Nitrogen addition and mowing alter drought resistance and recovery of grassland communities  

作　　者：Zhuwen Xu Heyong Liu Yani Meng Jinfei Yin Haiyan Ren Mai-He Li Shan Yang Shiming Tang Yong Jiang Lin Jiang 

机构地区：[1]Key Laboratory of Grassland Ecology,School of Ecology and Environment,Inner Mongolia University,Hohhot,010021,China [2]Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang,110016,China [3]School of Biological Sciences,Georgia Institute of Technology,Atlanta,30332,USA [4]Autonomous Region Collaborative Innovation Center for Integrated Management of Water Resources and Water Environment in the Inner Mongolia Reaches of the Yellow River,Hohhot,010018,China [5]Key Laboratory of Grassland Resources,College of Grassland,Resources and Environment,Inner Mongolia Agricultural University,Hohhot,010018,China [6]Swiss Federal Institute for Forest,Snow and Landscape Research WSL,Birmensdorf,CH-8903,Switzerland [7]Key Laboratory for Model Innovation in Forage Production Efficiency,Ministry of Agriculture and Rural Affairs,Institute of Grassland Research,Chinese Academy of Agricultural Sciences,Hohhot,010010,China [8]School of Life Sciences,Hebei University,Baoding,071002,China

出　　处：《Science China(Life Sciences)》2023年第7期1682-1692,共11页中国科学（生命科学英文版）

基　　金：supported by the National Natural Science Foundation of China(32060284,31870441);the Natural Science Foundation of Inner Mongolia,China(2019JQ04);the Central Government Guides the Local Science and Technology Development Foundation(2020ZY0027);the National Science Foundation of the United States(DEB-1856318,CBET-1833988);the Natural Science Foundation of Hebei Province(C2022201042)。

摘　　要：Nitrogen enrichment and land use are known to influence various ecosystems,but how these anthropogenic changes influence community and ecosystem responses to disturbance remains poorly understood.Here we investigated the effects of increased nitrogen input and mowing on the resistance and recovery of temperate semiarid grassland experiencing a three-year drought.Nitrogen addition increased grassland biomass recovery but decreased structural recovery after drought,whereas annual mowing increased grassland biomass recovery and structural recovery but reduced structural resistance to drought.The treatment effects on community biomass/structural resistance and recovery were largely modulated by the stability of the dominant species and asynchronous dynamics among species,and the community biomass resistance and recovery were also greatly driven by the stability of grasses.Community biomass resistance/recovery in response to drought was positively associated with its corresponding structural stability.Our study provides important experimental evidence that both nitrogen addition and mowing could substantially change grassland stability in both functional and structural aspects.Our findings emphasize the need to study changes across levels of ecological organization for a more complete understanding of ecosystem responses to disturbances under widespread environmental changes.

关 键 词：biomass stability dominant species DROUGHT functional stability species asynchrony structural stability 

分 类 号：S812[农业科学—草业科学]