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Species turnover drives grassland community to phylogenetic clustering over long-term grazing disturbance

文献类型： 外文期刊

作者： Zhu, Juntao 1 ; Zhang, Yangjian 1 ; Wang, Wenfeng 5 ; Yang, Xian 2 ; Chen, Ning 1 ; Shen, Ruonan 1 ; Wang, Li 6 ; Jiang, 1 ;

作者机构： 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Lhasa Plateau Ecosyst Res Stn, Beijing 100101, Peoples R China

2.Georgia Inst Technol, Sch Biol Sci, Atlanta, GA 30332 USA

3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China

4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China

5.Tibet Acad Agr & Anim Husb Sci, Lhasa 850032, Peoples R China

6.Peking Univ, Shenzhen Grad Sch, Shenzhen 518000, Peoples R China

关键词： alpine grassland; grazing; phylogenetic diversity; phylogenetic community structure; species richness

期刊名称：JOURNAL OF PLANT ECOLOGY （ 影响因子：1.774； 五年影响因子：2.547 ）

ISSN： 1752-9921

年卷期： 2020 年 13 卷 2 期

页码：

收录情况： SCI

摘要： Aims Grazing exerts profound effects on grassland ecosystem service and functions by regulating species composition and diversity, and structuring community assembly worldwide. However, adaptions of phylogenetic diversity and phylogenetic community structure to long-term grazing disturbance remain poorly studied, especially for ecosystems distributed in extreme environments. Methods Here, we conducted an experiment with multigrazing intensities to explore the impacts of grazing disturbance on plant phylogenetic diversity and community structure in an alpine grassland of the Tibetan Plateau. Important Findings Grazing disturbance enriched plant species richness (SR), and stimulated species turnover from regional species pool, consequently changing community species composition. Under low intensities, grazing exerted no obvious effects on phylogenetic diversity and community structure, whereas communities changed from overdispersion to clustering under high grazing intensity. High grazing intensity resulted in stronger environmental filtering, which consequently selected those species with high resilience to grazing disturbance. The observed clustering structure was associated with the colonizing species which were closely related to resident species, and locally extinct species, and distantly related to residents. At the plant functional trait level, high grazing intensity increased species colonization largely by altering the effect of root depth on species colonization compared to light grazing. Our results highlight that solely utilization of SR and diversity cannot fully represent grassland communities responses to grazing. The effects of species turnover on community phylogenetic diversity and structure are entailed to be explored in the future grazing studies.

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