Effects of drought stress on soil bacteriall community in the West foot of Daxing’an Mountains

¹ School of Life Science, Inner Mongolia University, China；Key Laboratory of Herbage & Endemic Crop Biotechnology, Ministry of Education, China
² Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences/ Inner Mongolia Conservation Tillage Engineering Technology Research Center/ Inner Mongolia Key Laboratory of Degradation Farmland Ecological Restoration and Pollution Control, China
³ Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences Corn Research Institute, China

^* Corresponding author: lzhy281@163.com; zhaoxq204@163.com.

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.