Divergent driving mechanisms of community temporal stability in China's drylands  

作　　者：Kai Wang Cong Wang Bojie Fu Jianbei Huang Fangli Wei Xuejing Leng Xiaoming Feng Zongshan Li Wei Jiang 

机构地区：[1]State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing,100085,China [2]College of Resources and Environment,University of Chinese Academy of Sciences,Beijing,100049,China [3]Max Planck Institute for Biogeochemistry,Hans-Kn€oll-Str.10,07745,Jena,Germany [4]Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing,100101,China [5]Shaanxi Yan'an Forest Ecosystem National Observation and Research Station,Beijing,100085,China [6]National Observation and Research Station of Earth Critical Zone on the Loess Plateau in Shaanxi,Xi'an,710061,China

出　　处：《Environmental Science and Ecotechnology》2024年第4期237-246,共10页环境科学与生态技术（英文）

基　　金：funded by the National Natural Science Foundation and the National Key Research and Development Program of China(Grant No.41991233,2022YFF1300405,and 41807153);C.W.was supported by the Ma Shijun Young Talent Sponsorship Program by the State Key Laboratory of Urban and Regional Ecology.

摘　　要：Climate change and anthropogenic activities are reshaping dryland ecosystems globally at an unprecedented pace,jeopardizing their stability.The stability of these ecosystems is crucial for maintaining ecological balance and supporting local communities.Yet,the mechanisms governing their stability are poorly understood,largely due to the scarcity of comprehensive field data.Here we show the patterns of community temporal stability and its determinants across an aridity spectrum by integrating a transect survey across China's drylands with remote sensing.Our results revealed a U-shaped relationship between community temporal stability and aridity,with a pivotal shift occurring around an aridity level of 0.88.In less arid areas(aridity level below 0.88),enhanced precipitation and biodiversity were associated with increased community productivity and stability.Conversely,in more arid zones(aridity level above 0.88),elevated soil organic carbon and biodiversity were linked to greater fluctuations in community productivity and reduced stability.Our study identifies a critical aridity threshold that precipitates significant changes in community stability in China's drylands,underscoring the importance of distinct mechanisms driving ecosystem stability in varying aridity contexts.These insights are pivotal for developing informed ecosystem management and policy strategies tailored to the unique challenges of dryland conservation.

关 键 词：Dryland ecosystems Community stability Ecosystem management Species richness Aridity threshold 

分 类 号：X171.1[环境科学与工程—环境科学]