气候变化领域集成服务门户(CCPortal): Three-year study of CO2 efflux and CH4/N2O fluxes at an alpine steppe site on the central Tibetan Plateau and their responses to simulated N deposition

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DOI	10.1016/j.geoderma.2014.05.002
	Three-year study of CO2 efflux and CH4/N2O fluxes at an alpine steppe site on the central Tibetan Plateau and their responses to simulated N deposition
	Wei, Da; Xu-Ri; Liu, Yongwen; Wang, Yinghong; Wang, Yuesi
通讯作者	Xu-Ri (通讯作者)
发表日期	2014
ISSN	0016-7061
EISSN	1872-6259
起始页码	88
结束页码	96
卷号	232
英文摘要	The alpine steppe covers 700,000 km(2) on the central and western Tibetan Plateau, constituting a large portion of China's total grassland ecosystem. Yet, limited effort has been made to quantify its greenhouse gas fluxes and examine how they will respond to increased reactive N deposition. Therefore, we conducted an experiment to simulate an elevated level of N deposition (10 kg N ha(-1) a(-1)) to investigate the variability in GHG fluxes and their responses to the N treatment. Three years of measurements showed that: (1) CO2 efflux was 132.7 +/- 20.1 mg m(-2) h(-1) during the growing season, while CH4 uptake was -60.0 +/- 7.1 mu g m(-2) h(-1). The alpine steppe acted as a weak source of N2O (0.14 +/- 038 mu g m(-2) h(-1)), but neither soil moisture nor temperature explained its variation. (2) Simulated N deposition significantly enhanced the plant community in the alpine steppe in terms of leaf tissue N content. However, neither the seasonal pattern nor the CO2 efflux and CH4 uptake were significantly affected by the N additions, and the emission factors (EFs) of N2O varied from 0.16 to 0.85% (0.56 +/- 020%). Our consecutive observations quantify the alpine steppe ecosystem of the Tibetan Plateau as a vital CH4 sink. The lower EFs of N2O in the simulated N deposition experiment confirm previous measurements at temperate grassland sites in China, implying a potential overestimation of N2O emissions based on the IPCC default. (C) 2014 Elsevier B.V. All rights reserved.
关键词	NITROGEN DEPOSITION SOIL RESPIRATION N2O EMISSIONS CH4 FOREST DEGRADATION FERTILIZER VARIABILITY GRASSLAND OXIDATION
英文关键词	Greenhouse gas fluxes; N deposition; Alpine steppe; Tibetan Plateau
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:000340315700010
来源期刊	GEODERMA
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/258285
推荐引用方式 GB/T 7714	Wei, Da,Xu-Ri,Liu, Yongwen,et al. Three-year study of CO2 efflux and CH4/N2O fluxes at an alpine steppe site on the central Tibetan Plateau and their responses to simulated N deposition[J]. 中国科学院青藏高原研究所,2014,232.
APA	Wei, Da,Xu-Ri,Liu, Yongwen,Wang, Yinghong,&Wang, Yuesi.(2014).Three-year study of CO2 efflux and CH4/N2O fluxes at an alpine steppe site on the central Tibetan Plateau and their responses to simulated N deposition.GEODERMA,232.
MLA	Wei, Da,et al."Three-year study of CO2 efflux and CH4/N2O fluxes at an alpine steppe site on the central Tibetan Plateau and their responses to simulated N deposition".GEODERMA 232(2014).