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Variability in evapotranspiration shifts from meteorological to biological control under wet versus drought conditions in an alpine meadow

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Journal of Plant ecology 2022年第5期15卷 921-932页

作者： Mingjie Xu Tingting An Zhoutao Zheng Tao Zhang Yangjian Zhang Guirui Yu College of Agronomy Shenyang Agricultural UniversityShenyang 110866China key laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 10010lChina center for excellence in tibetan plateau earth sciences Chinese Academy of SciencesBeijing 10010lChina College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China

The tibetan plateau is generally referred to as the Chinese water tower,and evapotranspiration(ET)affects the water budget and stability of alpine meadows on the tibetan ***,its variability and controlling mechanisms have not been well documented under the drier conditions induced by global ***,this study aimed to clarify whether meteorological or biological factors primarily affected the variability in ET under contrasting water conditions in the alpine meadow ecosystem on the tibetan *** on 6-year(2013-2018)eddy covariance observations and the corresponding meteorological and biological data,linear perturbation analyses were employed to isolate the contributions of meteorological and biological factors to the variability in evapotranspiration(SET).The results showed that ET was mainly driven by meteorological factors in wet peak seasons(July and August),and was dominated by net radiation(Rn)and air temperature(Ta),indicating that the inadequate available energy is the factor limiting ***,the dominant factors affecting SET shifted from meteorological to biological in dry peak seasons when the canopy stomatal conductance(gs)and leaf area index were *** this point,the ecosystem was limited by the water *** results provide empirical insights into how meteorological and biological factors regulate variability in ET under contrasting water *** findings can further improve our understanding of water cycle processes and can help effectively manage water resources in alpine meadow ecosystems under future climate change conditions.

关键词： ET climate effects biotic effects eddy covariance tibetan plateau

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气候变化驱动湖泊快速变暖和热浪增加

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Science Bulletin 2023年第14期68卷 1574-1584,M0004页

作者：王溪雯施坤张运林秦伯强张毅博王玮佳 R.Iestyn Woolway 朴世龙 Erik Jeppesen Taihu laboratory for Lake Ecosystem Research State Key Laboratory of Lake Science and EnvironmentNanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China key laboratory of Western China’s Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China University of Chinese Academy of sciences Beijing 100049China College of Nanjing University of Chinese Academy of SciencesNanjing 211135China School of Ocean sciences Bangor UniversityMenai BridgeAnglesey LL572DGUK Sino-French Institute for earth System Science College of Urban and Environmental SciencesPeking UniversityBeijing 100871China key laboratory of alpine ecology Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China center for excellence in tibetan earth Science Chinese Academy of SciencesBeijing 100101China Department of Ecoscience Aarhus UniversityAarhus C 8000Denmark Sino-Danish Centre for Education and Research Beijing 100039China Limnology laboratory Centre for Ecosystem Research and Implementation(EKOSAM)Department of Biological SciencesMiddle East Technical UniversityAnkara 06800Turkey Institute of Marine sciences Middle East Technical UniversityErdeneli-Mersin 33731Turkey

气候变化导致的湖泊表层水体变暖和热浪增加可能严重威胁湖泊生态系统.由于大尺度模拟时,湖泊模型精度受限,故对湖泊水温变化的准确量化依然存在不确定性.本研究以中国湖泊为例,采用了一种耦合卫星观测水温和湖泊物理模型的方法模拟了19... 详细信息

气候变化导致的湖泊表层水体变暖和热浪增加可能严重威胁湖泊生态系统.由于大尺度模拟时,湖泊模型精度受限,故对湖泊水温变化的准确量化依然存在不确定性.本研究以中国湖泊为例,采用了一种耦合卫星观测水温和湖泊物理模型的方法模拟了1980-2100年间的水温,并探索了水温在多方面的变化.研究发现1980-2021年间中国湖泊表层水温以0.11℃/10a的速率上升,约为使用单独湖泊模型模拟结果的一半.湖泊水温在不同季节、不同地区的非对称增温导致水温的春夏季季节性在中国东部平原湖泊减弱,在高原湖泊增强.伴随湖泊水温的长期上升趋势,湖泊热浪的持续时间平均每10年延长7.7天.在温室气体高排放情景下,21世纪末湖泊表层水温的气候态年均值相比历史时期将增加2.2℃热浪的年持续时间将增加197天.湖泊物理环境的剧变意味着湖泊将面临严重的人类活动压力,这会进一步威胁水生生态系统的生物多样性和人类健康.

