Effects of grazing on CO2 balance in a semiarid steppe: field observations and modeling

doi:10.1007/s11368-013-0675-5

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	Effects of grazing on CO2 balance in a semiarid steppe: field observations and modeling
	Kang, Xiaoming 1; Hao, Yanbin 1; Cui, Xiaoyong 1; Chen, Huai 2; Li, Changsheng 3; (Rui, Yichao 4; Tian, Jianqing 5; Kardol, Paul 6; Zhong, Lei 1; Wang, Jinzhi 7
刊名	JOURNAL OF SOILS AND SEDIMENTS
	2013-06
卷号	13 期号:6 页码:1012-1023
关键词	Carbon budget DNDC Eddy covariance Grassland Grazing Soil heterotrophic respiration
ISSN号	1439-0108
DOI	10.1007/s11368-013-0675-5
产权排序	2
文献子类	Article
英文摘要	Carbon (C) dynamics in grassland ecosystem contributes to regional and global fluxes in carbon dioxide (CO2) concentrations. Grazing is one of the main structuring factors in grassland, but the impact of grazing on the C budget is still under debate. In this study, in situ net ecosystem CO2 exchange (NEE) observations by the eddy covariance technique were integrated with a modified process-oriented biogeochemistry model (denitrification-decomposition) to investigate the impacts of grazing on the long-term C budget of semiarid grasslands. NEE measurements were conducted in two adjacent grassland sites, non-grazing (NG) and moderate grazing (MG), during 2006-2007. We then used daily weather data for 1978-2007 in conjunction with soil properties and grazing scenarios as model inputs to simulate grassland productivity and C dynamics. The observed and simulated CO2 fluxes under moderate grazing intensity were compared with those without grazing. NEE data from 2-year observations showed that moderate grazing significantly decreased grassland ecosystem CO2 release and shifted the ecosystem from a negative CO2 balance (releasing 34.00 g C m(-2)) at the NG site to a positive CO2 balance (absorbing -43.02 g C m(-2)) at the MG site. Supporting our experimental findings, the 30-year simulation also showed that moderate grazing significantly enhances the CO2 uptake potential of the targeted grassland, shifting the ecosystem from a negative CO2 balance (57.08 +/- 16.45 g C m(-2) year(-1)) without grazing to a positive CO2 balance (-28.58 +/- 14.60 g C m(-2) year(-1)) under moderate grazing. The positive effects of grazing on CO2 balance could primarily be attributed to an increase in productivity combined with a significant decrease of soil heterotrophic respiration and total ecosystem respiration. We conclude that moderate grazing prevails over no-management practices in maintaining CO2 balance in semiarid grasslands, moderating and mitigating the negative effects of global climate change on the CO2 balance in grassland ecosystems.
学科主题	Agriculture ; Agronomy
URL标识	查看原文
WOS关键词	SOIL CARBON SEQUESTRATION ; GROSS PRIMARY PRODUCTION ; NITROUS-OXIDE EVOLUTION ; INNER-MONGOLIA ; ORGANIC-CARBON ; WATER-VAPOR ; INTERANNUAL VARIATION ; SPECIES COMPOSITION ; ECOSYSTEM CARBON ; RAINFALL EVENTS
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000319155200004
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/29831]
专题	生物多样性与生态系统服务领域_生态研究
作者单位	1.Univ Chinese Acad Sci, Coll Life Sci, Beijing 100049, Peoples R China; 2.Chinese Acad Sci, Chengdu Inst Biol, Chengdu 610041, Peoples R China; 3.Univ New Hampshire, Inst Study Earth Ocean & Space, Durham, NH 03824 USA; 4.Griffith Univ, Environm Futures Ctr, Brisbane, Qld 4111, Australia; 5.Chinese Acad Sci, Inst Microbiol, State Key Lab Mycol, Beijing 100101, Peoples R China; 6.Swedish Univ Agr Sci, Dept Forest Ecol & Management, S-90183 Umea, Sweden; 7.Chinese Res Inst Environm Sci, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Kang, Xiaoming,Hao, Yanbin,Cui, Xiaoyong,et al. Effects of grazing on CO2 balance in a semiarid steppe: field observations and modeling[J]. JOURNAL OF SOILS AND SEDIMENTS,2013,13(6):1012-1023.
APA	Kang, Xiaoming.,Hao, Yanbin.,Cui, Xiaoyong.,Chen, Huai.,Li, Changsheng.,...&Wang, Yanfen.(2013).Effects of grazing on CO2 balance in a semiarid steppe: field observations and modeling.JOURNAL OF SOILS AND SEDIMENTS,13(6),1012-1023.
MLA	Kang, Xiaoming,et al."Effects of grazing on CO2 balance in a semiarid steppe: field observations and modeling".JOURNAL OF SOILS AND SEDIMENTS 13.6(2013):1012-1023.