Response of ecosystem respiration to warming and grazing during the growing seasons in the alpine meadow on the Tibetan plateau

NWIPB OpenIR

	Response of ecosystem respiration to warming and grazing during the growing seasons in the alpine meadow on the Tibetan plateau
	Lin, Xingwu ; Zhang, Zhenhua ; Wang, Shiping ; Hu, Yigang ; Xu, Guangping ; Luo, Caiyun ; Chang, Xiaofeng ; Duan, Jichuang ; Lin, Qiaoyan ; Xu, Burenbayin ; Wang, Yanfen ; Zhao, Xinquan ; Xie, Zubin
	2011-07-15
发表期刊	AGRICULTURAL AND FOREST METEOROLOGY ; Lin, XW; Zhang, ZH; Wang, SP; Hu, YG; Xu, GP; Luo, CY; Chang, XF; Duan, JC; Lin, QY; Xu, BRBY; Wang, YF; Zhao, XQ; Xie, ZB.Response of ecosystem respiration to warming and grazing during the growing seasons in the alpine meadow on the Tibetan plateau,AGRICULTURAL AND FOREST METEOROLOGY,2011,151(7):792-802
摘要	Intensive studies reveal that there is much uncertainty regarding how ecosystem and soil respiration will respond to warming and grazing, especially in the alpine meadow ecosystem. We conducted a first of its kind field-manipulative warming and grazing experiment in an alpine meadow on the Tibetan plateau to determine the effects of warming and grazing on ecosystem and soil respiration for 3-years, from 2006 to 2008. Generally, warming and grazing did not affect seasonal average ecosystem respiration (Re), and there was no interaction between grazing and warming. However, they significantly affected the Re early in the growing season and by the end of the growing season. Warming significantly increased seasonal average soil respiration (Rs) by 9.2%, whereas the difference mainly resulted from data gathered early in the growing season, before June 2007. Positive correlations between soil temperature and Re and Rs were observed, and soil temperature explained 63-83% of seasonal Re variations during the 3-year study and 19-34% of Rs variations in 2007. Seasonal Re in 2008 and Rs in 2007 were slightly negatively correlated to soil moisture, but interannual average Re decreased with a decrease in precipitation for all treatments. Warming and grazing reduced the Q(10) value of Re in 2007 and 2008 but did not affect the Q(10) value of Rs. The Q(10) values of Rs were much lower than the Q(10) values of Re in 2007. These results suggest that grazing may reduce the temperature sensitivity of Re and that Re was mainly controlled by soil temperature rather than moisture which varied with timescale in the alpine meadow. (C) 2011 Elsevier B.V. All rights reserved.; Intensive studies reveal that there is much uncertainty regarding how ecosystem and soil respiration will respond to warming and grazing, especially in the alpine meadow ecosystem. We conducted a first of its kind field-manipulative warming and grazing experiment in an alpine meadow on the Tibetan plateau to determine the effects of warming and grazing on ecosystem and soil respiration for 3-years, from 2006 to 2008. Generally, warming and grazing did not affect seasonal average ecosystem respiration (Re), and there was no interaction between grazing and warming. However, they significantly affected the Re early in the growing season and by the end of the growing season. Warming significantly increased seasonal average soil respiration (Rs) by 9.2%, whereas the difference mainly resulted from data gathered early in the growing season, before June 2007. Positive correlations between soil temperature and Re and Rs were observed, and soil temperature explained 63-83% of seasonal Re variations during the 3-year study and 19-34% of Rs variations in 2007. Seasonal Re in 2008 and Rs in 2007 were slightly negatively correlated to soil moisture, but interannual average Re decreased with a decrease in precipitation for all treatments. Warming and grazing reduced the Q(10) value of Re in 2007 and 2008 but did not affect the Q(10) value of Rs. The Q(10) values of Rs were much lower than the Q(10) values of Re in 2007. These results suggest that grazing may reduce the temperature sensitivity of Re and that Re was mainly controlled by soil temperature rather than moisture which varied with timescale in the alpine meadow. (C) 2011 Elsevier B.V. All rights reserved.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/40824
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Lin, Xingwu,Zhang, Zhenhua,Wang, Shiping,et al. Response of ecosystem respiration to warming and grazing during the growing seasons in the alpine meadow on the Tibetan plateau[J]. AGRICULTURAL AND FOREST METEOROLOGY, Lin, XW; Zhang, ZH; Wang, SP; Hu, YG; Xu, GP; Luo, CY; Chang, XF; Duan, JC; Lin, QY; Xu, BRBY; Wang, YF; Zhao, XQ; Xie, ZB.Response of ecosystem respiration to warming and grazing during the growing seasons in the alpine meadow on the Tibetan plateau,AGRICULTURAL AND FOREST METEOROLOGY,2011,151(7):792-802,2011.
APA	Lin, Xingwu.,Zhang, Zhenhua.,Wang, Shiping.,Hu, Yigang.,Xu, Guangping.,...&Xie, Zubin.(2011).Response of ecosystem respiration to warming and grazing during the growing seasons in the alpine meadow on the Tibetan plateau.AGRICULTURAL AND FOREST METEOROLOGY.
MLA	Lin, Xingwu,et al."Response of ecosystem respiration to warming and grazing during the growing seasons in the alpine meadow on the Tibetan plateau".AGRICULTURAL AND FOREST METEOROLOGY (2011).