Effects of warming and grazing on N(2)O fluxes in an alpine meadow ecosystem on the Tibetan plateau

NWIPB OpenIR

	Effects of warming and grazing on N(2)O fluxes in an alpine meadow ecosystem on the Tibetan plateau
	Hu, YG; Chang, XF; Lin, XW; Wang, YF; Wang, SP; Duan, JC; Zhang, ZH; Yang, XX; Luo, CY; Xu, GP; Zhao, XQ
	2010
发表期刊	SOIL BIOLOGY & BIOCHEMISTRY
ISSN	0038-0717
卷号	42 期号:6 页码:944-952
摘要	A great deal of uncertainty is associated with estimates of global nitrous oxide (N(2)O) 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 N(2)O flux to grazing under future warming conditions. This experiment was conducted to determine the effects of warming and grazing on N(2)O 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 N(2)O flux varied with sampling date, season, and year. No interactive effect between warming and grazing was found. Warming did not affect annual N(2)O flux when grazing was moderate during the growing season because the tradeoff of the effect of warming on N(2)O 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 N(2)O 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 N(2)O flux to grazing in the region. Winter accounted for 36-57% of annual N(2)O flux for NWNG and NWG, whereas only for 5-8% of annual N(2)O flux for WNG and WG. Soil temperature could explain 5-35% of annual N(2)O flux variation. (C) 2010 Elsevier Ltd. All rights reserved.
关键词	Global Warming Grazing n(2)o Flux Soil Temperature Soil Moisture Alpine Meadow Fate Tibetan Plateau
收录类别	sci
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1686
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, YG,Chang, XF,Lin, XW,et al. Effects of warming and grazing on N(2)O fluxes in an alpine meadow ecosystem on the Tibetan plateau[J]. SOIL BIOLOGY & BIOCHEMISTRY,2010,42(6):944-952.
APA	Hu, YG.,Chang, XF.,Lin, XW.,Wang, YF.,Wang, SP.,...&Zhao, XQ.(2010).Effects of warming and grazing on N(2)O fluxes in an alpine meadow ecosystem on the Tibetan plateau.SOIL BIOLOGY & BIOCHEMISTRY,42(6),944-952.
MLA	Hu, YG,et al."Effects of warming and grazing on N(2)O fluxes in an alpine meadow ecosystem on the Tibetan plateau".SOIL BIOLOGY & BIOCHEMISTRY 42.6(2010):944-952.