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Water sources for typical desert vegetation in the Ebinur Lake basin

Journal of Geographical Sciences 2022年第6期32卷 1103-1118页

作者： HAO Shuai LI Fadong College of Geographic Science and Tourism Xinjiang Normal UniversityUrumqi 830054China Key Laboratory of Xinjiang Uygur Autonomous Region Xinjiang Laboratory of Lake Environment and Resources in Arid AreaUrumqi 830054China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China College of Resource and Environment University of Chinese Academy of SciencesBeijing 100190China

In arid and semi-arid environments,desert vegetation plays an important role in preventing soil erosion by wind and helps maintain the stability of desert and oasis *** types of typical desert vegetation,namely Populus euphratica,Haloxylon ammodendron,Nitraria sibirica,and Halostachs caspica,corresponding to different habitats(i.e.,river bank,sand dune,desert,and salt marsh)were chosen as the model vegetation in this ***δ^(2)H andδ^(18)O for rainwater,soil water,and plant water were applied to identify the water sources and quantify the proportions of different water sources used over the entire plant growth period(from March to October).The results showed that the precipitationδ^(2)H andδ^(18)O in the Ebinur Lake basin varied from-142.5‰to-0.6‰and from-20.16‰to 1.20‰,*** largestδ^(2)H andδ^(18)O values occurred in summer and the smallest in *** soil waterδ^(2)H andδ^(18)O of the four habitats decreased gradually with increasing ***δ^(2)H andδ^(18)O values of water extracted from the stems of the four plants had similar variation trends,that is,the maximum was observed in spring and the minimum in *** the four plants,*** had the highest stable isotopic values in the stem water,followed by ***,***,and *** water sources and utilization ratios of desert vegetation varied across different growth *** the growing period,*** mainly used groundwater,whereas the water source proportions used by *** varied greatly throughout the growing *** spring,plants mainly relied on surface soil water,with a contribution rate of 80%-94%.However,in summer,the proportion of deep soil water used was 31%-36%;and in autumn,the proportion of middle soil water used was 33%-36%.*** mainly relied on topsoil water in spring and autumn,and the proportion of soil water in the middle layer slightly increased to 20%-36%in *** mainly used intermediate so

关键词： desert vegetation water use stable isotopes of hydrogen and oxygen Ebinur Lake basin

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Mechanism of plant-soil feedback in a degraded alpine grassland on the Tibetan Plateau

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Journal of Plant Ecology 2024年第2期17卷 188-199页

作者： Tiancai Zhou Jian Sun Peili Shi Key Laboratory of Ecosystem Network Observation and Modelling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China State Key Laboratory of Tibetan Plateau Earth System Resources and EnvironmentInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Biodiversity and Environment on the Qinghai-Tibet Plateau Ministry of EducationLhasa 850011China Tibet Research Academy of Eco-environmental Sciences Lhasa 850000China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Although biotic and abiotic factors have been confirmed to be critical factors that affect community dynamics,their interactive effects have yet to be fully considered in grassland ***,we tested how soil nutrients and microbes regulated plant-soil feedback(PSF)in a degraded alpine *** results indicated that soil total carbon(STC;from 17.66 to 12.55 g/kg)and total nitrogen(STN;from 3.16 to 2.74 g/kg)exhibited significant(P<0.05)decrease from non-degraded(ND)to severely degraded(SD).Despite higher nutrients in ND soil generating significantly(P<0.05)positive PSF(0.52)on monocots growth when the soil was sterilized,a high proportion of pathogens(36%)in ND non-sterilized soil resulted in a strong negative PSF on *** contrast,the higher phenotypic plasticity of dicots coupled with a higher abundance of mutualists and saprophytes(70%)strongly promoted their survival and growth in SD with infertile *** findings identified a novel mechanism that there was a functional group shift from monocots with higher vulnerability to soil pathogens in the ND fertile soil to dicots with higher dependence on nutritional mutualists in the degraded infertile *** emerging irreversible eco-evolutionary in PSF after degradation might cause a predicament for the restoration of degraded grassland.

关键词： plant-soil feedback plant function groups degradation alpine grassland Tibetan Plateau

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Flood variability in the upper Yangtze River over the last millennium——Insights from a comparison of climate-hydrological model simulated and reconstruction

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Science China Earth Sciences 2023年第3期66卷 547-567页

作者： Ran HUO Hua CHEN Lu LI Chong-Yu XU Jingjing LI Si HONG Chesheng ZHAN Jun XIA State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China Hubei Provincial Key Lab of Water System Science for Sponge City Construction Wuhan UniversityWuhan 430072China NORCE Norwegian Research Centre Bjerknes Centre for Climate ResearchJahnebakken 55007 BergenNorway Department of Geosciences University of OsloP.O Box 1047 Blindern0316 OsloNorway Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Water Cycle and Related and Surface Processes Chinese Academy of SciencesBeijing 100101China

