Fluxes of CO(2), CH(4), and N(2)O in an alpine meadow affected by yak excreta on the Qinghai-Tibetan plateau during summer grazing periods

NWIPB OpenIR

	Fluxes of CO(2), CH(4), and N(2)O in an alpine meadow affected by yak excreta on the Qinghai-Tibetan plateau during summer grazing periods
	Lin, XW; Wang, SP; Ma, XZ; Xu, GP; Luo, CY; Li, YN; Jiang, GM; Xie, ZB
	2009
发表期刊	SOIL BIOLOGY & BIOCHEMISTRY
ISSN	0038-0717
卷号	41 期号:4 页码:718-725
摘要	To assess the impacts of yak excreta patches on greenhouse gas (GHG) fluxes in the alpine meadow of the Qinghai-Tibetan plateau. methane (CH(4)), carbon dioxide (CO(2)), and nitrous oxide (N(2)O) fluxes were measured for the first time from experimental excreta patches placed on the meadow during the summer grazing seasons in 2005 and 2006. Dung patches were CH(4) sources (average 586 mu g m(-2) h(-1) in 2005 and 199 mu g m(-2) h(-1) in 2006) during the investigation period of two years, while urine patches (average -31 mu g m(-2) h(-1) in 2005 and -33 mu g m(-2) h(-1) in 2006) and control plots (average -28 mu g m(-2) h(-1) in 2005 and -30 mu g m(-2) h(-1) in 2006) consumed CH(4). The cumulative CO(2) emission for dung patches was about 36-50% higher than control plots during the experimental period in 2005 and 2006. The cumulative N(2)O emissions for both urine and dung patches were 2.1-3.7 and 1.8-3.5 times greater than control plots in 2005 and 2006, respectively. Soil water-filled pore space (WFPS) explained 35% and 36% of CH(4) flux variation for urine patches and control plots, respectively. Soil temperature explained 40-75% of temporal variation of CO(2) emissions for all treatments. Temporal N(2)O flux variation in urine patches (34%), dung patches (48%), and control (56%) plots was mainly driven by the simultaneous effect of soil temperature and WFPS. Although yak excreta patches significantly affected GHG fluxes, their contributions to the whole grazing alpine meadow in terms of CO(2) equivalents are limited under the moderate grazing intensity (1.45 yak ha(-1)). However, the contributions of excreta patches to N(2)O emissions are not negligible when estimating N(2)O emissions in the grazing meadow. In this study, the N(2)O emission factor of yak excreta patches varied with year (about 0.9-1.0%, and 0.1-0.2% in 2005 and 2006, respectively), which was lower than IPCC default value of 2%. (C) 2009 Elsevier Ltd. All rights reserved.
关键词	Alpine Meadow Dung And Urine Patches Greenhouse Gas Fluxes Qinghai-tibetan Plateau Soil Temperature Soil Water-filled Pore Space (Wfps)
收录类别	sci
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1890
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, XW,Wang, SP,Ma, XZ,et al. Fluxes of CO(2), CH(4), and N(2)O in an alpine meadow affected by yak excreta on the Qinghai-Tibetan plateau during summer grazing periods[J]. SOIL BIOLOGY & BIOCHEMISTRY,2009,41(4):718-725.
APA	Lin, XW.,Wang, SP.,Ma, XZ.,Xu, GP.,Luo, CY.,...&Xie, ZB.(2009).Fluxes of CO(2), CH(4), and N(2)O in an alpine meadow affected by yak excreta on the Qinghai-Tibetan plateau during summer grazing periods.SOIL BIOLOGY & BIOCHEMISTRY,41(4),718-725.
MLA	Lin, XW,et al."Fluxes of CO(2), CH(4), and N(2)O in an alpine meadow affected by yak excreta on the Qinghai-Tibetan plateau during summer grazing periods".SOIL BIOLOGY & BIOCHEMISTRY 41.4(2009):718-725.