文献类型：期刊文献

英文题名：Extreme rainfall impacts on soil CO2 efflux in an urban forest ecosystem in Beijing, China

作者：Chen, Wenjing[1,2,3] Jia, Xin[2,3,4] Li, Chunyi[5] Yu, Haiqun[6] Xie, Jing[2,7] Wang, Ben[2,4] Wu, Yajuan[2,3] Wang, Shan[2,3]

第一作者：Chen, Wenjing

通信作者：Jia, X[1];Jia, X[2];Jia, X[3]

机构：[1]Beijing Forestry Univ, Sch Forestry, Beijing 100083, Peoples R China;[2]Beijing Forestry Univ, Sch Soil & Water Conservat, Beijing 100083, Peoples R China;[3]Beijing Forestry Univ, State Forestry Adm Soil & Water Conservat, Key Lab, Beijing 100083, Peoples R China;[4]Univ Eastern Finland, Sch Forest Sci, Fac Sci & Forestry, Joensuu 80101, Finland;[5]Chinese Acad Forestry, Inst Wetland Res, Beijing 100091, Peoples R China;[6]Beijing Forestry Carbon Sequestrat Adm, Beijing 100083, Peoples R China;[7]Beijing Forestry Carbon Sequestrat Adm, Beijing 100083, Peoples R China

年份：2016

卷号：96

期号：4

起止页码：504-514

外文期刊名：CANADIAN JOURNAL OF SOIL SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000388098500016)】；

基金：This research was supported by China Postdoctoral Science Foundation funded project (2016M591092), the National Natural Science Foundation of China (NSFC; 31361130340, 31270755), and the Fundamental Research Funds for the Central Universities (No: 2015ZCQ-SB-02). This work is related to the ongoing Finnish-Chinese research collaboration project EXTREME, between Beijing Forestry University (BJFU) and University of Eastern Finland (UEF). This work was also promoted by the U.S.-China Carbon Consortium (USCCC). We thank Dr. H. Li for providing help comments and suggestions on the manuscript in terms of both science and language. We thank C. Ren, P. Liu, and J.Y. Ma for their assistance with field measurements and instrument maintenance.

语种：英文

外文关键词：extreme rainfall; gross primary production; soil respiration

摘要：Extreme rainfall events are infrequent disturbances that affect urban environments and soil respiration (Rs). Using data measured in an urban forest ecosystem in Beijing, China, we examined the link between gross primary production (GPP) and soil respiration on a diurnal scale during an extreme rainfall event (i.e., the "21 July 2012 event"), and we examined diel and seasonal environmental controls on Rs. Over the seasonal cycle, Rs increased exponentially with soil temperature (Ts). In addition, Rs was hyperbolically related to soil volumetric water content (VWC), increasing with VWC below a threshold of 0.17 m(3) m(-3), and then decreasing with further increases in VWC. Following the extreme rainfall event (177 mm), Rs showed an abrupt decrease and then maintained a low value of similar to 0.3 mu mol m(-2) s(-1) for about 8 h as soil VWC reached the field capacity (0.34 m(3) m(-3)). Rs became decoupled from Ts and increased very slowly, while GPP showed a greater increase. A bivariate Q(10)-hyperbolical model, which incorporates both Ts and VWC effects, better fits Rs than the Q(10) model in summer but not for whole year.