文献类型：期刊文献

英文题名：Different responses of soil hydrolases and oxidases to extreme drought in an alpine peatland on the Qinghai-Tibet Plateau, China

作者：Yan, Zhongqing[1,2,3] Li, Yong[1,2,3] Wu, Haidong[1,2,3] Zhang, Kerou[1,2,3] Hao, Yanbin[4] Wang, Jinzhi[1,2,3] Zhang, Xiaodong[1,2,3] Yan, Liang[1,2,3] Kang, Xiaoming[1,2,3]

第一作者：Yan, Zhongqing;闫钟清

通信作者：Kang, XM[1]

机构：[1]Chinese Acad Forestry, Inst Wetland Res, Beijing 100091, Peoples R China;[2]Beijing Key Lab Wetland Serv & Restorat, Beijing 100091, Peoples R China;[3]Sichuan Zoige Wetland Ecosyst Res Stn, Tibetan Autonomous Prefe 624500, Peoples R China;[4]Univ Chinese Acad Sci, Beijing 100049, Peoples R China

年份：2020

卷号：99

外文期刊名：EUROPEAN JOURNAL OF SOIL BIOLOGY

收录：;Scopus(收录号：2-s2.0-85085543419);WOS:【SCI-EXPANDED(收录号:WOS:000552683000004)】；

基金：This study was financially supported by the National Nonprofit Institute Research Grant (CAFYBB2020ZA004, CAFYBB2019SY030 and CAFYBB2017QB009), the National Key Research and Development Program of China (2016YFC0501804), and the National Natural Science Foundation of China (41701113, 41877421 and 31770511). We thank the anonymous reviewers and editors for their valuable comments and suggestions on the manuscript.

语种：英文

外文关键词：Extracellular enzyme activities; Soil hydrolases; Soil oxidases; Extreme drought; Alpine peatland

摘要：Extracellular enzyme activities (EEA) in soils play a pivotal role in ecosystem processes, such as organic carbon (C) decomposition or nitrogen (N) and phosphorus (P) mineralization. Thus, EEA measurements can provide insights into the rates of ecosystem-level processes in peatlands, which will experience more frequent extreme droughts in the future. In the present study, the activities of seven hydrolases and two oxidases involved in the acquisition of C, N, and P were measured in response to simulated extreme drought events during the summer. The combined results of three consecutive years showed that the beta-1,4-glucosidase and beta-1,4-xylosidase involved in mediating labile-C decomposition increased by 102.63% and 100.63%, respectively. In contrast, the oxidases involved in mediating recalcitrant-C decomposition showed a non-significant decreasing trend, indicating that extreme drought significantly increased the decomposition of cellulose in peatlands. The C-acquisition enzyme, C:P -acquisition enzyme, and N:P-acquisition enzyme activities increased, on average, by 78.45%, 51.57%, and 36.57%, respectively, under extreme drought, impacting the rates of microbial growth and organic matter depolymerization. In addition, the results showed that changes in the C-acquisition enzyme were correlated with shifts in the soil water content, whereas soil oxidases were correlated with soil total C and N contents. Overall, the soil total C content explained 41.9% of the variation in EEA and ecoenzymatic stoichiometry. These results provide an improved understanding of hydrolase and oxidase activities in response to extreme drought events, thereby facilitating the prediction of long-term C dynamics in peatlands.