverse controlling mechanisms of f

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Atmospheric nitrogen deposition affects forest plant and soil system carbon:nitrogen:phosphorus stoichiometric flexibility:A meta-analysis

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Forest ecosystems 2024年第3期11卷 307-317页

作者： Xiyan Jiang Xiaojing Wang Yaqi Qiao Yi Cao Yan Jiao An Yang Mengzhou Liu Lei Ma Mengya Song Shenglei Fu Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions College of Geography and Environmental ScienceHenan UniversityKaifeng475004China Henan Key Laboratory of Integrated Air Pollution Control and ecological Security College of Geography and Environmental ScienceHenan UniversityKaifeng475004China Henan Dabieshan national field Observation and research station of Forest ecosystem Henan UniversityZhengzhou450046China

Background:Nitrogen(N)deposition affects forest stoichiometric flexibility through changing soil nutrient availability to influence plant ***,the effect of N deposition on the flexibility of carbon(C),N,and phosphorus(P)in forest plant-soil-microbe systems remains ***:We conducted a meta-analysis based on 751 pairs of observations to evaluate the responses of plant,soil and microbial biomass C,N and P nutrients and stoichiometry to N addition in different N intensity(050,50–100,>100 kg·ha^(-1)·year^(-1)of N),duration(0–5,>5 year),method(understory,canopy),and matter(ammonium N,nitrate N,organic N,mixed N).Results:N addition significantly increased plant N:P(leaf:14.98%,root:13.29%),plant C:P(leaf:6.8%,root:25.44%),soil N:P(13.94%),soil C:P(10.86%),microbial biomass N:P(23.58%),microbial biomass C:P(12.62%),but reduced plant C:N(leaf:6.49%,root:9.02%).Furthermore,plant C:N:P stoichiometry changed significantly under short-term N inputs,while soil and microorganisms changed drastically under high N *** N addition primarily affected plant C:N:P stoichiometry through altering plant N content,while understory N inputs altered more by influencing soil C and P *** N significantly influenced plant and soil C:N and C:P,while ammonia N changed plant N:*** C:P and soil C:N were strongly correlated with mean annual precipitation(MAT),and the C:N:P stoichiometric flexibility in soil and plant under N addition connected with soil ***,N addition decoupled the correlations between soil microorganisms and the ***:N addition significantly increased the C:P and N:P in soil,plant,and microbial biomass,reducing plant C:N,and aggravated forest P ***,these impacts were contingent on climate types,soil layers,and N input *** findings enhance our comprehension of the plant-soil system nutrient cycling mechanisms in forest ecosystems and plant strategy responses to N deposition.

关键词： C:N:P stoichiometry Meta-analysis Forest ecosystem Nitrogen addition form Nutrient cycles

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Long-term in-situ monitoring of anchoring system and preliminary analysis of monitoring data

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Journal of Earth Science 2024年

作者： Luobin Zheng Huiming Tang Liangqing Wang Changdong Li Chengren Xiong Zongxing Zou Chenlu Wang Lingfeng Zhu Yifan Zhang Faculty of Engineering， China University of Geosciences Badong national Observation and research station of Geohazards，China University of Geosciences

The geological environment in which the reservoir slope is situated is intricate， influenced by factors such as precipitation and fluctuations in reservoir water levels. Furthermore， the anchoring structure embedded within the rock mass of the slope undergoes corrosion and deterioration due to these factors， resulting in a highly complex interaction process between the slope rock mass and the anchoring structure. The long-term safety of rock-anchored structure systems is closely tied to the construction and safe operation of reservoirs， as both internal and external factors play a role in ensuring their stability. The present study aims to investigate this intricate issue by designing and establishing an on-site comprehensive multi-field information monitoring platform. The multi-site information monitoring platform comprises three components， namely the landslide monitoring system， anchor structure monitoring system， and data management system. The landslide monitoring system encompasses the surveillance of surface deformation， subsurface deformation， and environmental factors. The monitoring system for anchor structures includes the monitoring of prestress， anchor cable strain， and corrosion status of steel bars. The establishment of a preliminary system for data transmission and management has been accomplished. The current monitoring results indicate that the health condition of the tested anchor cables is satisfactory， and the strain and corrosion status are influenced by the design of the anchor cable structure. The platform is currently undergoing enhancements with the incorporation of cutting-edge anchoring structure design and monitoring equipment.

