Comparison of eddy covariance and chamber-based methods for measuring CO2 flux in a temperate mixed forest

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	Comparison of eddy covariance and chamber-based methods for measuring CO2 flux in a temperate mixed forest
	Wang, M; Guan, DX; Han, SJ; Wu, JL; Wang, M, Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China
刊名	TREE PHYSIOLOGY
	2010
卷号	30 期号:1 页码:149-163
关键词	Chamber-based Measurement Eddy Covariance Method Foliage Respiration Net Ecosystem Exchange Of Co2 Soil Respiration Stem Respiration
ISSN号	0829-318X
英文摘要	Two methods, eddy covariance and chamber-based measurements, were employed to measure the net ecosystem CO2 exchange in a mature temperate mixed forest in 2003. The eddy covariance system was used as a reference, which was compared with the chamber-based method. Based on chamber fluxes, the ecosystem had a gross primary production of 1490 g C m(-2) year(-1), 90% of which was released as efflux back into the air via respiration of the entire ecosystem. This was comprised of about 48% from soil surface CO2 efflux, 31% from leaf respiration and 21% from stem and branch respiration. Net ecosystem exchange (NEE), estimated from the sum of daily component fluxes, was 146 g C m(-2) year(-1). Ecosystem respiration (ER), estimated from the sum of daily ecosystem respiration, was 1240 g C m(-2) year(-1). NEE was 9.8% of actual gross primary production (GPP). The eddy covariance estimates of NEE, ER and GPP were 188, 1030 and 1220 g C m(-2) year(-1), respectively. The eddy covariance estimation of NEE was higher than that of the chamber-based estimation by 22.5%. On a daily basis, NEE of the scaled chamber measurements was in acceptable agreement with eddy covariance measurement data with R-2 values of 0.71. The discrepancy between the measurement of the two methods was greater in the non-growing season primarily due to the lack of spatial variability in the scaled chamber estimates and weak atmosphere turbulence by eddy covariance measurements. There are many uncertainties for determination of absolute values of ecosystem component flux. More detailed experiments and related theoretical studies are needed in the future.
学科主题	Forestry
语种	英语
WOS记录号	WOS:000273504400013
资助机构	National Natural Science Foundation of China [30870376, 30590382/ C011108]; Chinese Academy of Sciences [KZCX2-YW-416]; Major State Basic Research Development Program [2010CB833502]
公开日期	2011-09-23
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/53955]
专题	沈阳应用生态研究所_沈阳应用生态研究所
通讯作者	Wang, M, Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Wang, M,Guan, DX,Han, SJ,et al. Comparison of eddy covariance and chamber-based methods for measuring CO2 flux in a temperate mixed forest[J]. TREE PHYSIOLOGY,2010,30(1):149-163.
APA	Wang, M,Guan, DX,Han, SJ,Wu, JL,&Wang, M, Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China.(2010).Comparison of eddy covariance and chamber-based methods for measuring CO2 flux in a temperate mixed forest.TREE PHYSIOLOGY,30(1),149-163.
MLA	Wang, M,et al."Comparison of eddy covariance and chamber-based methods for measuring CO2 flux in a temperate mixed forest".TREE PHYSIOLOGY 30.1(2010):149-163.