Human activities uncouple the cascading effects of hydrological gradients on plant diversity and ecosystem functions in the Lake Dongting wetland
Human activities uncouple the cascading effects of hydrological gradients on plant diversity and ecosystem functions in the Lake Dongting wetland
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人类活动解耦水文梯度对洞庭湖湿地植物多样性和生态系统功能的级联效应
DOI：
10.1002/eco.2359
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发表时间：
2021-09
期刊：
影响因子：
2.6
通讯作者：
Jeppesen Erik
中科院分区：
文献类型：
--
作者：
Fu Hui;Wang Xiaoyan;Ge Dabing;Li Wei;Tan Xiaoyao;Yuan Guixiang;Jeppesen Erik
人类活动显著改变了植物群落的多样性格局及其对环境条件的反应，从而对生态系统功能产生了影响。对洞庭湖湿地127个样地的47种植物的11个主要功能性状进行了测定，并对植物群落的分类组成、功能组成和地上生物量(AGB)进行了评价。利用一个广义的多层路径模型，我们研究了两种不同的生境类型(短草地和以苔草为主的自然群落)中水文梯度对植物多样性和生态系统功能的级联效应。和高大草地，人工群落以白三叶和芦荟为主)。我们发现植物多样性和AGB对水文梯度的响应存在显著差异。高寒草地的物种丰富度、Shannon-Wiener多样性、多性状功能多样性度量(即功能丰富度、功能离散度和Rao‘s二次方差)和群落加权平均(CWM)均显著高于高寒草原，而块茎功能散度和CWM显著低于高寒草原。AGB在短草地上显著较高，这主要是由于功能多样性的变异而不是分类多样性的差异所致。此外，我们还发现，海拔和土壤水分对AGB有显著的级联效应，这是由短草原功能多样性的变化直接或间接引起的，而在高草原，海拔对AGB只有直接影响。因此，我们的研究提供了强有力的证据，证明人类引起的生境类型的变化与水文梯度对生态系统功能的级联效应是不耦合的，无论是分类学上的还是功能上的多样性。
Human activities markedly modify diversity patterns of plant communities and their response to environmental conditions, with subsequent consequences for ecosystem functions. We measured 11 key functional traits of 47 plant species and assessed both taxonomic and functional composition as well as above‐ground biomass (AGB) of plant communities from 127 plots in the Lake Dongting wetland. Using a generalized multilevel path model, we examined the cascading effects of hydrological gradients on plant diversity and ecosystem functions in two distinct habitat types (short grassland with a natural community dominated by Carex spp. and tall grassland with a managed artificial community dominated by Triarrhena lutarioriparia and Phragmites australis). We found significant differences in the response of plant diversity and AGB to hydrological gradients. Species richness, Shannon–Wiener diversity, multiple‐trait functional diversity measures (i.e., functional richness, functional dispersion & Rao's quadratic entropy) and community‐weighted mean (CWM) of shoot height were all significantly higher and functional divergence and CWM of tuber significantly lower in tall grassland. AGB was significantly higher in short grassland, largely driven by variations of functional diversity rather than of taxonomic diversity. Moreover, we found a significant cascading effect of elevation and soil moisture on AGB, directly or indirectly induced by changes in functional diversity in the short grassland, while only direct effects of elevation on AGB were observed in the tall grassland. Therefore, our study provides strong evidence that human‐induced changes in habitat types uncoupled the cascading effects of hydrological gradients on ecosystem functions mediated by either the taxonomic or the functional diversity.
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影响因子：
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作者：
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通讯作者：
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作者：
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影响因子：
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作者：
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