Seasonal and annual variation of CO2 flux above a broadleaved Korean pine mixed forest

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	Seasonal and annual variation of CO2 flux above a broadleaved Korean pine mixed forest
	Zhang, JH ; Yu, GR ; Han, SJ ; Guan, DX ; Sun, XM
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2006
卷号	49 页码:63-73
关键词	old-growth forest eddy-covariance carbon metabolism seasonal and annual dynamics
ISSN号	1006-9313
通讯作者	Zhang, JH, Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China
中文摘要	Long-term measurement of carbon metabolism of old-growth forests is critical to predict their behaviors and to reduce the uncertainties of carbon accounting under changing climate. Eddy covariance technology was applied to investigate the long-term carbon exchange over a 200 year-old Chinese broad-leaved Korean pine mixed forest in the Changbai Mountains (128 degrees 28'E and 42 degrees 24'N, Jilin Province, P. R. China) since August 2002. On the data obtained with open-path eddy covariance system and CO2 profile measurement system from Jan. 2003 to Dec. 2004, this paper reports (i) annual and seasonal variation of F-NEE, F-GPP and R-E; (ii) regulation of environmental factors on phase and amplitude of ecosystem CO2 uptake and release Corrections due to storage and friction velocity were applied to the eddy carbon flux. L-AI and soil temperature determined the seasonal and annual dynamics of F-GPP and R-E separately. V-PD and air temperature regulated ecosystem photosynthesis at finer scales in growing seasons. Water condition at the root zone exerted a significant influence on ecosystem maintenance carbon metabolism of this forest in winter. The forest was a net sink of atmospheric CO2 and sequestered -449 g C(.)m 2 during the study period; -278 and -171 gC(.)m(2) for 2003 and 2004 respectively. F-GPP and F-RE over 2003 and 2004 were -1332, -1294 g C(.)m(-2) and 1054, 1124 g C(.)m(-2) respectively. This study shows that old-growth forest can be a strong net carbon sink of atmospheric CO2. There was significant seasonal and annual variation in carbon metabolism. In winter, there was weak photosynthesis while the ecosystem emitted CO2. Carbon exchanges were active in spring and fall but contributed little to carbon sequestration on an annual scale. The summer is the most significant season as far as ecosystem carbon balance is concerned. The 90 days of summer contributed 66.9, 68.9% of FG(PP), and 60.4, 62.1 % of R-E of the entire year.
学科主题	Geosciences, Multidisciplinary
收录类别	SCI
语种	英语
WOS记录号	WOS:000242721500005
公开日期	2011-09-23
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/54797]
专题	沈阳应用生态研究所_沈阳应用生态研究所_期刊论文
推荐引用方式 GB/T 7714	Zhang, JH,Yu, GR,Han, SJ,et al. Seasonal and annual variation of CO2 flux above a broadleaved Korean pine mixed forest[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2006,49:63-73.
APA	Zhang, JH,Yu, GR,Han, SJ,Guan, DX,&Sun, XM.(2006).Seasonal and annual variation of CO2 flux above a broadleaved Korean pine mixed forest.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,49,63-73.
MLA	Zhang, JH,et al."Seasonal and annual variation of CO2 flux above a broadleaved Korean pine mixed forest".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 49(2006):63-73.