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Plant functional diversity modulates global environmental change effects on grassland productivity
Journal of Ecology ( IF 5.3 ) Pub Date : 2018-03-12 , DOI: 10.1111/1365-2745.12951 Zhuwen Xu 1, 2 , Mai-He Li 1, 3 , Niklaus E. Zimmermann 3 , Shao-Peng Li 2 , Hui Li 1 , Haiyan Ren 4 , Hao Sun 1 , Xingguo Han 1, 5 , Yong Jiang 1 , Lin Jiang 2
中文翻译：
植物功能多样性调节全球环境变化对草地生产力的影响
更新日期：2018-03-12
Journal of Ecology ( IF 5.3 ) Pub Date : 2018-03-12 , DOI: 10.1111/1365-2745.12951 Zhuwen Xu 1, 2 , Mai-He Li 1, 3 , Niklaus E. Zimmermann 3 , Shao-Peng Li 2 , Hui Li 1 , Haiyan Ren 4 , Hao Sun 1 , Xingguo Han 1, 5 , Yong Jiang 1 , Lin Jiang 2
Affiliation
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- Although much research has explored changes in ecosystem functions associated with global environmental changes, the mechanistic pathways behind the observed changes remain poorly understood.
- Using an 11‐year experiment that increased growing season precipitation and nitrogen deposition in a temperate steppe, we explored the relative importance of direct and indirect environmental change effects on plant primary productivity.
- We show that increases in water and nitrogen availability influenced plant productivity via both direct and indirect pathways. While both treatments stimulated plant productivity, changes in plant productivity cannot be explained by observed changes in species or phylogenetic diversity. Instead, the indirect effects of water and nitrogen addition were through their positive effects on plant functional diversity. Importantly, while the increase in one component of functional diversity (community‐level weighted mean of plant stature) resulted in increased productivity, the increase in another component of functional diversity (functional dispersion) resulted in decreased productivity.
- Synthesis. Our study provides the first evidence for the opposite effects of community‐weighted means and functional dispersion of plant functional traits on grassland productivity and highlights the importance of both traits of dominant species and trait distribution among species in modulating the effects of global changes on ecosystem functions.
中文翻译：
植物功能多样性调节全球环境变化对草地生产力的影响
- 尽管许多研究已经探索了与全球环境变化相关的生态系统功能的变化，但是对所观察到的变化背后的机制途径仍然知之甚少。
- 通过一项为期11年的试验，该试验增加了温带草原生长季的降水和氮沉降，我们探索了直接和间接环境变化对植物初级生产力的相对重要性。
- 我们表明，水和氮的可利用性的增加通过直接和间接途径影响了植物的生产力。虽然两种处理均能刺激植物的生产力，但无法通过观察到的物种或系统发育多样性的变化来解释植物生产力的变化。相反，水和氮的间接影响是通过它们对植物功能多样性的积极影响。重要的是，虽然功能多样性的一个组成部分（社区身材加权平均水平）的增加导致了生产力的提高，但功能多样性的另一个组成部分（功能性分散）的增加却导致了生产力的下降。
- 综合。我们的研究为社区加权平均值和植物功能性状的功能分散对草地生产力的相反影响提供了第一个证据，并强调了优势物种的性状和物种之间的分布对调节全球变化对生态系统功能的影响的重要性。
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