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	Precipitation frequency controls interannual variation of soil respiration by affecting soil moisture in a subtropical forest plantation
	Wang Y. D. ; Li Q. K. ; Wang H. M. ; Wen X. F. ; Yang F. T. ; Ma Z. Q. ; Liu Y. F. ; Sun X. M. ; Yu G. R.
	2011
关键词	broad-leaved forest ponderosa pine co2 efflux temperature sensitivity coniferous plantation experimental drought microbial biomass carbon-dioxide ecosystem exchange
英文摘要	Despite the significance of interannual variation of soil respiration (R(S)) for understanding long-term soil carbon dynamics, factors that control the interannual variation of R(S) have not been sufficiently investigated. Interannual variation of R(S) was studied using a 6-year data set collected in a subtropical plantation dominated by an exotic species, slash pine (Pinus elliottii Engelm.), in China. The results showed that seasonal variation of R(S) was significantly affected by soil temperature and soil water content (SWC). R(S) in the dry season (July October) was constrained by seasonal drought. Mean annual R(S) was estimated to be 736 +/- 30 g C.m(-2).year(-1), with a range of 706-790 g C.m(-2).year(-1). Although this forest was characterized by a humid climate with high precipitation (1469 mm.year(-1)), the interannual variation of R(S) was attributed to the changes of annual mean SWC (R(2) = 0.66, P = 0.03), which was affected by annual rainfall frequency (R(2) = 0.80, P < 0.01) and not rainfall amount (P = 0.84). Consequently, precipitation pattern indirectly controlled the interannual variation of R(S) by affecting soil moisture in this subtropical forest. In the context of climate change, interannual variation of R(S) in subtropical ecosystems is expected to increase because of the predicted changes of precipitation regime.
出处	Canadian Journal of Forest Research-Revue Canadienne De Recherche Forestiere
卷	41
期	9
页	1897-1906
收录类别	SCI
语种	英语
ISSN号	0045-5067
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22835]
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	Wang Y. D.,Li Q. K.,Wang H. M.,et al. Precipitation frequency controls interannual variation of soil respiration by affecting soil moisture in a subtropical forest plantation. 2011.

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