Effects of precipitation change and nitrogen addition on the composition, diversity, and molecular ecological network of soil bacterial communities in a desert steppe
文献类型： 外文期刊
作者： Jia, Meiqing 1 ; Gao, Zhiwei 2 ; Gu, Huijun 2 ; Zhao, Chenyu 4 ; Liu, Meiqi 2 ; Liu, Fanhui 2 ; Xie, Lina 2 ; Wang, Lichu 1 ;
作者机构： 1.Tianjin Normal Univ, Key Lab Water Resource & Environm, Tianjin, Peoples R China
2.Tianjin Normal Univ, Coll Life Sci, Tianjin, Peoples R China
3.Tianjin Normal Univ, Tianjin Key Lab Anim & Plant Resistance, Tianjin, Peoples R China
4.Univ Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Ibaraki, Japan
5.Jilin Acad Agr Sci, Inst Agr Environm & Resource, Changchun, Peoples R China
6.Tianjin Agr Ecol Environm Monitoring & Agr Prod Q, Tianjin, Peoples R China
7.Inner Mongolia Agr Univ, Coll Grassland Resources & Environm, Hohhot, Peoples R China
期刊名称：PLOS ONE （ 影响因子：2.74； 五年影响因子：3.226 ）
ISSN： 1932-6203
年卷期： 2021 年 16 卷 3 期
页码：
收录情况： SCI
摘要： Currently, the impact of changes in precipitation and increased nitrogen(N) deposition on ecosystems has become a global problem. In this study, we conducted a 8-year field experiment to evaluate the effects of interaction between N deposition and precipitation change on soil bacterial communities in a desert steppe using high-throughput sequencing technology. The results revealed that soil bacterial communities were sensitive to precipitation addition but were highly tolerant to precipitation reduction. Reduced precipitation enhanced the competitive interactions of soil bacteria and made the ecological network more stable. Nitrogen addition weakened the effect of water addition in terms of soil bacterial diversity and community stability, and did not have an interactive influence. Moreover, decreased precipitation and increased N deposition did not have a superimposed effect on soil bacterial communities in the desert steppe. Soil pH, moisture content, and NH4+-N and total carbon were significantly related to the structure of bacterial communities in the desert steppe. Based on network analysis and relative abundance, we identified Actinobacteria, Proteobacteria, Acidobacteria and Cyanobacteria members as the most important keystone bacteria that responded to precipitation changes and N deposition in the soil of the desert steppe. In summary, we comprehensively analyzed the responses of the soil bacterial community to precipitation changes and N deposition in a desert steppe, which provides a model for studying the effects of ecological factors on bacterial communities worldwide.
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