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	Soil moisture effect on the temperature dependence of ecosystem respiration in a subtropical Pinus plantation of southeastern China
	Wen X. F. ; Yu G. R. ; Sun X. M. ; Li Q. K. ; Liu Y. F. ; Zhang L. M. ; Ren C. Y. ; Fu Y. L. ; Li Z. Q.
	2006
关键词	carbon cycle climate change eddy covariance Q(10) value drought effects water-vapor exchange mixed hardwood forest carbon-dioxide environmental-control seasonal-variations flux measurements deciduous forest european forests boreal forest beech forest
英文摘要	Variation in temperature accounts for most of the seasonal fluctuation of terrestrial ecosystem respiration. However, other factors, such as soil moisture, also influence ecosystem respiration. In this study, continuous measurement of carbon dioxide exchange was made over a subtropical Pinus plantation of southeastern China using the eddy covariance (EC) technique. The effect of soil water content on ecosystem respiration and its sensitivity to temperature (Q(10)) were examined during the unusual dry summer of 2003. The results indicate that soil water content significantly affected the dynamics of respiration rate and its relationship with temperature in the drought-stressed ecosystem. The effect of soil water content on the Q(10) value of ecosystem respiration is described best by a quadratic function, instead of the commonly used multiplicative model. The regression model analysis revealed that ecosystem respiration was more sensitive to soil water content than is estimated by the multiplicative model. The multiplicative model led to an overestimation of response of the respiration to warming under the dry soil condition. Sensitivity of the ecosystem respiration to temperature was found to vary with air temperature and soil water content. This, to a considerable extent, precludes accurate estimates of the seasonal dynamics of ecosystem respiration. (c) 2006 Elsevier B.V. All rights reserved.
出处	Agricultural and Forest Meteorology
卷	137
期	3-4
页	166-175
收录类别	SCI
语种	英语
ISSN号	0168-1923
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22806]
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	Wen X. F.,Yu G. R.,Sun X. M.,et al. Soil moisture effect on the temperature dependence of ecosystem respiration in a subtropical Pinus plantation of southeastern China. 2006.

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