Rainfall pulse primarily drives litterfall respiration and its contribution to soil respiration in a young exotic pine plantation in subtropical China

文献类型： 外文期刊

第一作者： Wang, Yidong

作者： Wang, Yidong;Wang, Zhong-Liang;Guo, Changcheng;Wang, Yidong;Wang, Huimin;Bao, Wankui

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期刊名称：CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE （ 影响因子：1.991； 五年影响因子：2.19 ）

ISSN： 0045-5067

年卷期： 2012 年 42 卷 4 期

页码：

收录情况： SCI

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.

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