文献类型：期刊文献

英文题名：Annual ecosystem respiration variability of alpine peatland on the eastern Qinghai-Tibet Plateau and its controlling factors

作者：Peng, Haijun Hong, Bing Hong, Yetang Zhu, Yongxuan Cai, Chen Yuan, Lingui Wang, Yu

第一作者：Peng, Haijun

通信作者：Hong, B[1]

机构：[1]Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China;[2]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[3]Guizhou Inst Technol, Guiyang 550055, Peoples R China

第一机构：Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China

通信机构：corresponding author), Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China.

年份：2015

卷号：187

期号：9

外文期刊名：ENVIRONMENTAL MONITORING AND ASSESSMENT

收录：;EI(收录号：20153201114210);Scopus(收录号：2-s2.0-84938565576);WOS:【SCI-EXPANDED(收录号:WOS:000360313000004)】；

基金：This research was financially supported by the National Natural Science Foundation of China (grant numbers: 41173127, 41373134, and 40973089) and the Strategic Pilot Science and Technology Projects of the Chinese Academy of Sciences (XDA05120501). We are greatly indebted to Dr. Hongxuan Zhang from the Sichuan Academy of Grassland Science and Dr. Xinqiang Xi from Nanjing University for their assistance during the field work. Miss Xue Li from the Meteorological Bureau of Southwest Guizhou was thanked for providing the meteorological data. We also thank the anonymous reviewers for their constructive suggestions.

语种：英文

外文关键词：Alpine peatland; Ecosystem respiration; Soil temperature; Auto chamber; Qinghai-Tibet Plateau; Annual variability

摘要：Peatlands are widely developed in the eastern Qinghai-Tibet Plateau, but little is known about carbon budgets for these alpine peatland ecosystems. In this study, we used an automatic chamber system to measure ecosystem respiration in the Hongyuan peatland, which is located in the eastern Qinghai-Tibet Plateau. Annual ecosystem respiration measurements showed a typical seasonal pattern, with the peak appearing in June. The highest respiration was 10.43 mu mol CO2/m(2)/s, and the lowest was 0.20 mu mol CO2/m(2)/s. The annual average ecosystem respiration was 2.06 mu mol CO2/m(2)/s. The total annual respiration was 599.98 g C/m(2), and respiration during the growing season (from May to September) accounted for 78 % of the annual sum. Nonlinear regression revealed that ecosystem respiration has a significant exponential correlation with soil temperature at 10-cm depth (R-2 = 0.98). The Q(10) value was 3.90, which is far higher than the average Q(10) value of terrestrial ecosystems. Ecosystem respiration had an apparent diurnal variation pattern in growing season, with peaks and valleys appearing at approximately 14:00 and 10:00, respectively, which could be explainedby soil temperature and soil water content variation at 10-cm depth.