气候变化领域集成服务门户(CCPortal): Carbon fluxes across alpine, oasis, and desert ecosystems in northwestern China: The importance of water availability

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DOI	10.1016/j.scitotenv.2019.133978
	Carbon fluxes across alpine, oasis, and desert ecosystems in northwestern China: The importance of water availability
	Wang, Haibo; Li, Xin; Xiao, Jingfeng; Ma, Mingguo; Tan, Junlei; Wang, Xufeng; Geng, Liying
通讯作者	Li, X (通讯作者)
发表日期	2019
ISSN	0048-9697
EISSN	1879-1026
卷号	697
英文摘要	Dryland regions cover >40% of the Earth's land surface, making these ecosystems the largest biome in the world. Ecosystems in these areas play an important role in determining the interannual variability of the global terrestrial carbon sink. Examining carbon fluxes of various types of dryland ecosystems and their responses to climatic variability is essential for improving projections of the carbon cycle in these regions. In this study, we made use of observations from a regional flux tower observation network in a typical arid endorheic basin, the Heihe river basin (HRB). As a representative area of both the arid region of China and the entire region of central Asia, the HRB includes the main ecosystems in arid regions. We compared the spatial variations of carbon fluxes of five terrestrial ecosystems (i.e., grassland, cropland, desert, wetland, and forest ecosystems) and explored the responses of ecosystem carbon fluxes to climatic factors across different ecosystems. We found that our region exhibits a carbon sink ranging from 85.9 to 508.7 gC/m(2)/yr for different ecosystems, and the water availability is critical to the spatial variability of carbon fluxes in arid regions. Carbon fluxes across all sites exhibited weak correlations with temperature and precipitation. Marked differences in precipitation effects were observed between the sites within oases and those outside of oases. Irrigation and groundwater recharge were of great importance to the variations in carbon fluxes for the sites within oases. Evapotranspiration (ET) exhibited strong relationships with carbon fluxes, indicating that ET was a better metric of soil water availability than was precipitation in driving the spatial variability of carbon fluxes in arid regions. This study has implications for better understanding the carbon budget of terrestrial ecosystems and informing ecological management in dryland regions. (C) 2019 Elsevier B.V. All rights reserved.
关键词	EDDY-COVARIANCE TERRESTRIAL ECOSYSTEMS SEMIARID ECOSYSTEMS SPATIAL VARIABILITY SEASONAL-VARIATION DIOXIDE EXCHANGE CO2 FLUXES ENERGY VEGETATION RESPONSES
英文关键词	Dryland ecosystems; Alpine-desert-oasis system; Carbon exchange; Evapotranspiration; Water use efficiency; Water availability
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000499668600017
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
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/259498
推荐引用方式 GB/T 7714	Wang, Haibo,Li, Xin,Xiao, Jingfeng,et al. Carbon fluxes across alpine, oasis, and desert ecosystems in northwestern China: The importance of water availability[J]. 中国科学院青藏高原研究所,2019,697.
APA	Wang, Haibo.,Li, Xin.,Xiao, Jingfeng.,Ma, Mingguo.,Tan, Junlei.,...&Geng, Liying.(2019).Carbon fluxes across alpine, oasis, and desert ecosystems in northwestern China: The importance of water availability.SCIENCE OF THE TOTAL ENVIRONMENT,697.
MLA	Wang, Haibo,et al."Carbon fluxes across alpine, oasis, and desert ecosystems in northwestern China: The importance of water availability".SCIENCE OF THE TOTAL ENVIRONMENT 697(2019).