Abstract
Global warming poses a serious threat to agriculture and natural systems, in part because of the change of soil moisture content, which changes soil microbial communities and ecological processes. Soil water content is the main factor limiting the growth of plants in soil. Microbial communities rely on soil water to complete their activities, and reveal the changes of underground microbial communities under different soil moisture content, which will help us to further understand the potential impact of climate change on soil ecosystem. To investigate the soil bacterial community structure, we established experiment indoor in the West foot of Daxing’an Mountains with manipulative water content treatments consisting of 20%, 15%, 10%, 5%, 0%. Results showed that bacterial community composition varied significantly with altered drought stress , but community richness did not. The relative abundance of Actinobacteria increased with the increase of drought stress, Proteobacteria, Acidobacteria and Gemmatimonadota decreased with the increase of drought stress, actinobacteria was more likely to accumulate or maintain stable under drought stress, bacterial communities can responding directly to changes in soil moisture.
Highlights
Global climate change may have considerable impacts on hydrological cycles worldwide, which may result in increased precipitation, higher evaporation rates, and the uneven distribution of rainfall[1]
Actinobacterial could play an important role in nitrogen fixation, Bacillus and Pseudomonas can form endospores under drought stress, thereby resisting the variation caused by altered precipitation regimes[14], the phylogenetic shifts in the composition of soil microbial communities are correlated with community function [15,16]
The significance analysis of the top 27 genera (Relative aboundance>1%) with relative abundance showed that soil water content had a significant effect on 16 genera, and 16 genera belonged to 6 different phylum, which 8 belonged to Actinobacteria, 3 belonged to Proteobacteria, 2 belonged to Acidobacteria, gemmatimonadota and bacteroidota only have 1 respectively(Table.2)
Summary
Global climate change may have considerable impacts on hydrological cycles worldwide, which may result in increased precipitation, higher evaporation rates, and the uneven distribution of rainfall[1]. Uncovering the effect of drought stress on the microbial community composition in the Western foot of Daxing'an Mountains will considerably enhance our understanding of the potential impact of climate change on arid ecosystems and their functions. Soil microorganisms are active factors in the soil ecosystem They play an important role in soil formation and development, soil organic matter decomposition, material and energy input, nutrient conversion, and fertility evolution. Actinobacterial could play an important role in nitrogen fixation, Bacillus and Pseudomonas can form endospores under drought stress, thereby resisting the variation caused by altered precipitation regimes[14], the phylogenetic shifts in the composition of soil microbial communities are correlated with community function [15,16]. The main aim is to determine the effects of the drought stress increased on soil bacteriall communities and potential functions, to explore the direct effect of water content on soil microbial community
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