Understanding hydrological responses to rising levels of greenhouse gases are essential for climate and impact *** is,however,often limited by a lack of long record of observational data to provide a basis for understanding the longterm behavior of the climate *** reconstructed data and(global climate and hydrological)model simulations will help us to better understand the variability of climate and hydrology over timescales ranging from decades to *** this study,we proposed an integrated approach to study flood variability in the upper reach of the Yangtze River over the last millennium to the end of the 21st *** accomplish this,we first drove hydrological models using the precipitation and temperature from four Global Climate Models(GCM),BCC-CSM1.1,MIROC,MRI-CGCM3,and CCSM4,to simulate daily discharge for the upper reach of the Yangtze River during the period of the last millennium(850–1849),historical period(1850–2005),and a future period(2006–2099).Then,we evaluated whether the modeled precipitation,temperature,and extreme discharge had statistical properties similar to those shown in the documented dry-wet periods,temperature anomalies,and paleoflood ***,we explored the extreme discharge variability using model *** results indicate that:(1)The MIROC-ESM model,differing from the other three GCM models,revealed positive temperature changes from the warm period(Medieval Climate Anomaly;MCA)to the cold period(Little Ice Age;LIA),while the temperature variability of the other models was similar to the records.(2)The BCC-CSM1.1 model performed better than the others regarding correlations between modeled precipitation and documented dry-wet periods.(3)Over most of the subbasins in the upper Yangtze River,the magnitude of extreme discharge in the BCC-CSM1.1 model results showed that there was a decrease from the MCA to the LIA period and an increase in the historical period relative to the cold period,whil

关键词： Climate change Flood variability Paleoflood records Climate-hydrological model Upper Yangtze River

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Divergent effects of climate change on cropland ecosystem water use efficiency at different elevations in southwestern China

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Journal of Geographical Sciences 2022年第8期32卷 1601-1614页

作者： TAO Jian ZHU Juntao ZHANG Yangjian DONG Jinwei ZHANG Xianzhou School of Public Administratio n Shand ong Tech no logy and Business UniversityYantai 264005ShandongChina Nagqu Alpine Grassland Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China

Understanding climatic effects on cropland water use efficiency at different elevations is imperative for managing agricultural water and production in response to ongoing climate change in climate-sensitive areas with complex topography, such as southwestern China. We investigated climatic effects on cropland water use efficiency in southwestern China at each 100-m elevation bin during 2001–2017. The maximum water use efficiency was 1.71 gC kg^(–1) H_2O for the 1900–1999 m elevation bin under the growing season temperature and precipitation of 14.58±0.32℃ and 965.40±136.45 mm, respectively. The water use efficiency slopes were dominated by the evapotranspiration slopes at elevations below 1999 m but were controlled by the gross primary productivity slopes at elevations above 2000 m. This difference was caused by the substantial responses of evaporation to climate change at lower elevations and the increased climatic sensitivity of gross primary productivity at higher elevations. In comparison to those at other elevations, croplands at lower elevations were more vulnerable to extreme drought because of the dominant role fluctuating evapotranspiration played in water use efficiency. The findings will improve cropland water management in the study area.

关键词： cropland water use efficiency southwestern China elevational gradient

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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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Status and path of intergenerational transmission of poverty in rural China:A human capital investment perspective

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Journal of Integrative Agriculture 2021年第4期20卷 1080-1091页

作者： BAI Yun-li ZHANG Lin-xiu SUN Ming-xing XU Xiang-bo Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101P.R.China UN Environment Programme-International Ecosystem Management Partnership Beijing 100101P.R.China

This paper focused on the intergenerational transmission of poverty in rural China by estimating the intergenerational transmission of earnings and stated its mechanism from the perspective of human capital investment before children participated in the labor *** data used in this study were longitude data collected in 2000 households of 100 villages among 25 counties across five provinces in 2005,2008,2012,2016,and *** and quantitative methods were *** found a significant intergenerational transmission of earnings in rural China,especially for the pairs of father–children and parents–*** intergenerational earnings'elasticities were much less than those in urban areas,which indicated better social mobility in rural areas than that in urban *** children with parents who could earn much were more likely to be invested before they participated in the labor market,gain a high education and have more *** cases further showed that the mechanism of human capital investment in children breaking the intergenerational transmission of poverty and promoting social mobility.