关键词：表层水温物理环境速率上升高原湖泊气候变化湖泊生态系统卫星观测物理模型

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Biotic effects dominate the inter-annual variability in ecosystem carbon exchange in a tibetan alpine meadow

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Journal of Plant ecology 2022年第5期15卷 882-896页

作者： Mingjie Xu Yi Sun Tao Zhang Yangjian Zhang Juntao Zhu Yongtao He Liwei Wang Guirui Yu College of Agronomy Shenyang Agricultural UniversityShenyang 110866China Huludao Meteorological Bureau of Liaoning Province Huludao 125080China key laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China center for excellence in tibetan plateau earth sciences Chinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

The alpine meadow ecosystem in Tibet is fragile and sensitive,and its carbon sink function with respect to climate change has become a matter of widespread ***,this study aims to clarify the inter-annual variations(IAVs)in the carbon fluxes in an alpine meadow and to further quantify the contributions of the driving factors to the *** on 7 years of flux data(2012-2018)and the corresponding climatic and biotic data,a set of look-up tables was used to separate and quantify the IAV ***,linear perturbation analyses were employed to quantify the contributions of each key *** 2012-2018,the net ecosystem productivity(NEP),gross primary productivity(GPP)and ecosystem respiration(Re)of this alpine meadow were 3.31±26.90,210.18±48.35 and 206.88±28.45 g C m^(-2) y^(-1),respectively,which indicated relatively large *** the contributions of climatic and biotic effects were distinguished and quantified,the dominant effects of biotic factors ***,negative interactions between climatic and biotic effects were *** the climatic factors,only soil water content contributed relatively more to the IAVs and played a role in regulating the interactions between climatic and biotic *** results suggest that biotic effects must be carefully considered to reduce the uncertainties associated with future carbon flux estimates.

关键词： biotic controls climatic controls carbon flux productivity grassland

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青藏高原植被结构变化反映环境变迁

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Science Bulletin 2023年第17期68卷 1928-1937页

作者：王艳芬薛凯胡容海丁柏阳曾弘李瑞津徐斌庞哲宋小宁李聪佳杜剑卿杨秀春张泽林郝彦宾崔骁勇郭柯高清竹张扬建朱军涛孙建李耀明姜丽丽周华坤罗彩云张振华高庆波陈世龙纪宝明徐兴良陈槐李奇赵亮徐世晓刘雅莉胡林勇武建双杨其恩董世魁贺金生赵新全汪诗平朴世龙于贵瑞傅伯杰 College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Beijing Yanshan earth Critical Zone National Research Station University of Chinese Academy of SciencesBeijing 101408China State key laboratory of tibetan plateau earth System Environment and ResourcesInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China State key laboratory of plateau ecology and Agriculture Qinghai UniversityXining 810016China key laboratory of Adaptation and Evolution of plateau Biota Northwest Institute of Plateau BiologyChinese Academy of SciencesXining 810001China Binzhou Institute of Technology Weiqiao-UCAS Science and Technology ParkBinzhou 256606China College of Mining Engineering North China University of Science and TechnologyTangshan 063210China key laboratory of Agri-Informatics Ministry of Agriculture and Rural AffairsInstitute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081China College of Life sciences University of Chinese Academy of SciencesBeijing 100049China School of Grassland Science Beijing Forestry UniversityBeijing 100083China State key laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural SciencesBeijing 100081China key laboratory for Agro-Environment&Climate Change Ministry of AgricultureBeijing 100081China key laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China key laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration Biodiversity Conservation key laboratory of Sichuan Province Chengdu Institute of BiologyChinese Academy of SciencesChengdu 610041China Zoige Peatland and Global Change Research Station Chinese Academy of SciencesHongyuan 62

草地植被结构对于其生产和生态功能至关重要,但大尺度信息严重匮乏.本研究结合多源遥感数据和深度学习,在区域尺度上厘清了青藏高原高寒草地基于群系的植物群落结构空间格局,并比较了其历史变化.过去40年,高寒草甸在高寒草地中的比例从... 详细信息

草地植被结构对于其生产和生态功能至关重要,但大尺度信息严重匮乏.本研究结合多源遥感数据和深度学习,在区域尺度上厘清了青藏高原高寒草地基于群系的植物群落结构空间格局,并比较了其历史变化.过去40年,高寒草甸在高寒草地中的比例从50%上升到69%,反映了变暖变湿的环境变化.此外,高寒草甸和高寒草原中高山嵩草草甸和紫花针茅草原的优势度分别增强到76%和92%.其中,气候因子驱动了紫花针茅草原近些年的分布;高山嵩草草甸近些年的分布则并非完全由气候驱动,人类活动可能起重要作用.本研究首次探索了区域尺度植被结构特征与历史变化,为认识青藏高原草地变化的驱动力及其空间异质性提供了新视角.

