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Global Dryland ecosystem Programme(G-DEP):Africa consultative meeting report

Journal of Arid Land 2020年第3期12卷 538-544页

作者： PENG Yu FU Bojie ZHANG Linxiu YU Xiubo FU Chao Salif DIOP Hubert HIRWA Aliou GUISSE LI Fadong State Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China International Ecosystem Management Partnership United Nations Environment ProgrammeBeijing 100101China National Academy of Sciences of Senegal P.O.Box 4344 Dakar RPSenegal Faculty of Science and Technology University Cheikh Anta Diop of DakarP.O.Box 5005 Dakar-FannSenegal

In order to enhance and restore the ecosystems of natural capital in African arid regions,the Global Dryland ecosystem Programme(G-DEP)consultative meeting was hosted in Dakar,Senegal,from 23 to 25 September *** paper details the first African meeting of the *** meeting reviewed preceding dryland ecosystems case studies,identified vulnerable arid and semi-arid regions,and proposed sustainable solutions to *** also identified the successes and failures of previous attempts to improve vulnerable ecosystems and ultimately formed an action plan to improve these ***,ecosystems,and livelihoods for Sustainable Development Goals(SDGs),Great Green Wall Initiative(GGWI)for Sahara and Sahel,and China-Africa cooperation on science,technology,and innovation are three extra main sections concerned of the ***,more specific topics as the complicated relationship between these natural processes and human activity,including pastoralism,soil restoration,and vegetation regenerate techniques,were fully *** meeting also identified the positive effects international collaboration can have on dryland regions,specifically in the capacity of sharing information,technology,and innovation on purpose to develop a joint proposal for long-term research programs in African arid and semi-arid ***,meetings that review the progress made on ecosystem management for the sustainable livelihoods in Africa,identification of priority areas,and the development and implementation of ecosystem programs for proper research and collaboration in African arid and semi-arid zones,have been proposed as strategic recommendations to enhance the global partnership for sustainable ***,as the outcomes of the workshop,there are three steps proposed to handle African dryland climate changes,several aspects suggested to solve current dilemmas of the GGWI,and a series of actions recommended for G-DEP related activities

关键词： Africa Global Dryland ecosystem Programme(G-DEP) dryland ecosystem consultation Sustainable Development Goals Great Green Wall Initiative(GGWI)

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THE DIURNAL TRENDS OF SENSIBLE AND LATENT HEAT FLUXES OF A SUBTROPICAL EVERGREEN CONIFEROUS PLANTATION SUBJECTED TO SEASONAL DROUGHT

THE DIURNAL TRENDS OF SENSIBLE AND LATENT HEAT FLUXES OF A S...

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2010年亚洲通量网会议(Asiaflux workshop2010)

作者： Youwei He Qiubing Wang Xuefa Wen Jianlin Wang Xiaomin Sun Huimin Wang Qingdao Agricultural University Qingdao 266109China Shen yang Agricultural University Shen yang 110866China Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Shen yang Agricultural UniversityShen yang 110866China Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

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Species-specific phenological responses to long-term nitrogen fertilization in an alpine meadow

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Journal of Plant Ecology 2017年第2期10卷 301-309页

作者： Tan-Feng Yin Li-Li Zheng Guang-Min Cao Ming-Hua Song Fei-Hai Yu Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesA11Datun RoadChaoyang DistrictBeijing 100101China School of Nature Conservation Beijing Forestry University35 East Qinghua RoadHaidian DistrictBeijing 100083China University of Chinese Academy of Sciences No.19 Yuquan RoadBeijing 100039China Northwest Institute of Plateau Biology Chinese Academy of Sciences59 Xiguan DajieXining 810008China