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Seismic and geological evidence of hidden faults in the Yinpan Reservoir area based on a dense seismic array

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Science China Earth Sciences 2024年第7期67卷 2401-2407页

作者： Guangyao YIN Huai ZHANG Liwen GONG Q ipeng BAI Yicun GUO Bing ZHANG Yaolin SHI Key Laboratoryof Earth system Numerical Modeling and Application(Chinese Academyof Sciences) College of Earth and Planetary SciencesUniversity of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Computational Geodynamics Chinese Academy of SciencesBeijing 100049China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China Beijing Yanshan Critical Zone national field Scientific Observation and research station Beijing 101408China Chongqing Earthquake Agency Chongqing 401147 China Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China Hangzhou Applied Acoustics research Institute Hangzhou 311100China State Key Laboratory of Geodesy and Earths Dynamics Innovation Academy for Precision Measurement Science and TechnologyCASWuhan 430077China

*** November 23,2017,an M_(S)5.0 earthquake occurred in Wulong,Chongqing,China,resulting in tens of casualties and considerable economic ***,the epicenter of this earthquake was located in the transition zone from the... 详细信息

关键词： earthquake southeast seismic

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Evolution of drought and flood events on the Qinghai-Tibet Plateau and key issues for response

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Science China Earth Sciences 2023年第11期66卷 2514-2529页

作者： Jie LU Shu XU Tianling QIN Xin HE Denghua YAN Cheng ZHANG Sintayehu A.ABEBE State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100038China yinshanbeilu national field research station of steppe eco-hydrological system China Institute of Water Resources and Hydropower ResearchHohhot 010020China Hydraulic and Water Resources Engineering Department Debre Markos University Institute of TechnologyDebre Markos 999047Ethiopia

The Qinghai-Tibet Plateau is a climate-sensitive *** characteristics of drought and flood events in this region are significantly different as compared to other areas in the country,which could potentially induce a series of water security,ecological and environmental *** is urgent that innovative theories and methods for estimation of drought and flood disasters as well as their adaptive regulations are *** on extensive literature review,this paper identifies new situations of the evolution of drought and flood events on the Qinghai-Tibet Plateau,and analyzes the research progress in terms of monitoring and simulation,forecasting and early warning,risk prevention and emergency *** study found that there were problems such as insufficient integration of multi-source data,low accuracy of forecasting and early warning,unclear driving mechanisms of drought and flood disaster chains,and lack of targeted risk prevention and regulation *** this basis,future research priorities are proposed,and the possible research and development paths are elaborated,including the evolution law of drought and flood on the Qinghai-Tibet Plateau,the coincidence characteristics of drought and flood from the perspective of a water resources system,prediction and early warning of drought and flood coupled with numerical simulation and knowledge mining,identification of risk blocking points of drought and flood disaster chain and the adaptive ***,the paper will provide technical support for preventing flood and drought disasters,water resources protection,ecological restoration and climate change adaptation on the Qinghai-Tibet Plateau.

关键词： Drought and flood evolution Monitoring and simulation Prediction and early warning Risk prevention and emergency response Qinghai-Tibet Plateau

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Numerical manifold method for thermo-mechanical coupling simulation of fractured rock mass

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 1977-1992页

作者： Jiawei Liang Defu Tong Fei Tan Xiongwei Yi Junpeng Zou Jiahe Lv Faculty of Engineering China University of GeosciencesWuhan430074China Department of Civil Engineering Monash UniversityClaytonVIC3800Australia Badong national Observation and research station of Geohazards China University of GeoscienceWuhan430074China

As a calculation method based on the Galerkin variation,the numerical manifold method(NMM)adopts a double covering system,which can easily deal with discontinuous deformation problems and has a high calculation *** at the thermo-mechanical(TM)coupling problem of fractured rock masses,this study uses the NMM to simulate the processes of crack initiation and propagation in a rock mass under the influence of temperature field,deduces related system equations,and proposes a penalty function method to deal with boundary *** examples are employed to confirm the effectiveness and high accuracy of this *** the thermal stress analysis of a thick-walled cylinder(TWC),the simulation of cracking in the TWC under heating and cooling conditions,and the simulation of thermal cracking of the SwedishÄspöPillar Stability Experiment(APSE)rock column,the thermal stress,and TM coupling are *** numerical simulation results are in good agreement with the test data and other numerical results,thus verifying the effectiveness of the NMM in dealing with thermal stress and crack propagation problems of fractured rock masses.

关键词： Heat conduction Fractured rock mass Crack propagation Galerkin variation Numerical manifold method(NMM)

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