关键词：高寒草地植被结构草地植被多源遥感数据深度学习植物群落结构区域尺度高寒草原

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High nitrogen fertilizer input enhanced the microbial network complexity in the paddy soil

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Soil ecology Letters 2024年第2期6卷 97-109页

作者： Yanan Chen Yan Li Tianyi Qiu Haoran He Ji Liu Chengjiao Duan Yongxing Cui Min Huang Chunyan Wu Linchuan Fang The Research center of Soil and Water Conservation and Ecological Environment Chinese Academy of Sciences and Ministry of EducationYangling712100China State key laboratory of Soil Erosion and Dryland Farming on the Loess plateau Institute of Soil and Water Conservation CAS and MWRYangling712100China University of Chinese Academy of sciences Beijing100049China Institute of Environment Resource and Soil Fertilizer Zhejiang Academy of Agricultural SciencesHangzhou310021China College of Natural Resources and Environment Northwest A&F UniversityYangling712100China Hubei Province key laboratory for Geographical Process Analysis and Simulation Central China Normal UniversityWuhan430079China Department of Ecohydrology Leibniz Institute of Freshwater Ecology and Inland FisheriesBerlin12587Germany Sino-French Institute for earth System Science College of Urban and Environmental SciencesPeking UniversityBeijing100871China College of Resources and Environmental Engineering Wuhan University of TechnologyWuhan430070China cas center for excellence in Quaternary Science and Global Change Xi’an710061China

N fertilizer altered bacterial community compositions by changing soil nutrients.•Bacterial ammonia oxidation became predominated with the increasing N rate.•Excessive N input caused the information of a more complex microbial network.•Intensified microbial competition by excessive N was due to negative link ***(N)fertilization drives the structure and function of soil microbial communities,which are crucial for regulating soil biogeochemical cycling and maintaining ecosystem *** the N fertilizer effects on soil microbial composition and diversity have been widely investigated,it is generally overlooked that ecosystem processes are carried out via complex associations among microbiome ***,we examined the effects of five N fertilization levels(0,135,180,225,and 360 kg N ha−1)on microbial co-occurrence networks and key functional taxa such as ammonia-oxidizers in paddy *** results showed that N addition altered microbial community composition,which were positively related to soil total N and available phosphorus(P)*** abundance of ammonia-oxidizing archaea(AOA)significantly decreased after N addition,whereas ammonia-oxidizing bacteria(AOB)increased in N360 *** with low-N group(N0 and N135),the high-N group(N225 and N360)shaped more complex microbial webs and thus improved the stability of the microbial *** least squares path modeling further revealed that N fertilizer had a higher effect on microbial network complexity in the high-N group(0.83)than the low-N group(0.49).Although there were more positive links across all microbial networks,the proportion of negative links significantly increased in the high-N network,suggesting that excess N addition aggravated the competition among microbial *** these interactions between microbial communities and N fertilization advances our understanding of biogeochemical processes in paddy soils and their effects on nutrient supply to

关键词： nitrogen fertilizer paddy soil co-occurrence network microbial interaction

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Megadrought and cultural exchange along the proto-silk road

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Science Bulletin 2021年第6期66卷 603-611,M0004页

作者： Liangcheng Tan Guanghui Dong Zhisheng An RLawrence Edwards Haiming Li Dong Li Robert Spengler Yanjun Cai Hai Cheng Jianghu Lan Rustam Orozbaev Ruiliang Liu Jianhui Chen Hai Xu Fahu Chen State key laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China center for excellence in Quaternary Science and Global Change Chinese Academy of SciencesXi’an 710061China Institute of Global Environmental Change Xi’an Jiaotong UniversityXi’an 710054China Open Studio for Oceanic-Continental Climate and Environment Changes Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266061China key laboratory of Western China’s Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Department of earth and Environmental sciences University of MinnesotaMinneapolis 55455USA School of Geography Nanjing Normal UniversityNanjing 210097China Institution of Chinese Agricultural Civilization Nanjing Agricultural UniversityNanjing 210095China Library of Chang’an University Xi’an 710064China Max Planck Institute for the Science of Human History Jena 07745Germany Research center for ecology and Environment of Central Asia(Bishkek) Chinese Academy of SciencesBishkek 720040Kyrgyzstan Institute of Geology National Academy of Sciences of Kyrgyz RepublicBishkek 720040Kyrgyzstan School of Archaeology University of OxfordOxford OX13TGUK Institute of Surface-earth System Science Tianjin UniversityTianjin 300072China key laboratory of alpine ecology and Biodiversity Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

