气候变化领域集成服务门户(CCPortal): Effects of warming and grazing on N2O fluxes in an alpine meadow ecosystem on the Tibetan plateau

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DOI	10.1016/j.soilbio.2010.02.011
	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
通讯作者	Wang, SP (通讯作者)
发表日期	2010
ISSN	0038-0717
起始页码	944
结束页码	952
卷号	42 期号:6
英文摘要	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 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.
关键词	NITROUS-OXIDE EMISSIONS COLORADO SHORTGRASS STEPPE SOIL-ATMOSPHERE EXCHANGE FREEZE-THAW SEMIARID GRASSLAND CARBON-DIOXIDE METHANE FLUXES GAS EMISSIONS ARCTIC SOILS FOREST SOILS
英文关键词	Global warming; Grazing; N2O flux; Soil temperature; Soil moisture; Alpine meadow; FATE; Tibetan plateau
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:000277814700010
来源期刊	SOIL BIOLOGY & BIOCHEMISTRY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257751
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]. 中国科学院青藏高原研究所,2010,42(6).
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,42(6).
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 42.6(2010).