Nitrogen enrichment and warming shift community functional composition via distinct mechanisms: The role of intraspecific trait variability and species turnover
Nitrogen enrichment and warming shift community functional composition via distinct mechanisms: The role of intraspecific trait variability and species turnover
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氮富集和变暖通过不同的机制改变群落功能组成：种内性状变异和物种更替的作用
DOI：
10.1111/1365-2435.14012
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发表时间：
2022-01
影响因子：
5.2
通讯作者：
Hui Guo
中科院分区：
文献类型：
--
作者：
Xiaoyi Wang;Xuebin Yan;Kailing Huang;Xi Luo;Yuanyuan Zhang;Luyao Zhou;Fei Yang;Xiaohong Xu;Xianhui Zhou;Kechang Niu;Hui Guo
全球变化因素可能会改变社区的功能组成，推动物种周转（物种的出现和物种的相对丰度）和种内性状的变异。然而，它们在决定群落功能对全球变化，特别是氮富集和变暖的反应的相对贡献，仍然不清楚。我们进行了一个完全析因的田间试验，在西藏高寒草甸植物群落功能组成的反应，氮富集和变暖的量化在每个小区的7个植物功能性状。利用平方和分解，我们进一步揭示了种内性状变异和物种更替对群落功能组成变化的相对贡献。我们发现，富氮导致植物群落向资源获取型策略转变，而变暖导致植物群落向资源保守型策略转变。植物种内性状变异控制着群落功能组成响应氮富集的变化，而物种周转（特别是物种相对丰度的变化）主要解释了变暖引起的变化。增氮和增温对高寒草甸植物功能组成没有显著的交互作用，表明增氮和增温通过不同的机制改变高寒草甸植物功能组成。植物种内性状变异赋予了西藏高山草甸在氮富集条件下的功能恢复力，但变暖可能导致物种的显著更替，这明显影响了这一高原生态系统中的群落功能。
Global change factors may shift community functional composition by driving species turnover (species occurrence and species relative abundance) and intraspecific trait variability. However, their relative contribution in determining the functional response of community to global change, especially nitrogen enrichment and warming, remains unclear.We conducted a fully factorial field experiment in a Tibetan alpine meadow to examine the responses of plant community functional composition to nitrogen enrichment and warming by quantifying seven plant functional traits in each plot. Using the sum of squares decomposition, we further disentangled the relative contribution of intraspecific trait variability and species turnover to changes in community functional composition.We found that nitrogen enrichment caused a shift of plant community towards a more resource‐acquisitive strategy, while warming resulted in a shift towards a more resource‐conservative strategy. Plant intraspecific trait variability controls shifts in community functional composition in response to nitrogen enrichment, whereas species turnover (especially change in species relative abundance) mainly explains warming‐induced shifts. Nitrogen enrichment and warming did not show significant interactive effects on plant functional composition.These findings suggest that nitrogen enrichment and warming can alter community functional composition of alpine meadow through distinct mechanisms. Plant intraspecific trait variability confers functional resilience of Tibetan alpine meadows under nitrogen enrichment, but warming could induce significant turnover of species that pronouncedly impacts community functioning in this highland ecosystem.Read the free Plain Language Summary for this article on the Journal blog.