Arid Central Asia(ACA), with its diverse landscapes of high mountains, oases, and deserts, hosted the central routes of the Silk Roads that linked trade centers from East Asia to the eastern *** pockets and ecoclines in ACA are largely determined by local precipitation. However, little research has gone into the effects of hydroclimatic changes on trans-Eurasian cultural exchange. Here,we reconstruct precipitation changes in ACA, covering the mid-late Holocene with a U-Th dated, ~3 a resolution, multi-proxy time series of replicated stalagmites from the southeastern Fergana Valley,Kyrgyzstan. Our data reveal a 640-a megadrought between 5820 and 5180 a BP, which likely impacted cultural development in ACA and impeded the expansion of cultural traits along oasis routes. Instead,it may have diverted the earliest transcontinental exchange along the Eurasian steppe during the 5 th millennium BP. With gradually increasing precipitation after the megadrought, settlement of peoples in the oases and river valleys may have facilitated the opening of the oasis routes, ‘‘prehistoric Silk Roads", of trans-Eurasian exchange. By the 4 th millennium BP, this process may have reshaped cultures across the two continents, laying the foundation for the organized Silk Roads.

关键词： Megadrought Trans-Eurasian exchange Silk Roads Arid Central Asia Mid-Holocene

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气候变化驱动湖泊快速变暖和热浪增加（英文）

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Science Bulletin 2023年第14期 1574-1584页

作者：王溪雯施坤张运林秦伯强张毅博王玮佳 R.Iestyn Woolway 朴世龙 Erik Jeppesen Taihu laboratory for Lake Ecosystem Research State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences key laboratory of Western China's Environmental Systems (Ministry of Education) College of Earth and Environmental Sciences Lanzhou University University of Chinese Academy of sciences College of Nanjing University of Chinese Academy of Sciences School of Ocean sciences Bangor University Sino-French Institute for earth System Science College of Urban and Environmental Sciences Peking University key laboratory of alpine ecology Institute of Tibetan Plateau Research Chinese Academy of Sciences center for excellence in tibetan earth Science Chinese Academy of Sciences Department of Ecoscience Aarhus University Sino-Danish Centre for Education and Research Limnology laboratory Centre for Ecosystem Research and Implementation (EKOSAM) Department of Biological Sciences Middle East Technical University Institute of Marine sciences Middle East Technical University

气候变化导致的湖泊表层水体变暖和热浪增加可能严重威胁湖泊生态系统.由于大尺度模拟时,湖泊模型精度受限,故对湖泊水温变化的准确量化依然存在不确定性.本研究以中国湖泊为例,采用了一种耦合卫星观测水温和湖泊物理模型的方法模拟了19...

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Research progress and prospect of grassland degradation based on bibliometrics analysis during 1970–2020

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Ecological Economy 2020年第4期16卷 291-306页

作者： LI Tong XU Zhi-hong SONG Xiu-fang CUI Xiao-yong WANG Yan-fen University of Chinese Academy of sciences Beijing 100049CHINA Environmental Futures Research Institute Griffith UniversityNathanBrisbaneQLD 4111AUSTRALIA cas center for excellence in tibetan plateau earth Science Chinese Academy of SciencesBeijing 100101CHINA Yanshan earth Critical Zone and Surface Fluxes Research Station Chinese Academy of SciencesBeijing 100049CHINA National Science Library Chinese Academy of SciencesBeijing 100190CHINA

To understand the research trends and areas of focus on the grassland degradation(GD),a bibliometric study based on the Science Citation Index-Expanded(SCI-E)was *** study presented a comprehensive overview of the field based on the annual papers,research areas,temporal trends in keywords,marked journals,institutions,and *** the SCI-E database,GD publications first appeared ***,we chose the study period between 1970 and *** results showed that the annual number of publications increased in exponential model,with an especially rapid increase after *** S.K.,Wang S.P.,and Liu *** the most competitive authors based on their large numbers of papers and citations.A keyword analysis indicated that“grazing,alpine grassland,soil carbon and nitrogen,plant diversity,vegetation restoration”was the most popular study *** institution with the greatest research publications and most citations was the Chinese Academy of *** of Arid Environments was one of the most popular journals for researchers to publish their research and had greater influence in the field with larger citations than other *** science and ecology,soil science,plant science,biodiversity protection,geoscience,and water resources were the most popular Web of Science research *** keywords knowledge map mainly divides into four clusters,which are“vegetation”,“soil carbon”,“climate change”,and“grazing”.The ten clusters of the author’s co-occurrence analysis showed that the research areas of GD mainly concentrate on alpine grassland of Qinghai tibetan plateau and temperate steppe of Inner *** under global climate change and the increasing human activities,they were continually increasing close attention to the *** research methods are mainly in the combination of micro and macro view,such as high-throughput sequencing of the microbial community,remote sensing,quantitative analysis of models,*** current inter

