数字农科院2.0

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

文献类型： 外文期刊

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

作者机构：

关键词： biomass stability;dominant species;drought;functional stability;species asynchrony;structural stability

期刊名称： SCIENCE CHINA-LIFE SCIENCES

ISSN： 1674-7305

年卷期： 2023 年

页码：

收录情况： SCIE（2023版） ; ; CSCD（2023-2024年度） ; ; 科技核心（2023版）

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.

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