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	Rainfall pulse primarily drives litterfall respiration and its contribution to soil respiration in a young exotic pine plantation in subtropical China
	Wang Y. D. ; Wang Z. L. ; Wang H. M. ; Guo C. C. ; Bao W. K.
	2012
关键词	mixed hardwood forest co2 efflux coniferous plantation precipitation pulses aboveground litter carbon sequestration microbial biomass root respiration water content leaf-litter
英文摘要	Although litterfall respiration (R-L) is a key process of soil carbon dynamics in forests, factors that drive R-L and its contribution to soil respiration (R-S) have not been sufficiently studied. Using a litter removal method, we researched R-L and the ratio of R-L:R-S in a 20-year-old exotic slash pine (Pinus elliottii Englem.) plantation in subtropical China. Soil temperature explained 67%, 78%, and 25% of variation in R-S, mineral soil respiration (RS-L), and RL, respectively, but had little impact on R-L:R-S. To study influences besides temperature, measured R-S and RS-L were normalized using the Arrhenius equation. Even though this subtropical plantation was characterized by a humid climate with abundant precipitation, a rainfall pulse induced increase in soil moisture primarily drove R-L and its contribution to R-S but depressed RS-L. The response of R-L to rainfall and soil moisture was significantly more sensitive than that of RS-L. Furthermore, the effects of rainfall and soil moisture on R-S, R-L, and R-L:R-S were higher during the dry season (July-December) than during the wet season (January-June). In the context of climate change, R-L and its contribution to R-S are expected to decrease because of the predicted decrease in rainfall amount and frequency in subtropical regions.
出处	Canadian Journal of Forest Research-Revue Canadienne De Recherche Forestiere
卷	42
期	4
页	657-666
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/311030/26761]
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.,Wang Z. L.,Wang H. M.,et al. Rainfall pulse primarily drives litterfall respiration and its contribution to soil respiration in a young exotic pine plantation in subtropical China. 2012.

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