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	Seasonal variation of CO2 flux and its environmental factors in evergreen coniferous plantation
	Yu Guirui
	2005
关键词	Carbon dioxide Climate change Ecosystems Photosynthesis Plants (botany)
英文摘要	The effects of environmental factors on carbon flux were analyzed, the spatial and temporal variation of carbon flux was studied at the two heights of 23 m and 39 m with the eddy covariance technique, and the carbon budget was evaluated for evergreen coniferous plantation in the red earth hilly area during the year 2003. The results showed that photosynthetically active radiation (PAR) and soil temperature are essential factors strongly affecting the net ecosystem exchange (NEE); in the daytime, the response of NEE to PAR shows a rectangular hyperbola trend, and in the nighttime, the significant correlation was observed between soil temperature and soil respiration which was filtered using friction velocity. This ecosystem appeared as a carbon sink along the whole year of 2003, and the carbon flux showed the obvious seasonal fluctuation and diurnal variability. The seasonal peak of NEE occurred in May and June with the daily sum about 0.61 - 0.67 mg · CO2 · m -2 · s-1. For the severe drought in the mid-summer, the daily sum was 0.40 - 0.44 mg · CO2 · m -2 · s-1 in July which was only 2/3 of that in the last two months. For the lasted drought of the year, the nadir of NEE happened in the winder with the daily sum about -0.29 to -0.35 mg · CO2 · m-2 · s-1. The sink intensity of the ecosystem was about -0.553 to -0.645 kg · Cm-2 per year in 2003. Copyright by Science in China Press 2005.
出处	Science in China, Series D: Earth Sciences
卷	48期:SUPPL.1页:123-132
收录类别	EI
语种	英语
内容类型	EI期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/24727]
专题	地理科学与资源研究所_历年回溯文献 地理科学与资源研究所_生态系统研究网络观测与模拟重点实验室_CERN水分分中心
推荐引用方式 GB/T 7714	Yu Guirui. Seasonal variation of CO2 flux and its environmental factors in evergreen coniferous plantation. 2005.

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