Plant compositional dynamics explain the destabilizing effect of eutrophication on grassland productivity

IF 6.3 1区 环境科学与生态学 Q1 ECOLOGY
Ningjie Ding, Jing Xia, Zhihui Yang, Chao Wang, Nie Zexu, Ji Suonan, Yonghui Wang, Yanhui Hou, Qingqing Chen, Josep Peñuelas, Jordi Sardans, Yann Hautier
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引用次数: 0

Abstract

Abstract Image

植物组成动态解释了富营养化对草地生产力的不稳定效应
生物多样性可以稳定生态系统的功能,但这种关系往往在养分富集等环境变化下被削弱。这种减弱的机制尚不清楚,特别是它是由持续促进群落动态的物种转移引起的,还是由物种更替增加引起的。随着时间的推移,持续存在的物种通过维持物种稳定性和异步动态来巩固稳定性,而以低时间占用为特征的瞬时物种主要有助于成分的更替,但稳定作用有限。因此,解开这两个群体的角色可以解释营养富集如何改变生物多样性-稳定性关系。利用施肥和不施肥的49个草地的数据,根据时间占用情况将群落划分为持久物种和短暂物种。利用结构方程模型量化了它们对群落时间稳定性的贡献,并评价了施肥对物种丰富度、物种不同步、物种稳定性和群落稳定性之间关系的影响。群落稳定性主要由持久物种驱动,稳定和非同步持久物种越多的群落表现出更高的时间稳定性。在不施肥条件下,物种丰富度与持久物种的稳定性和非同步性,以及持久物种和瞬时物种之间的非同步性呈正相关,这与较高的群落稳定性有关。在施肥条件下,这些途径被削弱,因为施肥降低了物种的持续稳定性和持续-短暂的不同步性,导致群落稳定性降低。在这两种情况下,瞬时物种对稳定性的贡献都不大,如果没有明确的解释,可能会模糊生物多样性与稳定性的关系。合成。这些结果表明,生物多样性-稳定性关系主要是由持续存在的物种介导的,这与理论预期一致,即稳定和异步种群动态产生不变性。养分的富集破坏了持久物种的稳定作用,而不是增加了瞬时物种的贡献,从而削弱了这些关系。因此,考虑物种的时间持久性为预测全球变化如何改变生态系统稳定性提供了机制基础。
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来源期刊
Journal of Ecology
Journal of Ecology 环境科学-生态学
CiteScore
10.90
自引率
5.50%
发文量
207
审稿时长
3.0 months
期刊介绍: Journal of Ecology publishes original research papers on all aspects of the ecology of plants (including algae), in both aquatic and terrestrial ecosystems. We do not publish papers concerned solely with cultivated plants and agricultural ecosystems. Studies of plant communities, populations or individual species are accepted, as well as studies of the interactions between plants and animals, fungi or bacteria, providing they focus on the ecology of the plants. We aim to bring important work using any ecological approach (including molecular techniques) to a wide international audience and therefore only publish papers with strong and ecological messages that advance our understanding of ecological principles.
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