The relative contribution of intraspecific variation and species turnover to the community-level foliar stoichiometric characteristics in different soil moisture and salinity habitats.
The relative contribution of intraspecific variation and species turnover to the community-level foliar stoichiometric characteristics in different soil moisture and salinity habitats.
复制标题
不同土壤水分和盐度生境中种内变异和物种更替对群落水平叶化学计量特征的相对贡献
DOI：
10.1371/journal.pone.0246672
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发表时间：
2021
期刊：
影响因子：
3.7
通讯作者：
Gong L
中科院分区：
文献类型：
--
作者：
Tusifujiang Y;Zhang X;Gong L
研究背景基于性状的方法已被用来证明植物功能性状对环境变化的反应可能表现在种间和/或种内。然而，如何社区水平的叶片化学计量特征的变化响应干旱和盐度仍然不为人所知。方法计算了旱地植物群落对高、低土壤水盐响应的C、N、P含量及其比值的群落加权平均值（CWM）和非加权平均值（CM）。基于平方和分解方法，我们确定了种内变异和物种周转在HSW和LSW生境的相对贡献。结果HSW生境中叶片C、C：N、C：P的CWM和N的CM均显著大于LSW生境。两种生境下的性状变异主要由种内变异驱动，且种内变异对性状变异的贡献随土壤水分和盐分的降低而降低。在两种生境中，与叶片碳相关的化学计量特征的CWM主要受物种周转的支配。此外，物种周转对C和C：P变化的贡献在LSW栖息地呈增加趋势。对于CWM，种内变异和营业额之间的负协变发生在HSW和正协变（除N：P）发生在LSW，但是，CMs在这两个栖息地一般呈正相关。结论随着干旱胁迫的加剧，荒漠植物种内变异逐渐减小，说明荒漠植物对干旱胁迫的适应性逐渐减弱。两种生境中碳相关性状的总变异主要受物种周转的影响。这些发现突出了种内变异在驱动荒漠植物群落功能组成对盐胁迫响应中的重要性，以及种内变异和物种更替在抵御干旱胁迫中的共同作用。
Background Trait-based approaches have been used to demonstrate the responses of plant functional traits to environmental change may manifest both among- and/or within-species. However, how community-level foliar stoichiometric characteristic variations respond to aridity and salinity is still not well-known. Methods We calculated community weighted means (CWMs) and non-weighted means (CMs) of foliar C, N, and P concentrations (and their ratios) in a dryland plant community respond to high (HSW) and low soil moisture and salinity (LSW). Based on a sum of squares decomposition method, we determined the relative contributions of intraspecific variation and species turnover in both HSW and LSW habitats. Results The CWMs of foliar C, C:N and C:P, and CM of N in the HSW habitat were significantly greater than those in the LSW habitat. The trait variations in two habitats were mainly driven by intraspecific variation, and its contribution to trait variation mostly declined with the decrease of soil moisture and salinity. The CWMs of foliar C-related stoichiometric characteristics were mainly dominated by species turnover in both habitats. Moreover, the contribution of species turnover to C and C:P variations showed an increasing trend in the LSW habitat. For CWMs, negative covariations between intraspecific variation and turnover occurred in HSW and positive covariations (except N:P) occurred in LSW; however, CMs were generally positively correlated in both habitats. Conclusions The intraspecific variation declined as drought stress intensified, which indicates that the adaptability of desert plants declined when the stress changed from salinity to aridity. The total variation of C-related traits in both habitats were mainly dominated by species turnover. These findings highlight the importance of intraspecific variation in driving desert plant response of community functional composition to salt stress, and the joint role of intraspecific variation and species turnover in resisting drought stress.
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