Edge effects and spatial degradation process in highly fragmented grassland – impact on soil microbial community
Edge effects and spatial degradation process in highly fragmented grassland – impact on soil microbial community
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高度破碎化草地的边缘效应和空间退化过程——对土壤微生物群落的影响
DOI：
10.1016/j.ecolind.2021.108307
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发表时间：
2021-12
影响因子：
6.9
通讯作者：
Li Z.
中科院分区：
文献类型：
--
作者：
Zhao X.;Song Y.;Xu T.;Xu M.;Cai J.;Wang L.;Li Z.
斑块退化是草地退化的一个典型特征。土壤微生物在陆地生态系统中发挥着重要的作用，但土壤微生物群落组成和丰富度对斑块退化过程的响应却知之甚少。此外，在非退化斑块和退化斑块之间总是存在一个植被过渡区（即生态交错带），但生态交错带土壤微生物群落的特征尚不清楚。以中国北方典型退化草地为研究对象，研究了退化草地土壤微生物组成和丰富度的空间格局。结果表明，在斑块状降解过程中，土壤细菌和真菌的丰富度呈现出明显的差异。从未退化到退化斑块，细菌丰富度增加，而真菌丰富度降低。值得注意的是，土壤细菌具有显着的边缘效应，其特征是更丰富的细菌类群在生态交错带相比，非退化和退化的补丁，这是由于释放的竞争，从较低的优势门放线菌丰度。此外，在斑块状降解过程中，细菌和真菌的稀有类群的相对丰度持续下降，表明生态系统功能的降低。土壤微生物稀有类群的相对丰度可以作为草地退化的一个很好的生态指标。本研究揭示了草原斑块退化过程中土壤微生物群落的空间格局和生态交错带的微生物特征，为深入理解草原退化过程的机理提供了重要依据，也为制定草原恢复策略提供了理论依据。
Patchy degradation is a typical characteristic of grassland degradation. However, little is known about the responses of soil microbial community composition and richness to patchy degradation process, although soil microbes play important roles in the functioning of terrestrial ecosystems. Further, there is always a transitional area of vegetation between non-degraded and degraded patches (i.e. ecotone), but the characteristics of soil microbial communities at ecotone are not well understood. Here, we investigated spatial patterns of soil microbial composition and richness from non-degraded to degraded patch in a patchy degraded grassland of Northern China. The results showed that bacterial and fungal richness had contrast patterns during patchy degradation process. Bacterial richness increased while fungal richness decreased from non-degraded to degraded patch. Notably, soil bacteria had significant edge effects, characterized by more abundant bacterial taxa at ecotone compared with non-degraded and degraded patches, which was attributable to the release of competition from the lower dominant phylum-Actinobacteriaabundance. Moreover, the relative abundance of rare taxa for bacteria and fungi consistently decreased during patchy degradation process, indicating a reduction of ecosystem function. Relative abundance of soil microbial rare taxa could be a good ecological indicator in responding to grassland degradation. Overall, our study revealed the spatial patterns of soil microbial community during patchy degradation process and the microbial characteristics at ecotone, which is crucial for mechanistic understanding of grassland degradation process, and also providing a theoretical basis for the development of grassland restoration strategy.
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影响因子：
9.8
作者：
Mouillot D;Bellwood DR;Baraloto C;Chave J;Galzin R;Harmelin-Vivien M;Kulbicki M;Lavergne S;Lavorel S;Mouquet N;Paine CE;Renaud J;Thuiller W
通讯作者：
Thuiller W
影响因子：
64.8
作者：
Kéfi, Sonia;Rietkerk, Max;de Ruiter, Peter C.
通讯作者：
de Ruiter, Peter C.
影响因子：
2.9
作者：
César Valenzuela-Encinas;I. Neria-González;R. Alcántara-Hernández;I. Estrada-Alvarado;F. J. Zavala-Díaz de la Serna;L. Dendooven;R. Marsch
通讯作者：
César Valenzuela-Encinas;I. Neria-González;R. Alcántara-Hernández;I. Estrada-Alvarado;F. J. Zavala-Díaz de la Serna;L. Dendooven;R. Marsch
影响因子：
5
作者：
Jimenez, Diego Javier;Korenblum, Elisa;van Elsas, Jan Dirk
通讯作者：
van Elsas, Jan Dirk
DOI：
10.1073/pnas.95.25.14839
发表时间：
1998-12-08
影响因子：
11.1
作者：
Allen, CD;Breshears, DD
通讯作者：
Breshears, DD