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	Seasonal variation of carbon exchange of typical forest ecosystems along the eastern forest transect in China
	Zhang L. M. ; Yu G. R. ; Sun X. M. ; Wen X. F. ; Ren C. Y. ; Song X. ; Liu Y. F. ; Guan D. X. ; Yan J. H. ; Zhang Y. P.
	2006
关键词	forest transect carbon budget ecosystem photosynthesis ecosystem respiration ChinaFLUX eddy covariance water-vapor exchange dioxide exchange environmental controls tropical forest boreal forests mixed forest long-term co2 flux respiration temperate
英文摘要	The long-term and continuous carbon fluxes of Changbaishan temperate mixed forest (CBS), Qianyanzhou subtropical evergreen coniferous forest (QYZ), Dinghushan subtropical evergreen mixed forest (DHS) and Xishuangbana tropical rainforest (XSBN) have been measured with eddy covariance techniques. In 2003, different responses of carbon exchange to the environment appeared across the four ecosystems. At CBS, the carbon exchange was mainly determined by radiation and temperature. 0 degrees C and 10 degrees C were two important temperature thresholds; the former determined the length of the growing season and the latter affected the magnitude of carbon exchange. The maximum net ecosystem exchange (NEE) of CBS occurred in early summer because maximum ecosystem photosynthesis (G(PP)) occurred earlier than maximum ecosystem respiration (Re). During summer, QYZ experienced severe drought and NEE decreased significantly mainly as a result of the depression of GPP. At DHS and XSBN, NEE was higher in the drought season than the wet season, especially the conversion between carbon sink and source occurring during the transition season at XSBN. During the wet season, increased fog and humid weather resulted from the plentiful rainfall, the ecosystem G(PP) was dispressed. The Q(10) and annual respiration of XSBN were the highest among the four ecosystems, while the average daily respiration of CBS during the growing season was the highest. Annual NEE of CBS, QYZ, DHS and XSBN were 181.5, 360.9, 536.2 and -320.0 g(.)C(.)m(-2.)a(-1), respectively. From CBS to DHS, the temperature and precipitation increased with the decrease in latitude. The ratio of N-EE/R-e increased with latitude, while R-e/G(PP), ecosystem light use efficiency (L-UE), precipitation use efficiency and average daily GPP decreased gradually. However, XSBN usually escaped such latitude trend probably because of the influence of the south-west monsoon climate which does not affect the other ecosystems. Long-term measurement and more research were necessary to understand the adaptation of forest ecosystems to climate change and to evaluate the ecosystem carbon balance due to the complexity of structure and function of forest ecosystems.
出处	Science in China Series D-Earth Sciences
卷	49
页	47-62
收录类别	SCI
语种	英语
ISSN号	1006-9313
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22395]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Zhang L. M.,Yu G. R.,Sun X. M.,et al. Seasonal variation of carbon exchange of typical forest ecosystems along the eastern forest transect in China. 2006.

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