气候变化领域集成服务门户(CCPortal): Carbon dioxide exchange between an alpine steppe ecosystem and the atmosphere on the Nam Co area of the Tibetan Plateau

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DOI	10.1016/j.agrformet.2014.12.013
	Carbon dioxide exchange between an alpine steppe ecosystem and the atmosphere on the Nam Co area of the Tibetan Plateau
	Zhu, Zhikun; Ma, Yaoming; Li, Maoshan; Hu, Zeyong; Xu, Chao; Zhang, Lang; Han, Cunbo; Wang, Yongjie; Ichiro, Tamagawa
通讯作者	Ma, YM (通讯作者)
发表日期	2015
ISSN	0168-1923
EISSN	1873-2240
起始页码	169
结束页码	179
卷号	203
英文摘要	The net ecosystem carbon dioxide (CO2) exchange (NEE) between the atmosphere and an alpine steppe ecosystem was measured by the Eddy covariance (EC) method on the Nam Co area of the Tibetan Plateau during the growing season in 2008 and 2009. The diurnal amplitude of NEE varied substantially during the growing seasons. The maximum CO2 uptake rates were 3.74 and 3.44 mu mol CO2 m(-2) s(-4) in August 2008 and 2009, respectively. The peak daily CO2,uptake was observed on 16 July (DOY 198, 1.19 g Cm-2 day(-1)) 2008, which occurred one month earlier than that in 2009 (DOY 228, 1.12 g Cm(-2)day(-1)). This indicated that the alpine steppe had lower carbon sequestration potential comparing with other grasslands. The daily NEE responded to AGB in a linear manner (NEE=( O.0073 +/- 0.0027) x AGB) + (0.0533 +/- 0.2049), R-2 = 0.52). Fifty-two percent of the NEE variance could be explained by the variance of AGB. The amount and pattern of precipitation was significantly different between the two growing seasons. In 2008, the steppe received 493 mm from May to September. In contrast, the value was 327 mm in 2009 and more than 50% of this precipitation was received in August. The alpine steppe ecosystem became a weak carbon source in June 2009 (0.48 g Cm-2) due to relatively low soil volumetric water content (VWC) and the relatively high temperature. The cumulative NEE for the growing season from May to September was 63.17 and 35.51 g Cm-2 in 2008 and 2009, respectively. Variations in soil moisture had important effect on carbon exchange in this alpine steppe ecosystem. Both the photosynthesis and respiration were active under high soil moisture content, and suppressed during periods of water shortage. (C) 2015 Elsevier B.V. All rights reserved.
关键词	EDDY COVARIANCE MEASUREMENTS TERRESTRIAL ECOSYSTEMS QUALITY ASSESSMENT SOIL RESPIRATION SPATIAL VARIABILITY WATER-VAPOR FLUX TEMPERATURE MEADOW GRASSLAND
英文关键词	Alpine steppe; Net ecosystem CO2 exchange; Nam Co area; Tibetan Plateau
语种	英语
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000350934500016
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
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/258537
推荐引用方式 GB/T 7714	Zhu, Zhikun,Ma, Yaoming,Li, Maoshan,et al. Carbon dioxide exchange between an alpine steppe ecosystem and the atmosphere on the Nam Co area of the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2015,203.
APA	Zhu, Zhikun.,Ma, Yaoming.,Li, Maoshan.,Hu, Zeyong.,Xu, Chao.,...&Ichiro, Tamagawa.(2015).Carbon dioxide exchange between an alpine steppe ecosystem and the atmosphere on the Nam Co area of the Tibetan Plateau.AGRICULTURAL AND FOREST METEOROLOGY,203.
MLA	Zhu, Zhikun,et al."Carbon dioxide exchange between an alpine steppe ecosystem and the atmosphere on the Nam Co area of the Tibetan Plateau".AGRICULTURAL AND FOREST METEOROLOGY 203(2015).