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The Responses to Long-Term Water Addition of Soil Bacterial, Archaeal, and Fungal Communities in a Desert Ecosystem

文献类型： 外文期刊

作者： Gao, Ying 1 ; Xu, Xiaotian 1 ; Ding, Junjun 3 ; Bao, Fang 1 ; De Costa, Yashika G. 4 ; Zhuang, Weiqin 4 ; Wu, Bo 1 ;

作者机构： 1.Chinese Acad Forestry, Inst Desertificat Studies, Beijing 100091, Peoples R China

2.Beijing Acad Forestry & Pomol Sci, Beijing 100093, Peoples R China

3.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Key Lab Dryland Agr, Minist Agr, Beijing 100081, Peoples R China

4.Univ Auckland, Dept Civil & Environm Engn, Auckland 1023, New Zealand

关键词： global climate change; water addition; Illumina sequencing; desert; microbial community

期刊名称：MICROORGANISMS （ 影响因子：4.128； ）

ISSN：

年卷期： 2021 年 9 卷 5 期

页码：

收录情况： SCI

摘要： The response of microbial communities to continual and prolonged water exposure provides useful insight when facing global climate changes that cause increased and uneven precipitation and extreme rainfall events. In this study, we investigated an in situ manipulative experiment with four levels of water exposure (ambient precipitation +0%, +25%, +50%, and +100% of local annual mean precipitation) in a desert ecosystem of China. After 9 years of water addition, Illumina sequencing was used to analyze taxonomic compositions of the soil bacterial, archaeal, and fungal communities. The results showed significant increases in microbial biomass carbon (MBC) at higher amended precipitation levels, with the highest values reported at 100% precipitation. Furthermore, an increase in the bacterial species richness was observed along the water addition gradient. In addition, the relative abundance of several bacterial phyla, such as Proteobacteria, significantly increased, whereas that of some drought-tolerant taxa, including Actinobacteria, Firmicutes, and Bacteroidetes, decreased. In addition, the phyla Planctomycetes and Nitrospirae, associated with nitrification, positively responded to increased precipitation. Archaeal diversity significantly reduced under 100% treatment, with changes in the relative abundance of Thaumarchaeota and Euryarchaeota being the main contributors to shifts in the archaeal community. The fungal community composition was stable in response to water addition. Results from the Mantel test and structural equation models suggested that bacterial and archaeal communities reacted contrastingly to water addition. Bacterial community composition was directly affected by changing soil moisture and temperature, while archaeal community composition was indirectly affected by changing nitrogen availability. These findings highlight the importance of soil moisture and nitrogen in driving microbial responses to long-term precipitation changes in the desert ecosystem.

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