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Characterizing CO2 fluxes for growing and non-growing seasons in a shrub ecosystem on the Qinghai-Tibet Plateau
被引:8
作者:
XU Shixiao
Institute of Geographic Sciences and Natural Resources Research
Graduate School of the Chinese Academy of Sciences
National Institute for Environmental Studies
National Institute for Agro-Environmental Science
机构:
关键词:
alpine shrub ecosystem;
CO2;
flux;
carbon dynamics;
growing season;
non-growing season;
D O I:
暂无
中图分类号:
Q948.1 [植物生态学];
学科分类号:
071012 ;
0713 ;
摘要:
To assess carbon budget for shrub ecosystems on the Qinghai-Tibet Plateau, CO2 flux was measured with an open-path eddy covariance system for an alpine shrub ecosystem during growing and non-growing seasons. CO2 flux dynamics was distinct between the two seasons. During the growing season from May to September, the ecosystem exhibited net CO2 uptake from 08:00 to 19:00 (Beijing Standard Time), but net CO2 emission from 19:00 to 08:00. Maximum CO2 uptake appeared around 12:00 with values of 0.71, 1.19, 1.46 and 0.67 g CO2 m-2 h-1 for June, July, August and September, respectively. Diurnal fluctuation of CO2 flux showed higher correlation with photosynthetic photon flux density than temperature. The maximum net CO2 influx occurred in August with a value of 247 g CO2m-2. The total CO2 uptake by the ecosystem was up to 583 g CO2 m-2 for the growing season. During the non-growing season from January to April and from October to December, CO2 flux showed small fluctuation with the largest net CO2 efflux of 0.3
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页码:133 / 140
页数:8
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