文献类型：期刊文献

英文题名：Environmental Controls on Multi-Scale Dynamics of Net Carbon Dioxide Exchange From an Alpine Peatland on the Eastern Qinghai-Tibet Plateau

作者：Yao, Hu Peng, Haijun Hong, Bing Guo, Qian Ding, Hanwei Hong, Yetang Zhu, Yongxuan Cai, Cheng Chi, Jinshu

第一作者：Yao, Hu

通信作者：Peng, HJ[1];Hong, B[1];Peng, HJ[2];Hong, B[2];Peng, HJ[3];Hong, B[3]

机构：[1]Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang, 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, Peoples R China;[4]CAS Ctr Excellence Quaternary Sci & Global Change, Xian, Peoples R China;[5]Guizhou Inst Technol, Sch Chem Engn, Guiyang, Peoples R China;[6]Swedish Univ Agr Sci, Dept Forest Ecol & Management, Umea, Sweden

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

通信机构：corresponding author), Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang, 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, Peoples R China.

年份：2022

卷号：12

外文期刊名：FRONTIERS IN PLANT SCIENCE

收录：;Scopus(收录号：2-s2.0-85123198034);WOS:【SCI-EXPANDED(收录号:WOS:000745768500001)】；

基金：This research was funded by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB40010300), the National Natural Science Foundation of China (Grant Nos. 41673119, 41773140, and 41907288), and the Science and Technology Foundation of Guizhou Province (Grant Nos. [2019]1317 and [2020]1Y193). HP would like to thank the Chinese Academy of Sciences' "Light of West China" Program and the CAS Scholarship for their financial support.

语种：英文

外文关键词：NEE; eddy covariance; alpine peatland; wavelet analysis; Qinghai-Tibetan Plateau

摘要：Peatlands are characterized by their large carbon storage capacity and play an essential role in the global carbon cycle. However, the future of the carbon stored in peatland ecosystems under a changing climate remains unclear. In this study, based on the eddy covariance technique, we investigated the net ecosystem CO2 exchange (NEE) and its controlling factors of the Hongyuan peatland, which is a part of the Ruoergai peatland on the eastern Qinghai-Tibet Plateau (QTP). Our results show that the Hongyuan alpine peatland was a CO2 sink with an annual NEE of -226.61 and -185.35 g C m(-2) in 2014 and 2015, respectively. While, the non-growing season NEE was 53.35 and 75.08 g C m(-2) in 2014 and 2015, suggesting that non-growing seasons carbon emissions should not be neglected. Clear diurnal variation in NEE was observed during the observation period, with the maximum CO2 uptake appearing at 12:30 (Beijing time, UTC+8). The Q(10) value of the non-growing season in 2014 and 2015 was significantly higher than that in the growing season, which suggested that the CO2 flux in the non-growing season was more sensitive to warming than that in the growing season. We investigated the multi-scale temporal variations in NEE during the growing season using wavelet analysis. On daily timescales, photosynthetically active radiation was the primary driver of NEE. Seasonal variation in NEE was mainly driven by soil temperature. The amount of precipitation was more responsible for annual variation of NEE. The increasing number of precipitation event was associated with increasing annual carbon uptake. This study highlights the need for continuous eddy covariance measurements and time series analysis approaches to deepen our understanding of the temporal variability in NEE and multi-scale correlation between NEE and environmental factors.