文献类型：期刊文献

英文题名：Seasonal and diurnal variation in ecosystem respiration and environmental controls from an alpine wetland in arid northwest China

作者：Yao, Hu Peng, Haijun Hong, Bing Ding, Hanwei Hong, Yetang Zhu, Yongxuan Wang, Jie Cai, Cheng

第一作者：Yao, Hu

通信作者：Hong, B[1];Hong, B[2];Hong, B[3]

机构：[1]Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China;[2]Chinese Flux Observat & Res Network, Bayinbuluk Alpine Wetland Carbon Flux Res Stn, Beijing, Peoples R China;[3]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[4]CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China;[5]Guizhou Inst Technol, Sch Chem Engn, Guiyang 550055, Peoples R China

第一机构：Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China

通信机构：corresponding author), Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China;corresponding author), Chinese Flux Observat & Res Network, Bayinbuluk Alpine Wetland Carbon Flux Res Stn, Beijing, Peoples R China;corresponding author), CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China.

年份：2022

卷号：15

期号：5

起止页码：933-946

外文期刊名：JOURNAL OF PLANT ECOLOGY

收录：;Scopus(收录号：2-s2.0-85152567331);WOS:【SCI-EXPANDED(收录号:WOS:000860845700001)】；

基金：This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB40010300), the National Natural Science Foundation of China (41907288, 41673119 and 41773140) and the Science and Technology Foundation of Guizhou Province ([2019]1317 and [2020]1Y193) and the Opening Fund of the State Key Laboratory of Environmental Geochemistry (SKLEG2021214).

语种：英文

外文关键词：alpine wetland; ecosystem respiration; environmental factors; automatic chamber; Q (10)

摘要：Wetlands store large amounts of carbon stocks and are essential in both global carbon cycling and regional ecosystem services. Understanding the dynamics of wetland carbon exchange is crucial for assessing carbon budgets and predicting their future evolution. Although many studies have been conducted on the effects of climate change on the ecosystem carbon cycle, little is known regarding carbon emissions from the alpine wetlands in arid northwest China. In this study, we used an automatic chamber system (LI-8100A) to measure ecosystem respiration (ER) in the Bayinbuluk alpine wetland in northwest China. The ER showed a significant bimodal diurnal variation, with peak values appearing at 16:30 and 23:30 (Beijing time, UTC + 8). A clear seasonal pattern in ER was observed, with the highest value (19.38 mu mol m(-2) s(-1)) occurring in August and the lowest value (0.11 mu mol m(-2) s(-1)) occurring in late December. The annual ER in 2018 was 678 g C m(-2) and respiration during the non-growing season accounted for 13% of the annual sum. Nonlinear regression revealed that soil temperature at 5 cm depth and soil water content (SWC) were the main factors controlling the seasonal variation in ER. The diurnal variation in ER was mainly controlled by air temperature and solar radiation. Higher temperature sensitivity (Q(10)) occurred under conditions of lower soil temperatures and medium SWC (25% <= SWC <= 40%). The present study deepens our understanding of CO2 emissions in alpine wetland ecosystems and helps evaluate the carbon budget in alpine wetlands in arid regions.