气候变化领域集成服务门户(CCPortal): Carbon and water fluxes in an alpine steppe ecosystem in the Nam Co area of the Tibetan Plateau during two years with contrasting amounts of precipitation

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DOI	10.1007/s00484-020-01892-2
	Carbon and water fluxes in an alpine steppe ecosystem in the Nam Co area of the Tibetan Plateau during two years with contrasting amounts of precipitation
	Wang, Yuyang; Zhu, Zhikun; Ma, Yaoming; Yuan, Ling
通讯作者	Ma, YM (通讯作者)
发表日期	2020
ISSN	0020-7128
EISSN	1432-1254
起始页码	1183
结束页码	1196
卷号	64 期号:7
英文摘要	Carbon and water fluxes and their interactions with climate drivers in alpine grasslands on the Tibetan Plateau are poorly understood. This lack of understanding is particularly evident for the alpine steppe in the Nam Co area of the hinterland on the Tibetan Plateau, which is vulnerable and exceedingly sensitive to climate change. In this study, eddy covariance (EC) measurements of carbon dioxide (CO2) and water fluxes were carried out in this region during the growing season of 2008 and 2009, with contrasting hydrological conditions. The results show that (1) the monthly patterns of carbon and water fluxes differed markedly in the two years; the total respiration (Re), net ecosystem carbon dioxide exchange (NEE) and gross primary productivity (GPP) were 181.6 +/- 11.5, - 62.6 +/- 10.8, and 244.2 +/- 9.6 and 144.6 +/- 12.0, - 32.4 +/- 11.7, and 176.9 +/- 12.3 g C m(-2)during the growing seasons in 2008 and 2009; meanwhile, the cumulative evapotranspiration (ET) values were 503.1 +/- 13.5 and 387.3 +/- 8.2 mm during the growing season in 2008 and 2009, respectively. The cumulative carbon fluxes and ET were both higher in the wetter 2008 than in the drier 2009, consistent with the precipitation results. (2) Soil water content (SWC) played a paramount role in the variations in carbon fluxes (NEE, GPP, and Re) and ET during the vegetative period over the two years. As a result, the alpine steppe ecosystem was water-limited. (3) Water stress caused by the low surface soil water content significantly depressed photosynthesis and ET during the daytime in July and August. (4) Water use efficiency (WUE) had a negative relationship with SWC during the growing season in these two years, and the WUE increased during drought.
关键词	EDDY COVARIANCE MEASUREMENTS USE EFFICIENCY DIOXIDE EXCHANGE NET ECOSYSTEM INNER-MONGOLIA SOIL-MOISTURE VAPOR FLUXES GRASSLAND ECOSYSTEMS BIOPHYSICAL CONTROLS SEMIARID SHRUBLAND
英文关键词	Carbon flux; Water flux; Alpine steppe ecosystem; Tibetan Plateau; Precipitation
语种	英语
WOS研究方向	Biophysics ; Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences ; Physiology
WOS类目	Biophysics ; Environmental Sciences ; Meteorology & Atmospheric Sciences ; Physiology
WOS记录号	WOS:000540282100012
来源期刊	INTERNATIONAL JOURNAL OF BIOMETEOROLOGY
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/259800
推荐引用方式 GB/T 7714	Wang, Yuyang,Zhu, Zhikun,Ma, Yaoming,et al. Carbon and water fluxes in an alpine steppe ecosystem in the Nam Co area of the Tibetan Plateau during two years with contrasting amounts of precipitation[J]. 中国科学院青藏高原研究所,2020,64(7).
APA	Wang, Yuyang,Zhu, Zhikun,Ma, Yaoming,&Yuan, Ling.(2020).Carbon and water fluxes in an alpine steppe ecosystem in the Nam Co area of the Tibetan Plateau during two years with contrasting amounts of precipitation.INTERNATIONAL JOURNAL OF BIOMETEOROLOGY,64(7).
MLA	Wang, Yuyang,et al."Carbon and water fluxes in an alpine steppe ecosystem in the Nam Co area of the Tibetan Plateau during two years with contrasting amounts of precipitation".INTERNATIONAL JOURNAL OF BIOMETEOROLOGY 64.7(2020).