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Mechanistic links between biodiversity effects on ecosystem functioning and stability in a multi-site grassland experiment
Journal of Ecology ( IF 5.5 ) Pub Date : 2021-06-08 , DOI: 10.1111/1365-2745.13725
Ying Yan 1 , John Connolly 2, 3, 4 , Maowei Liang 1 , Lin Jiang 5 , Shaopeng Wang 1
Affiliation  

  1. Although the positive effects of biodiversity on ecosystem functioning and stability have been extensively documented in the literature, previous studies have mostly explored the mechanisms of functioning and stability independently. It is unclear how biodiversity effects on functioning may covary with those on stability.
  2. Here we developed an integrated framework to explore links between mechanisms underlying biodiversity effects on functioning and those on stability. Specifically, biodiversity effects on ecosystem functioning were partitioned into complementarity effects (CE) and selection effects (SE), and those on stability were partitioned into species asynchrony and species stability. We investigated how CE and SE were linked to species asynchrony and stability and how their links might be mediated by species evenness, using a multi-site grassland experiment.
  3. Our mixed-effects models showed that a higher community productivity was mainly due to CE and a higher community stability was mainly due to species asynchrony. Moreover, CE was positively related to species asynchrony, thus leading to a positive association between ecosystem productivity and stability.
  4. We used a structural equation model to illustrate how species evenness might mediate links between the various mechanisms. Communities with a higher evenness exhibited a higher CE and species asynchrony, but a lower SE and species stability. These evenness-mediated associations enhanced the positive relationship between CE and species asynchrony, but blurred that between SE and species asynchrony.
  5. Synthesis. Our findings demonstrate mechanistic links between biodiversity effects on ecosystem functioning and stability. By doing so, our study contributes a novel framework for understanding ecological mechanisms of the functioning–stability relationship, which has important implications for developing management plans focused on strengthening synergies between ecosystem functioning and stability over the long term.


中文翻译:

多地点草地试验中生物多样性对生态系统功能和稳定性的影响之间的机制联系

  1. 虽然生物多样性对生态系统功能和稳定性的积极影响已在文献中得到广泛记录,但以往的研究大多是独立探索功能和稳定性的机制。目前尚不清楚生物多样性对功能的影响如何与对稳定性的影响共变。
  2. 在这里,我们开发了一个综合框架来探索生物多样性对功能和稳定性影响的机制之间的联系。具体而言,生物多样性对生态系统功能的影响分为互补效应(CE)和选择效应(SE),对稳定性的影响分为物种异步性和物种稳定性。我们使用多地点草地实验研究了CESE如何与物种不同步性和稳定性相关联,以及它们的联系如何由物种均匀度介导。
  3. 我们的混合效应模型表明,较高的群落生产力主要是由于CE,较高的群落稳定性主要是由于物种不同步。此外,CE与物种不同步性呈正相关,从而导致生态系统生产力和稳定性之间存在正相关。
  4. 我们使用结构方程模型来说明物种均匀度如何调节各种机制之间的联系。具有较高均匀度的群落表现出较高的CE和物种异步性,但较低的SE和物种稳定性。这些均匀度介导的关联增强了CE与物种异步之间的正相关关系,但模糊了SE与物种异步之间的正相关关系。
  5. 合成。我们的研究结果表明,生物多样性对生态系统功能和稳定性的影响之间存在机械联系。通过这样做,我们的研究为理解功能-稳定性关系的生态机制提供了一个新的框架,这对于制定侧重于加强生态系统功能和稳定性之间长期协同作用的管理计划具有重要意义。
更新日期:2021-06-08
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