关键词： poverty intergenerational transmission human capital rural China

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Plant use of water across soil depths regulates species dominance under nitrogen addition

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Plant Diversity 2025年第3期47卷 479-488页

作者： Huang, Fu-Qiang Peñuelas, Josep Sardans, Jordi Collins, Scott L. Yu, Kai-Liang Liu, Man-Qiong Pei, Jiu-Ying Ke, Wen-Bin Ye, Jian-Sheng State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems College of Ecology Lanzhou University Lanzhou 730000 China CSIC Global Ecology Unit CREAF-CSIC-UAB Barcelona 08193 Spain CREAF Cerdanyola del Vallès Barcelona 08193 Spain Department of Biology University of New Mexico Albuquerque 87131 NM United States Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China

The primary mechanism driving plant species loss after nitrogen (N) addition has been often hypothesized to be asymmetric competition for light, resulting from increased aboveground biomass. However, it is largely unknown whether plants’ access to soil water at different depths would affect their responses, fate, and community composition under nitrogen addition. In a semiarid grassland exposed to 8-years of N addition, we measured plant aboveground biomass and diversity under four nitrogen addition rates (0, 4, 10, and 16 g m⁻² year⁻¹), and evaluated plant use of water across the soil profile using oxygen isotope. Aboveground biomass increased significantly, but diversity and shallow soil-water content decreased, with increasing rate of nitrogen addition. The water isotopic signature for both plant and soil water at the high N rate indicated that Leymus secalinus (a perennial grass) absorbed 7% more water from the subsurface soil layer (20–100 cm) compared to Elymus dahuricus (a perennial grass) and Artemisia annua (an annual forb). L. secalinus thus had a significantly larger biomass and was more abundant than the other two species at the high N rate but did not differ significantly from the other two species under ambient and the low N rate. Species that could use water from deeper soil layers became dominant when water in the shallow layers was insufficient to meet the demands of increased aboveground plant biomass. Our study highlights the importance of water across soil depths as key driver of plant growth and dominance in grasslands under N addition. © 2025 Kunming Institute of Botany, Chinese Academy of Sciences

关键词： Grassland Nitrogen enrichment Oxygen isotope Soil moisture Species richness

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An empirical approach to predict regional organic carbon in deep soils

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Science China Earth Sciences 2023年第3期66卷 583-593页

作者： Jingjing WANG Xiaorong WEI Xiaoxu JIA Mingbin HUANG Zhipeng LIU Yufei YAO Ming’an SHAO State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityYangling 712100China Institute of Soil and Water Conservation Ministry of Water Resources and Chinese Academy of SciencesYangling 712100China CAS Center for Excellence in Quaternary Science and Global Change Xi’an 710061China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China College of Urban and Environmental Sciences Northwest UniversityXi’an 710127China

Deep soil organic carbon(SOC)plays an important role in carbon *** predicting deep SOC at the regional scale is crucial for the accurate assessment of carbon sequestration potential in soils but has been challenging for a ***,we developed a depth distribution function-based empirical approach to predict SOC in deep soils at the regional *** validated this approach with a dataset from four regions of the world and examined the application of this approach in China’s Loess *** found that among the reported depth distribution functions describing vertical patterns of SOC,the negative exponential function performed best in fitting SOC along the soil profile in various ***,the parameters(i.e.,Ceand k)of the negative exponential function were linearly correlated to surface SOC(0–20 cm)and the changing rates of SOC within the topsoil(0–40 cm).Based on the above relationships,the empirical equations for predicting the negative exponential parameters are *** validation results from site-specific and regional dataset showed that combining the negative exponential function and such empirical equations can precisely predict SOC concentration in soils down to 500 cm *** study provides a simple,rapid and accurate method for predicting deep soil SOC at the regional scale,which could simplify the assessment of deep soil SOC in various regions.

关键词： Deep SOC Empirical approach Negative exponential function Depth distribution Spatial pattern

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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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Variation and adaptation in leaf sulfur content across China

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Journal of Plant Ecology 2022年第4期15卷 743-755页

作者： Wenzong Zhao Chunwang Xiao Mingxu Li Li Xu Nianpeng He College of Life and Environmental Sciences Minzu University of ChinaBeijing 100081China 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 10049China Center for Ecological Research Northeast Forestry UniversityHarbin 150040China

Sulfur is an essential functional element in leaves,and it plays important roles in regulating plant growth,development and abiotic stress resistance in natural ***,there has been limited information on the spatial variation in leaf sulfur content(LSC)and adaptive characters on a large community *** in leaves of 2207 plant species from 80 widespread ecosystems(31 forests,38 grasslands and 11 deserts)in China was ***-way analysis of variance with Duncan’s multiple-range tests were used to evaluate the differences in LSC among different plant growth forms and *** fitted the relationships of LSC to spatial and climate factors using *** equation modeling analysis and phylogenetic analysis helped us further explore the main factors of LSC *** ranged from 0.15 to 48.64 g·kg^(-1),with an average of 2.13±0.04 g·kg^(-1) at the community scale in *** observed significant spatial variation in LSC among different ecosystems and ***,LSC was higher in arid areas and ***,higher LSC was observed under environments of drought,low temperatures and intense ultraviolet ***,precipitation,radiation,soil sulfur content and aridity jointly regulated LSC,explaining 79%of the spatial ***,LSC was not significantly related to *** results demonstrate that LSC plays an important role in plant adaptations to extreme environments and further extend our understanding of the biological function of sulfur from the organ to the community *** findings highlight the importance of sulfur metabolism for our understanding of the impact of global climate change on plants.

关键词： functional trait functional element leaf sulfur content plant growth forms spatial variation China

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