Large herbivores increase the proportion of palatable species rather than unpalatable species in the plant community  

作　　者：Yu Li Shikui Dong Qingzhu Gao Yong Zhang Hasbagan Ganjurjav Guozheng Hu Xuexia Wang Yulong Yan Fengcai He Fangyan Cheng 

机构地区：[1]School of Public Administration,Chongqing Technology and Business University,Chongqing 400067,China [2]School of Grassland Science,Beijing Forestry University,Beijing 100083,China [3]Department of Natural Resources,Cornell University,Ithaca,NY 14853-3001,USA [4]Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100081,China [5]National Plateau Wetlands Research Center,College of Wetlands,Southwest Forestry University,Kunming 650224,China [6]Beijing Academy of Agricultural and Forestry Sciences,Beijing 100097,China [7]China New Era Group Corporation,Beijing 100082,China [8]State Key Laboratory of Subtropical Silviculture,Zhejiang A&F University,Hangzhou 311300,China

出　　处：《Journal of Integrative Agriculture》2025年第3期859-870,共12页农业科学学报(英文版)

基　　金：financially supported by grants from the National Natural Science Foundation of China(32101315 and 32101326);the National Key R&D Program of China(2021YFE0112400);the Second Tibetan Plateau Scientific Expedition and Research Program,China(2019QZKK0307);the HighLevel Talent Research Start-Up Project of Chongqing Technology and Business University,China(950319097);the Scientific and Technological Research Program of Chongqing Municipal Education Commission,China(KJQN202100827)。

摘　　要：When the dominant species in a plant community are palatable,many believe that large herbivores will reduce the dominant species and promote the proportion of previously suppressed species.However,this view may not always hold true.We conducted a 4-year yak grazing experiment on the Qinghai-Tibet Plateau and tracked the plant compositions of the rotational grazing(RG)and grazing exclusion(GE)grasslands during the four years.The results showed that in the absence of yaks under GE,the plant community was dominated by two palatable species,Kobresia pygmaea and Stipa capillata,due to their small leaf area and rapid growth strategy.The presence of yaks under RG significantly inhibited S.capillata and over half of the forbs,while the proportion of K.pygmaea increased and it became the absolute dominant species,contradicting the view that large herbivores inhibit palatable species.Interannually,the dominance of K.pygmaea under RG decreased in the dry year,leading to an increase in the dominance of the other eight species.Under GE,the dominance of K.pygmaea declined notably in the dry year,while S.capillata and seven other forbs increased substantially.Overall,these results suggest that K.pygmaea is grazing-tolerant but not drought-tolerant,whereas the other eight species are drought-tolerant but not grazingtolerant.At the community level,community composition shifts resulting from succession after grazing exclusion exceeded those caused by drought,drought tends to induce community species turnover while grazing tends to induce species abundance variations.In summary,our conclusions remind ranch managers that when considering the impact of livestock on plant community composition,they should factor in local conditions and climate change rather than simply assuming that livestock will suppress the palatable species.

关 键 词：GRAZING drought community composition SUCCESSION Qinghai-Tibet Plateau 

分 类 号：S81[农业科学—畜牧学]