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µÚÈýƪSCI½ÓÊÜ£¨Canadian Journal of Forest Research£©£¬É¢¾¡20£¨½ð±ÒÓÐÏÞ£¬¼ûÁ£©£¬¹²ÏíϲÔã¬Ò²×£´ó¼Ò½Ú½ÚÕ¶»ñ£¡
Title: Rainfall pulse primarily drives litterfall respiration and its contribution to soil respiration in a young exotic pine plantation in subtropical China

[ Last edited by wangyidong9165 on 2012-2-18 at 14:45 ]

Abstract: Although litterfall respiration (RL) is a key process of soil carbon dynamics in forests, factors that drive RL and its contribution to soil respiration (RS) have not been sufficiently studied. Using a litter removal method, we researched RL and the ratio of RL:RS 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 RS, mineral soil respiration (RS-L), and RL, respectively, but had little impact on RL:RS. To study influences besides temperature, measured RS 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 RL and its contribution to RS but depressed RS-L. The response of RL to rainfall and soil moisture was significantly more sensitive than that of RS-L. Furthermore, the effects of rainfall and soil moisture on RS, RL, and RL:RS were higher during the dry season (July¨CDecember) than during the wet season (January¨CJune). In the context of climate change, RL and its contribution to RS are expected to decrease because of the predicted decrease in rainfall amount and frequency in subtropical regions.

[ Last edited by wangyidong9165 on 2012-4-22 at 10:56 ]
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