Aims Long-term nitrogen(N)fertilization has profound impacts on com-munity structure and ecosystem function,but little is known about its effects on plant ***,no published study has examined effects of N chemical forms on plant *** in an alpine meadow on the Tibetan Plateau,we monitored reproductive phenology of six common plant species after 8 years of fertilization with different N chemical forms(addition of 7.5 g N m^(−2) yr^(−1) in the forms of ammonium,nitrate and ammonium nitrate),with no N addition as the *** Findings Eight years of N fertilization affected plant reproductive phenology,and such effects depended on the species,N form and phenological *** with ammonium generally delayed,advanced or did not change flowering and fruiting phases of the alpine ***,fertilization with ammonium affected the temporal dispersion of reproductive phenology among the six species,espe-cially among the late-flowering *** could reduce the overlap of flowering and fruiting and increase phenological *** with nitrate only delayed the senescence phase of Elymus nutans,and fertilization with ammonium nitrate did not affect reproductive phenology of the six alpine plants.N fertilization with any form increased the overlap in senescence among the six *** conclude that long-term N fertilization can cause shifts in plant phenology and such effects depend on N chemical *** results also suggest that phenological comple-mentarity could be a mechanism underlying resource partitioning and thus species coexistence in the face of changing N availability with different chemical forms.

关键词： reproductive phenology fertilization nitrogen forms temporal dispersion in phenology alpine meadow

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The role of herbivores in the grassland carbon budget for Three-Rivers Headwaters region,Qinghai-Tibetan Plateau,China

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Grassland Research 2022年第3期1卷 207-219页

作者： Junbang Wang Xinquan Zhao Xihuang Ouyang Liang Zhao Wenying Wang Chan Zuo Zhenhua Zhang Huakun Zhou Alan Watson Yingnian Li Key Laboratory of Ecosystem Network Observation and Modeling National Ecosystem Science Data CenterInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina State Key Laboratory of Plateau Ecology and Agriculture Qinghai UniversityXiningChina Qinghai Provincial Key Laboratory of Restoration Ecology for Cold Region Northwest Institute of Plateau BiologyChinese Academy of SciencesXiningChina University of Chinese Academy of Sciences BeijingChina College of Life Sciences Qinghai Normal UniversityXiningChina Rocky Mountain Research Station USDA Forest ServiceMissoulaMontanaUSA

Background:An accurate assessment of the carbon budget is a crucial part of projecting future climate change and its impact on *** foster multiple ecological functions including support for wild animals and *** intake forage biomass carbon,then digest and metabolize,and finally retain some *** carbon processes have not been well quantified,resulting in uncertainties in the estimation of regional carbon budgets for grassland ***:An animal metabolic carbon flux model was developed for herbivores in the Three-Rivers Headwaters region of *** forage intake and metabolic carbon rates were estimated through metabolic body weight and daily digested measures for the main herbivore ***:The carbon intake was 5.52 Tg C year−1(45%)from partial aboveground biomass(12.2 Tg C year−1),in which 39.31%was released into the atmosphere by respiration CO_(2),43.77%was returned to the ecosystem as feces and urine,and 16.96%was retained in herbivores for population regeneration or for human ***:This study,as the first research on this topic,quantified the carbon flux of herbivores and found livestock accounts for a major part of consumed carbon on grasslands,which is important for understanding regional carbon budgets to mitigate and adapt to climate change over grasslands worldwide.

关键词： aboveground biomass alpine grassland carbon budget herbivores livestock metabolism

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Potential influence of water level changes on energy flows in a lake food web

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Chinese Science Bulletin 2011年第26期56卷 2794-2802页

作者： WANG YuYu YU XiuBo LI WenHua XU Jun CHEN YuWei FAN Na Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Donghu Experimental Station of Lake Ecosystems State Key Laboratory of Freshwater Ecology and Biotechnology of China Institute of Hydro- biology Chinese Academy of Sciences Wuhan 430072 China Institute of Ecology Lund University Ecology Building SE-223 62 Lund Sweden Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China

Large seasonal water-level fluctuations may influence isotopic signatures of primary producers and the types and amounts of these potential food sources accessible to aquatic fauna of Poyang Lake,the largest freshwater lake in *** this study,the isotopic signatures of primary producers and consumers were determined,stable carbon and nitrogen isotope analysis and mixing models were combined to investigate the influence of water levels on the diet and isotopic composition of Poyang Lake fish and *** potential food sources (seston,benthic organic matter,aquatic macrophytes,attached algae,and terrestrial plants),4 species of invertebrates,and 10 species of fish were collected from the lake area during dry and wet seasons between January 2009 and April *** δ 13C values of invertebrates and most fish were within the range of δ 13C values of the potential food sources for both *** δ 13C values of invertebrates and most fish were lower in the dry season than in the wet season,whereas the δ 15N values exhibited different patterns for different *** models indicated that the most important food sources for common lake fauna were seston in the dry season and aquatic macrophytes and terrestrial plants in the wet *** fauna were more omnivorous in the wet season than in the dry *** food web dynamics of Poyang Lake are strongly influenced by changes in the abundance and accessibility of different basal food sources that occur because of seasonal flood *** trophic links within the aquatic communities of Poyang Lake are modified by water-level fluctuations.

