文献类型：期刊文献

英文题名：Effects of water table level and nitrogen deposition on methane and nitrous oxide emissions in an alpine peatland

作者：Zhang, Wantong[1,2,4] Hu, Zhengyi[2] Audet, Joachim[4] Davidson, Thomas A.[4] Kang, Enze[1,3] Kang, Xiaoming[1,3] Li, Yong[1,3] Zhang, Xiaodong[1,3] Wang, Jinzhi[1,3]

第一作者：Zhang, Wantong

通信作者：Wang, JZ[1];Wang, JZ[2]

机构：[1]Chinese Acad Forestry, Inst Wetland Res, Beijing Key Lab Wetland Serv & Restorat, Beijing 100091, Peoples R China;[2]Univ Chinese Acad Sci, Sino Danish Ctr Educ & Res, Beijing 100049, Peoples R China;[3]Sichuan Zoige Wetland Ecosyst Res Stn, Aba 624500, Tibetan, Peoples R China;[4]Aarhus Univ, Arctic Res Ctr ARC, Dept Ecosci, CF Mollers Alle, DK-8000 Aarhus, Denmark

年份：2022

卷号：19

期号：22

起止页码：5187-5197

外文期刊名：BIOGEOSCIENCES

收录：;Scopus(收录号：2-s2.0-85143382037);WOS:【SCI-EXPANDED(收录号:WOS:000886197700001)】；

基金：This research has been supported by the National Natural Science Foundation of China (grant nos. 41877421 and 31770511).

语种：英文

摘要：Alpine peatlands are recognized as a major natural contributor to the budgets of atmospheric methane (CH4) but as a weak nitrous oxide (N2O) source. Anthropogenic activities and climate change have put these fragile nitrogen (N)-limited peatlands under pressure by altering water table (WT) levels and enhancing N deposition. The response of greenhouse gas (GHG) emissions from these peatlands to these changes is uncertain. To address this knowledge gap, we conducted a mesocosm experiment in 2018 and 2019 investigating individual and interactive effects of three WT levels (WT-30, 30 cm below soil surface; WT0, 0 cm at the soil surface; WT10, 10 cm above soil surface) and multiple levels of N deposition (0, 20, 40, 80 and 160 kgNha(-1)yr(-1)) on growing season CH4 and N2O emissions in the Zoige alpine peatland, Qinghai-Tibetan Plateau. We found that the elevated WT levels increased CH4 emissions, while N deposition had nonlinear effects (with stimulation at moderate levels but inhibition at higher levels). In contrast no clear pattern of the effect of WT levels on the cumulative N2O emissions was evident, while N deposition led to a consistent and linear increase (emission factor: 2.3 %-2.8 %), and this was dependent on the WT levels. Given the current N deposition in the Zoige alpine peatland (1.08-17.81 kgNha(-1)), our results suggested that the CH4 and N2O emissions from the alpine peatlands could greatly increase in response to the possible doubling N deposition in the future. We believe that our results provide insights into how interactions between climate change and human disturbance will alter CH4 and N2O emissions from this globally important habitat.