Synergies between microsites of plant communities and steady-stage alpine meadows on the Qinghai-Tibetan Plateau  

作　　者：Li Lin Xingliang Xu Guangmin Cao Fawei Zhang Yikang Li Bo Fan Qian Li Junjie Huang 

机构地区：[1]Qinghai Haibei National Field Research Station of Alpine Grassland Ecosystem and Key Laboratory of Adaptation and Evolution of Plateau Biota,Northwest Institute of Plateau Biology,Chinese Academy of Sciences,Xining,China [2]Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing,China [3]School of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo,China

出　　处：《Grassland Research》2023年第4期289-298,共10页草地研究（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Number:U20A2006;Youth Project of Qinghai Province,Grant/Award Number:2023-ZJ-967Q Abstract。

摘　　要：Background:Due to the effects of climate change and overgrazing in recent decades,alternative stable states in the alpine Kobresia meadow degradation process have coexisted in the same geographical and climatic environment,with variations occurring among microsites.Methods:We used a space-for-time substitution approach to explore the synergies of microsite variation according to its numerical characteristics and the proportion of each stable state at various stages of succession in alpine Kobresia meadows on the Qinghai-Tibetan Plateau.Results:(1)The highest average aboveground biomass in summer was 196.2±20.3 gm^(-2),with significantly higher levels of biomass in≤3.65 sheep unit ha^(-1) than in other levels of grazing intensity,while the parameters showed no significant differences among grazing intensity levels in>3.65 sheep unit ha^(-1).(2)The importance of plant functional groups,aboveground biomass,and niche breadth of Poaceae and Cyperaceae significantly decreased as the grazing intensity increased.(3)The effects of≥0°C accumulated temperature,total precipitation,altitude,longitude,and latitude cumulatively contributed less than 20%of the variation in the distribution of functional group characteristics across microsites.Conclusions:(1)Overgrazing decreases primary production in alpine Kobresia meadows,but ecosystem responses regulate plant community structure and botanical components so as to partially counteract grazing disturbance.(2)Overgrazing changed the proportion of microsites,which in turn led to regime shift in the plant community and subsequent synergies between the microsites of plant communities and their stable states.

关 键 词：alpine ecosystem degradation alternative stable state MICROSITE OVERGRAZING SUCCESSION 

分 类 号：S812[农业科学—草业科学] Q948[农业科学—畜牧学]