文献类型：期刊文献

英文题名：Reduced Carbon Dioxide Sink and Methane Source under Extreme Drought Condition in an Alpine Peatland

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

第一作者：Kang, Xiaoming;康晓明

通信作者：Li, Y[1];Wang, JZ[1];Li, Y[2];Wang, JZ[2];Li, Y[3];Wang, JZ[3]

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, Aba 624500, Tibetan Autonom, Peoples R China;[4]Univ Chinese Acad Sci, Beijing 100049, Peoples R China

年份：2018

卷号：10

期号：11

外文期刊名：SUSTAINABILITY

收录：;Scopus(收录号：2-s2.0-85056788417);WOS:【SSCI(收录号:WOS:000451531700459)，SCI-EXPANDED(收录号:WOS:000451531700459)】；

基金：This research was funded by [the National Key Research and Development Program of China] grant number [2016YFC0501804], by [the National Nonprofit Institute Research Grant], grant number [CAFYBB2017QB009], and by [the National Natural Science Foundation of China], grant number [41701113], [41877421] and [31770511].

语种：英文

外文关键词：extreme drought; alpine peatland; carbon budget; controlled experiment

摘要：Potential changes in both the intensity and frequency of extreme drought events are vital aspects of regional climate change that can alter the distribution and dynamics of water availability and subsequently affect carbon cycles at the ecosystem level. The effects of extreme drought events on the carbon budget of peatland in the Zoige plateau and its response mechanisms were studied using an in-field controlled experimental method. The results indicated that the peatland ecosystem of the Zoige plateau functioned as a carbon sink while under the control (CK) or extreme drought (D) treatment throughout the entire growing season. Maximum fluxes of methane (CH4) emissions and the weakest carbon sink activity from this ecosystem were in the early growth stage, the most powerful carbon sink activity was during the peak growth stage, while the absorption sink activity of carbon dioxide (CO2) and CH4 was present during the senescence stage. Extreme drought reduced the gross primary productivity (GPP) and ecosystem respiration (R-e) of the peatland ecosystem by 14.5% and 12.6%, respectively (p < 0.05) and the net ability to store carbon was reduced by 11.3%. Overall, the GPP was highly sensitive to extreme drought. Moreover, extreme drought significantly reduced the CH4 fluxes of the ecosystem and even changed the peatland from a CH4 emission source to a CH4 sink. Subsequent to drought treatment, extreme drought was also shown to have a carry-over effect on the carbon budget of this ecosystem. Soil water content and soil temperature were the main driving factors of carbon budget change in the peatland of the Zoige plateau, but with the increase in soil depth, these driving forces were decreased. The findings indicated that frequent extreme drought events in the future might reduce the net carbon sink function of peatland areas, with an especially strong influence on CO2.