关键词：水位变化食物网无脊椎动物食物来源同位素特征流量能量水生动物

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Sustainable wildlife protection on the Qingzang Plateau

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Geography and Sustainability 2021年第1期2卷 40-47页

作者： Yangjian Zhang Ran Zhao Yaojie Liu Ke Huang Juntao Zhu Lhasa station Key Laboratory of Ecosystem Network Observation and ModelingInstitute 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 100190China Peking University Shenzhen Graduate School Shenzhen 518055China

Besides its ecological services to China and even Asia,the Qingzang Plateau(QP)hosts a rich variety of wildlife *** the last century,wildlife population decreased quickly on the QP,driven by human ***,wildlife has witnessed rapid recovery mainly propelled by a series of wildlife conservation ***,some cautions merit attentions to sustain wildlife restoration and conservation on the *** paper casted an overview of environmental and social-economic changes on the QP affecting wildlife ***-sults show that QP has been warming,which can benefit wildlife recovery by easing extreme low temperature *** fast growing social economy across the QP lays a solid economic foundation for investing on wildlife *** such as establishing conservation areas,constructing wildlife pathway corridors,and en-couraging herdsman moving out from wildlife rich regions,have boosted wildlife ***,wildlife recovery is constrained by the limited carrying capacity of the ecosystem,left by domestic ***,fences intended to delineate conservation areas or to separate each type of grassland use,have brought about profound side effects on wildlife through fragmentation of their *** is recommended to set up the fence in a more ecological way,which can be achieved by bypassing the wildlife frequent pathway and using mate-rials devoid of steel *** considering both opportunities and problems simultaneously,can the wildlife protection on the QP be sustained.

关键词： Carrying capacity Conservation Climate Social-economy The Qingzang Plateau Wildlife

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Enhanced dominance of soil moisture stress on vegetation growth in Eurasian drylands

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National Science Review 2023年第8期10卷 135-147页

作者： Yu Zhang Yangjian Zhang Xu Lian Zhoutao Zheng Guang Zhao Tao Zhang Minjie Xu Ke Huang Ning Chen Ji Li Shilong Piao Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences College of Resources and Environment University of Chinese Academy of Sciences Sino-French Institute for Earth System Science College of Urban and Environmental Sciences Peking University Department of Earth and Environmental Engineering Columbia University College of Agronomy Shenyang Agricultural University Department of Geosciences and Natural Resource Management University of Copenhagen Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Department of Geography School of Geography and Information EngineeringChina University of Geosciences State Key Laboratory of Tibetan Plateau Earth System Resources and Environment Institute of Tibetan Plateau ResearchChinese Academy of Sciences

Despite the mounting attention being paid to vegetation growth and their driving forces for water-limited ecosystems, the relative contributions of atmospheric and soil moisture dryness stress on vegetation growth are an ongoing debate. Here we comprehensively compare the impacts of high vapor pressure deficit(VPD) and low soil water content(SWC) on vegetation growth in Eurasian drylands during 1982–*** analysis indicates a gradual decoupling between atmospheric dryness and soil dryness over this period,as the former has expanded faster than the latter. Moreover, the VPD–SWC relation and VPD–greenness relation are both non-linear, while the SWC–greenness relation is near-linear. The loosened coupling between VPD and SWC, the non-linear correlations among VPD–SWC-greenness and the expanded area extent in which SWC acts as the dominant stress factor all provide compelling evidence that SWC is a more influential stressor than VPD on vegetation growth in Eurasian drylands. In addition, a set of 11 Earth system models projected a continuously growing constraint of SWC stress on vegetation growth towards 2100. Our results are vital to dryland ecosystems management and drought mitigation in Eurasia.

