Abundance- and functional-based mechanisms of plant diversity loss with fertilization in the presence and absence of herbivores

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• 作者：Zhongling Yang ; Yann Hautier ; Elizabeth T. Borer ; Chunhui Zhang ; Guozhen Du
• 关键词：Alpine meadow ; Community composition ; Competition ; Functional traits ; Rare species
• 刊名：Oecologia
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：179
• 期：1
• 页码：261-270
• 全文大小：528 KB
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• 作者单位：Zhongling Yang (1) (2)
  Yann Hautier (3) (4)
  Elizabeth T. Borer (4)
  Chunhui Zhang (5)
  Guozhen Du (1)
  
  1. State Key Laboratory of Grassland Agroecosystems, Lanzhou University, Lanzhou, 730000, China
  2. State Key Laboratory of Cotton Biology, Key Laboratory of Plant Stress Biology, College of Life Sciences, Henan University, Kaifeng, 475004, Henan, China
  3. Department of Plant Sciences, University of Oxford, OX1 3RB, Oxford, UK
  4. Ecology and Biodiversity, Department of Biology, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands
  5. Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, 810008, Qinghai, China
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Plant Sciences
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1939

文摘

Nutrient supply and herbivores can regulate plant species composition, biodiversity and functioning of terrestrial ecosystems. Nutrient enrichment frequently increases plant productivity and decreases diversity while herbivores tend to maintain plant diversity in productive systems. However, the mechanisms by which nutrient enrichment and herbivores regulate plant diversity remain unclear. Abundance-based mechanisms propose that fertilization leads to the extinction of rare species due to random loss of individuals of all species. In contrast, functional-based mechanisms propose that species exclusion is based on functional traits which are disadvantageous under fertilized conditions. We tested mechanistic links between fertilization and diversity loss in the presence or absence of consumers using data from a 4-year fertilization and fencing experiment in an alpine meadow. We found that both abundance- and functional-based mechanisms simultaneously affected species loss in the absence of herbivores while only abundance-based mechanisms affected species loss in the presence of herbivores. Our results indicate that an abundance-based mechanism may consistently play a role in the loss of plant diversity with fertilization, and that diversity decline is driven primarily by the loss of rare species regardless of a plant’s functional traits and whether or not herbivores are present. Increasing efforts to conserve rare species in the context of ecosystem eutrophication is a central challenge for grazed grassland ecosystems. Keywords Alpine meadow Community composition Competition Functional traits Rare species