Effects of warming and grazing on N2O fluxes in an alpine meadow ecosystem on the Tibetan plateau

NWIPB OpenIR

	Effects of warming and grazing on N2O fluxes in an alpine meadow ecosystem on the Tibetan plateau
	Hu, Yigang ; Chang, Xiaofeng ; Lin, Xingwu ; Wang, Yanfen ; Wang, Shiping ; Duan, Jichuang ; Zhang, Zhenhua ; Yang, Xiaoxia ; Luo, Caiyun ; Xu, Guangping ; Zhao, Xinquan
	2010-06-01
发表期刊	SOIL BIOLOGY & BIOCHEMISTRY ; 汪诗平.Effects of warming and grazing on N2O fluxes in an alpine meadow ecosystem on the Tibetan plateau,Soil Biology & Biochemistry,2009,42():944-952
摘要	A great deal of uncertainty is associated with estimates of global nitrous oxide (N2O) emissions because emissions from arid and polar climates were not included in the estimates due to a lack of available data. In particular, very few studies have assessed the response of N2O flux to grazing under future warming conditions. This experiment was conducted to determine the effects of warming and grazing on N2O flux at different time scales for three years under a controlled warming-grazing system. A free-air temperature enhancement system (FATE) using infrared heaters and grazing significantly increased soil temperatures for both of growing (average 1.8 C in 2008) and no-growing seasons (average 3.0 C for 3-years) within 20-cm depth, but only warming reduced soil moisture at 10-cm soil depth during the growing season during the drought year of 2008. Generally, the effects of warming and grazing on N2O flux varied with sampling date, season, and year. No interactive effect between warming and grazing was found. Warming did not affect annual N2O flux when grazing was moderate during the growing season because the tradeoff of the effect of warming on N2O flux was observed between the growing season and no-growing season. No-warming with grazing (NWG) and warming with grazing (WG) significantly increased the average annual N2O flux (57.8 and 31.0%) compared with no-warming with no-grazing (NWNG) and warming with no-grazing (WNG), respectively, indicating that warming reduced the response of N2O flux to grazing in the region. Winter accounted for 36e57% of annual N2O flux for NWNG and NWG, whereas only for 5e8% of annual N2O flux for WNG and WG. Soil temperature could explain 5e35% of annual N2O flux variation.; A great deal of uncertainty is associated with estimates of global nitrous oxide (N2O) emissions because emissions from arid and polar climates were not included in the estimates due to a lack of available data. In particular, very few studies have assessed the response of N2O flux to grazing under future warming conditions. This experiment was conducted to determine the effects of warming and grazing on N2O flux at different time scales for three years under a controlled warming-grazing system. A free-air temperature enhancement system (FATE) using infrared heaters and grazing significantly increased soil temperatures for both of growing (average 1.8 degrees C in 2008) and no-growing seasons (average 3.0 degrees C for 3-years) within 20-cm depth, but only warming reduced soil moisture at 10-cm soil depth during the growing season during the drought year of 2008. Generally, the effects of warming and grazing on N2O flux varied with sampling date, season, and year. No interactive effect between warming and grazing was found. Warming did not affect annual N2O flux when grazing was moderate during the growing season because the tradeoff of the effect of warming on N2O flux was observed between the growing season and no-growing season. No-warming with grazing (NWG) and warming with grazing (WG) significantly increased the average annual N2O flux (57.8 and 31.0%) compared with no-warming with no-grazing (NWNG) and warming with no-grazing (WNG), respectively, indicating that warming reduced the response of N2O flux to grazing in the region. Winter accounted for 36-57% of annual N2O flux for NWNG and NWG, whereas only for 5-8% of annual N2O flux for WNG and WG. Soil temperature could explain 5-35% of annual N2O flux variation. (C) 2010 Elsevier Ltd. All rights reserved.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/46154
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	Hu, Yigang,Chang, Xiaofeng,Lin, Xingwu,et al. Effects of warming and grazing on N2O fluxes in an alpine meadow ecosystem on the Tibetan plateau[J]. SOIL BIOLOGY & BIOCHEMISTRY, 汪诗平.Effects of warming and grazing on N2O fluxes in an alpine meadow ecosystem on the Tibetan plateau,Soil Biology & Biochemistry,2009,42():944-952,2010.
APA	Hu, Yigang.,Chang, Xiaofeng.,Lin, Xingwu.,Wang, Yanfen.,Wang, Shiping.,...&Zhao, Xinquan.(2010).Effects of warming and grazing on N2O fluxes in an alpine meadow ecosystem on the Tibetan plateau.SOIL BIOLOGY & BIOCHEMISTRY.
MLA	Hu, Yigang,et al."Effects of warming and grazing on N2O fluxes in an alpine meadow ecosystem on the Tibetan plateau".SOIL BIOLOGY & BIOCHEMISTRY (2010).