Effects of warming and precipitation changes on the structure and function of soil bacterial communities in dry-crop farmland
TIAN Rui1, KOU Jin1, HU Xiao1, ZHANG Peng1, LEI Jun2, WANG He-ling2, LYU Xiao-dong1,3
1. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; 2. Key Laboratory of Arid Climate Change and Disaster Reduction in Gansu Province, Lanzhou Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China; 3. Observation Station of Subalpine Ecology Systems in the Middle Qilian Mountains, Zhangye 73400, China
Abstract：In this study, Six treatments were established:a control (CK), warming (W), increased precipitation (+P30), decreased precipitation(-P30), increased warming and precipitation (W+P30), and increased warming and decreased precipitation (W-P30). Field experiments were conducted to investigate the effects of warming and precipitation changes on the structure and function of soil bacterial communities in dry-crop farmland. Macro-genome sequencing was exployed to examine the composition, diversity, network structure and metabolic function characteristics of soil bacterial communities under varying treatments. The results demonstrated that the W and W+P30 treatments significantly elevated the relative abundance of Alphaproteobacteria, while the W+P30 treatment notably increased the relative abundance of unclassified Chloroflexi. Conversely, the W, +P30, W+P30, and W-P30 treatments significantly reduced the relative abundance of unclassified Actinomycetia. The +P30 treatment resulted in a significant increase in the Shannon, Simpson and Pielou indices, whereas the W-P30 treatment led to a significant reduction in the alpha diversity index of bacteria. Significant differences were observed in the effects of warming, precipitation changes and their interactions on the β-diversity of the bacterial community. The W, +P30, W+P30 and W-P30 treatments exhibited higher complexity and connectivity than the CK treatment. However, the -P30 treatment exhibited lower relevant parameters than CK. The W, -P30 and W+P30 treatments demonstrated an increase in the number of connectivity nodes, whereas the +P30 and W-P30 treatments did not exhibit this increase. The W treatment led to a notable increase in the relative abundance of the circulatory system, while the +P30 treatment resulted in a significantly decreased the relative abundance of xenobiotics biodegradation and metabolism. The -P30 treatment led to a considerable decrease in the relative abundance of the excretory system, and the W+P30 treatment caused a notable decrease in the relative abundance of nucleotide metabolism. It was observed that warming, precipitation changes (either an increase or decrease in precipitation) and their interaction had significant impact on the structure and metabolic functions of soil bacterial in wheat fields.
田瑞, 寇谨, 胡啸, 张鹏, 雷俊, 王鹤龄, 吕晓东. 增温和降水变化对旱作农田土壤细菌群落结构和功能的影响[J]. 中国环境科学, 2025, 45(1): 508-518.
TIAN Rui, KOU Jin, HU Xiao, ZHANG Peng, LEI Jun, WANG He-ling, LYU Xiao-dong. Effects of warming and precipitation changes on the structure and function of soil bacterial communities in dry-crop farmland. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(1): 508-518.
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