woyodo的个人博客分享 http://blog.sciencenet.cn/u/woyodo



已有 3732 次阅读 2012-5-7 16:36 |系统分类:论文交流| 土壤呼吸, 年际变异

Title: Precipitation frequency controls interannual variation of soil respiration by affecting soil moisture in a subtropical forest plantation

Authors: Yidong Wang, Qingkang Li, Huimin Wang, Xuefa Wen, Fengting Yang, Zeqing Ma, Yunfen Liu, Xiaomin Sun, and Guirui Yu
Journal: Canadian Journal of Forest Research
Abstract: Despite the significance of interannual variation of soil respiration (RS) for understanding long-term soil carbon dynamics, factors that control the interannual variation of RS have not been sufficiently investigated. Interannual variation of RS 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 RS was significantly affected by soil temperature and soil water content (SWC). RS in the dry season (July–October) was constrained by seasonal drought. Mean annual RS 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 RS was attributed to the changes of annual mean SWC (R2 = 0.66, P = 0.03), which was affected by annual rainfall frequency (R2 = 0.80, P < 0.01) and not rainfall amount (P = 0.84). Consequently, precipitation pattern indirectly controlled the interannual variation of RS by affecting soil moisture in this subtropical forest. In the context of climate change, interannual variation of RS in subtropical ecosystems is expected to increase because of the predicted changes of precipitation regime.


收藏 IP: 202.113.99.*| 热度|

1 高建国

该博文允许注册用户评论 请点击登录 评论 (0 个评论)


Archiver|手机版|科学网 ( 京ICP备07017567号-12 )

GMT+8, 2023-6-1 21:07

Powered by ScienceNet.cn

Copyright © 2007- 中国科学报社