关键词： grassland degradation temporal evolution network bibliometrics system analysis

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Fundamental Strategic Shift Required by the Expensive Ecological Policy in Chinese Grasslands

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Journal of Resources and ecology 2022年第6期13卷 955-963页

作者： ZHU Jiapei XU Xingliang LI Tong LIU Yali YANG Yaqian CUI Xiaoyong Sino-Danish College University of Chinese Academy of SciencesBeijing 100049China Sino-Danish center for Education and Research Beijing 100049China key laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China cas center for excellence in tibetan plateau earth sciences Chinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China College of Life sciences University of Chinese Academy of SciencesBeijing 100049China Beijing Yanshan earth Critical Zone and Surface Fluxes National Research Station University of Chinese Academy of SciencesBeijing 101408China

Grasslands have critically important ecological and economic values while most of them have been suffering from various degrees of degradation in China due to overgrazing. The “Forage-Livestock Balance”(FLB)policy has been implemented for more than a decade, aims to balance the relationship between forage productivity and grazing consumption of grasslands by livestock. According to the review of statistical data and literatures on policy evaluation, FLB-dominated subsidies for grassland ecological conservation policies are ineffective on grassland restoration, livestock reduction in some overloaded areas and improvement on herdsmen livelihood. To deal with the dilemma, we suggest a fundamental shift of strategy from controlling livestock numbers to maintaining and improving grassland health(MIGH) based on ecological theories, and promote the sustainable development of grassland in China. The results show that, FLB policy failed to obtain expected benefits mainly because it interfered with the herders’ autonomous use of contracted grasslands along with the defects of its underlying theory and methodologies. Implementing reward and punishment based on ecosystem health will not only motivate herders to manage their grassland autonomously, but also be more scientific and feasible than FLB.

关键词： forage-livestock balance grassland degradation grassland restoration herders’livelihood subsidy

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Vegetation Pattern in Northern Tibet in Relation to Environmental and Geo-spatial Factors

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Journal of Resources and ecology 2018年第5期9卷 526-537页

作者： TIAN Li ZHANG Yangjian Claus HOLZAPFEL HUANG Ke CHEN Ning TAO Jian ZHU Juntao Lhasa plateau Ecosystem Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences＋ Beijing 100101China Chinese Academy of sciences center for excellence in tibetan plateau earth sciences Belling 100101＋ China Qianyanzhou Ecological Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101＋ China Department of Biological sciences RutgersThe State University of New Jersey195 University AvenueNewark NJ 07102USA

Environmental and Geo-spatial factors have long been considered as crucial determinants of species composition and distributions. However,quantifying the relative contributions of these factors for the alpine ecosystems is lacking. The tibetan plateau has a unique ecological environment and vegetation types. Our objectives are to quantify the spatial distributions of plant communities on the Northern tibetan alpine grasslands and to explore the relationships between vegetation composition,Geo-spatial factors and environmental factors. We established 63 field plots along a 1200-km gradient on the Northern tibetan plateau alpine Grassland and employed the two-way indicator species analysis（TWINSPAN） and the detrended canonical correspondence analysis（DCCA）. Fourteen communities of alpine grassland were identifiable along the transect and consisted of three vegetation types： alpine meadow,alpine steppe,and desert steppe. Vegetation composition and spatial distribution appeared to be largely determined by mean annual precipitation and less influenced by temperature. A large fraction（73.5%） of the variation in vegetation distribution was explained by environmental variables along this transect,somewhat less by Geo-spatial factors（56.3%）. The environmental and Geo-spatial factors explained 29.6% and 12.3% of the total variation,respectively,while their interaction explained 43.9%. Our findings provide strong empirical evidence for explaining biological and environmental synergetic relationships in Northern Tibet.

关键词： alpine grasslands environmental interpretation spatial pattern tibetan plateau vegetation composition

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