关键词： soil water content vapor pressure deficit vegetation growth decoupling non-linear relation

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Surface water quality forecasting based on ANN and GIS for the Chanzhi Reservoir, China

Surface water quality forecasting based on ANN and GIS for t...

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International Conference on Information Science and Engineering (ICISE)

作者： Shuai Song Xilai Zheng Fadong Li Yucheng Comprehensive Experiment Station Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Key Laboratory of marine Environment & ecology ministry of education Ocean University of China Qingdao China Yucheng Comprehensive Experiment Station Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy and Sciences Beijing China

Artificial neural network (ANN) based on Arc Engine (AE) of GIS is used to predict surface water quality in the Chanzhi Reservoir, Qingdao, China. The results can reflect the water quality change trends with less than 10% average relative error. Using MS SQL Server database technology combined with Geodatabase, the system achieves the fundamental geographic information and hydrological data management, and water quality prediction. It uses GIS component technology to build an efficient and stable platform which can apply to general surface water quality prediction. This software has good information extraction and query functions to help decision-makers to manage water resource better.

关键词： Artificial neural networks Forecasting Monitoring Reservoirs Predictive models Data models

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Climate change reductions in lake ice cover duration and thickness help regulate the carbon sink potential of plateau type lakes

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National Science Open 2024年第5期3卷 114-129页

作者： Di Shen Yafeng Wang Junjie Jia Shuoyue Wang Kun Sun Yang Gao College of Earth and Environment Science Lanzhou UniversityLanzhou 730000China State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Lake ice changes in winter under the influence of global climate change,but how lake ice changes will regulate water gross primary productivity(GPP)and carbon sequestration capacity is still ***,we evaluated and analyzed the geographic spatial pattern and dynamic changes of lake ice and GPP on the Qinghai-Tibetan Plateau(QTP)in the past 20 *** show that lake ice duration on the QTP is 123.36±2.43 d on average,although longer for lakes at higher altitudes,of moderate size,and with shallower *** ice thickness is between 55-66 cm on average,and its GPP on the QTP is between 0.17-3.35 g C m^(-2)d^(-1).In the context of global climate change,reductions in lake ice cover duration and changes in ice thickness on the QTP increased phytoplankton GPP during the winter freeze period while decreasing Carbon dioxide(CO_(2))emissions during the melting period.

关键词： Qinghai-Tibetan Plateau lake ice gross primary productivity carbon sequestration

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Potential impacts of climate warming on active soil organic carbon contents along natural altitudinal forest transect of Changbai Mountain

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Acta Ecologica Sinica 2010年第2期30卷 113-117页

作者： Xin-Yu Zhang Xian-Jing Meng Lu-Peng Gao Xiao-Min Sun Jin-Juan Fan Li-Jun Xu The Sub-Center for Water Monitoring and Research Chinese Ecosystem Research Network Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Shenyang Agricultural University Shenyang 110161 China National Science and Technology Infrastructure Center Beijing 100862 China

Understanding soil carbon fractions and their responses to the global warming is important for improving soil carbon management of natural altitudinal forest ecosystem. In this study, the contents of soil total organic carbon (SOC), soil labile organic carbon (LOC), and microbial biomass carbon (MBC) in soil upper layers (0–20 cm) were measured along a natural altitudinal transect in the north slope of Changbai Mountain. The results showed that under natural conditions the contents of SOC and LOC were largest in Betula ermanii forest (altitude 1996 m), moderate in spruce-fir forest (altitude 1350 m), and smallest in Korean pine mixed broad-leaf tree forest (altitude 740 m). MBC contents in different forest ecosystems decreased in the order of Betula ermanii forest, Korean pine mixed broad-leaf tree forest, and dark coniferous forest. In addition, the responses of SOC, LOC, and MBC to soil warming were conducted by relocating intact soil cores from high- to low-elevation forests for one year. As expected, the soil core relocation caused significant increase in soil temperature but made no significant effect on soil moisture. After one year incubation, soil relocation significantly decreased SOC contents, whereas the contents of LOC, MBC, and the ratios of LOC to SOC and MBC to SOC increased.

关键词： Soil core relocation experiment Forest soil Soil total organic carbon (SOC) Soil labile organic carbon (LOC) Microbial biomass carbon (MBC)

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