文献类型：期刊文献

英文题名：Extreme drought decreases soil heterotrophic respiration but not methane flux by modifying the abundance of soil microbial functional groups in alpine peatland

作者：Kang, Enze[1,2] Li, Yong[1,2] Zhang, Xiaodong[1,2] Yan, Zhongqing[1,2] Zhang, Wantong[3] Zhang, Kerou[1,2] Yan, Liang[1,2] Wu, Haidong[1,2] Li, Meng[1,2] Niu, Yuechuan[4] Yang, Ao[1,2] Wang, Jinzhi[1,2] Kang, Xiaoming[1,2]

第一作者：Kang, Enze

通信作者：Kang, XM[1]

机构：[1]Chinese Acad Forestry, Inst Wetland Res, Beijing Key Lab Wetland Serv & Restorat, Beijing 100091, Peoples R China;[2]Sichuan Zoige Wetland Ecosyst Res Stn, Aba 624500, Peoples R China;[3]Univ Chinese Acad Sci, Sino Danish Ctr Educ & Res, Beijing 100049, Peoples R China;[4]Univ Chinese Acad Sci, Coll Life Sci, Beijing 100049, Peoples R China

年份：2022

卷号：212

外文期刊名：CATENA

收录：;Scopus(收录号：2-s2.0-85123246066);WOS:【SCI-EXPANDED(收录号:WOS:000790442500001)】；

基金：Acknowledgments This work was supported by the National Natural Science Foundation of China (32171597, 42041005) , the Fundamental Research Funds of CAF (CAFYBB2020ZA004 and CAFYBB2019SY030) .

语种：英文

外文关键词：Soil heterotrophic respiration; Methane flux; Bacterial community; Functional groups; Alpine peatland; Random forest model

摘要：Extreme drought can have a substantial effect on the soil water content, soil microbial community structure and function, soil heterotrophic respiration (R-h), and soil methane (CH4) flux. However, the effects of extreme drought on R(h )and CH4 flux at different plant growth stages (rapid growth, full bloom, and decline stages) and the main factors driving changes in R-h and CH4 flux remain unclear. We conducted an experiment to reveal the responses of R-h, CH4 flux, and the microbial community to extreme drought and the main factors affecting R-h and CH4 flux. Extreme drought significantly decreased R-h (from 69.41 to 31.37 mg m(-2)h(-1)) at the decline stage but had no significant effect on CH4 flux. Extreme drought significantly decreased bacterial alpha-diversity, markedly decreased the relative abundance of Rokubacteria and Chloroflexi at the rapid growth stage and decline stage, and significantly increased the relative abundance of Actinobacteria at the full bloom stage. At the rapid growth and full bloom stages, extreme drought significantly decreased the relative abundance of aromatic hydrocarbon degraders by 50.26% and 64.37%, respectively. At the decline stage, extreme drought significantly decreased the relative abundance of methanol oxidizers and lignin degraders by 81.63% and 82.08%, respectively. A random forest model analysis revealed the most important role of bacterial functional groups in determing R-h and CH(4 )flux. The aromatic compound degraders and aromatic hydrocarbon degraders amounted to 11.89 % of contribution to R-h, and aromatic compound degraders, aromatic hydrocarbon degraders, aliphatic non-methane hy-drocarbon degraders, and methylotrophs amounted to 13.29 % of contribution to CH4 flux. Our findings indicate that microbial functional groups involved in carbon cycles are important factors explaining variation in R-h and CH4 flux and are critical for exploring the possible microbial response mechanism of soil carbon cycling under future scenarios of extreme drought.