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Impacts of Projected Climate Warming and Wetting on Soil Microbial Communities in Alpine Grassland Ecosystems of the Tibetan Plateau

文献类型： 外文期刊

作者： Zeng, Jun 1 ; Shen, Ju-Pei 1 ; Wang, Jun-Tao 1 ; Hu, Hang-Wei 4 ; Zhang, Cui-Jing 1 ; Bai, Ren 1 ; Zhang, Li-Mei 1 ; He, 1 ;

作者机构： 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China

2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China

3.Xinjiang Acad Agr Sci, Inst Appl Microbiol, Urumqi 830091, Peoples R China

4.Univ Melbourne, Fac Vet & Agr Sci, Parkville, Vic 3010, Australia

关键词： Climate change; Warming and wetting; Bacterial 16S rRNA; Nitrification; Denitrification; Alpine grassland

期刊名称：MICROBIAL ECOLOGY （ 影响因子：4.552； 五年影响因子：4.77 ）

ISSN： 0095-3628

年卷期： 2018 年 75 卷 4 期

页码：

收录情况： SCI

摘要： Climate change is projected to have impacts on precipitation and temperature regimes in drylands of high elevation regions, with especially large effects in the Qinghai-Tibetan Plateau. However, there was limited information about how the projected climate change will impact on the soil microbial community and their activity in the region. Here, we present results from a study conducted across 72 soil samples from 24 different sites along a temperature and precipitation gradient (substituted by aridity index ranging from 0.079 to 0.89) of the Plateau, to assess how changes in aridity affect the abundance, community composition, and diversity of bacteria, ammonia-oxidizers, and denitrifers (nirK/S and nosZ genes-containing communities) as well as nitrogen (N) turnover enzyme activities. We found V-shaped or inverted V-shaped relationships between the aridity index (AI) and soil microbial parameters (gene abundance, community structures, microbial diversity, and N turnover enzyme activities) with a threshold at AI = 0.27. The increasing or decreasing rates of the microbial parameters were higher in areas with AI < 0.27 (alpine steppes) than in mesic areas with 0.27 < AI < 0.89 (alpine meadow and swamp meadow). The results indicated that the projected warming and wetting have a strong impact on soil microbial communities in the alpine steppes.

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