文献类型：期刊文献

英文题名：The intra- and inter-annual responses of soil respiration to climate extremes in a semiarid grassland

作者：Li, Linfeng[1,2] Qian, Ruyan[1] Wang, Weijin[2,3,4] Kang, Xiaoming[5,6,7] Ran, Qinwei[1] Zheng, Zhenzhen[1] Zhang, Biao[1] Xu, Cong[1] Che, Rongxiao[8] Dong, Junfu[1] Xu, Zhihong[2] Cui, Xiaoyong[1,9,10] Hao, Yanbin[1,9,10] Wang, Yanfen[1,9,10]

第一作者：Li, Linfeng

通信作者：Hao, YB[1]

机构：[1]Univ Chinese Acad Sci, Coll Life Sci, Beijing 100049, Peoples R China;[2]Griffith Univ, Sch Environm & Sci, Environm Futures Res Inst, Brisbane, Qld 4111, Australia;[3]Dept Environm & Sci, Brisbane, Qld 4102, Australia;[4]Univ Queensland, Sch Agr & Food Sci, Brisbane, Qld 4072, Australia;[5]Chinese Acad Forestry, Inst Wetland Res, Beijing 100091, Peoples R China;[6]Beijing Key Lab Wetland Serv & Restorat, Beijing 100091, Peoples R China;[7]Sichuan Zoige Wetland Ecosyst Res Stn, Tibetan Autonomous Prefe 624500, Peoples R China;[8]Yunnan Univ, Inst Int Rivers & Ecosecur, Kunming 650091, Yunnan, Peoples R China;[9]Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;[10]Chinese Acad Sci, Univ Chinese Acad Sci, Yanshan Earth Crit Zone & Surface Fluxes Res Stn, Beijing 10049, Peoples R China

年份：2020

卷号：378

外文期刊名：GEODERMA

收录：;EI(收录号：20203209008033);Scopus(收录号：2-s2.0-85088870346);WOS:【SCI-EXPANDED(收录号:WOS:000566654700006)】；

基金：This project was funded by the International Cooperation and Exchange of National Natural Science Foundation of China (Grant No. 31761123001, 31761143018). Great thanks for the help of the Inner Mongolia Grassland Ecosystem Research Station.

语种：英文

外文关键词：Carbon cycling; Drought; Heat wave; Respiration; Soil moisture; Timescale

摘要：Increasing frequency and magnitude of climate extremes could fundamentally affect terrestrial carbon (C) cycling. However, as the second-largest terrestrial C flux, soil respiration (SR) responses to climate extremes are not well understood. Here, we investigated the effects of drought, heat wave and drought plus heat wave on SR in a semiarid grassland during the growing season over 3 years. The results indicated that drought consistently reduced the growing-season mean SR, especially during the period of drought treatment, while heat wave, alone or when combined with drought, had little effect on SR. The decreased SR under drought at the intra-annual timescale could be primarily attributable to restriction of low soil moisture to microbial biomass, as there were no consistent changes in plant community (aboveground biomass, richness and abundance). In contrast, the inter-annual variation in SR was positively related to plant community abundance, richness and aboveground biomass in additional to soil water availability, but was not significantly affected by microbial biomass. Our study highlighted that incorporating microbial biomass in C cycling models can improve simulation of seasonal dynamics of soil respiration while incorporating plant community characteristics can benefit prediction of variation in SR across multiple years in semiarid grasslands.