干旱区生态环境知识资源中心(Arid): Carbon fluxes across alpine, oasis, and desert ecosystems in northwestern China: The importance of water availability

Arid

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 1,2; Li, Xin3,4 ; Xiao, Jingfeng 2; Ma, Mingguo 5; Tan, Junlei 1; Wang, Xufeng 1; Geng, Liying 1
通讯作者	Li, Xin
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2019
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.
英文关键词	Dryland ecosystems Alpine-desert-oasis system Carbon exchange Evapotranspiration Water use efficiency Water availability
类型	Article
语种	英语
国家	Peoples R China ; USA
收录类别	SCI-E
WOS记录号	WOS:000499668600017
WOS关键词	EDDY-COVARIANCE ; TERRESTRIAL ECOSYSTEMS ; SEMIARID ECOSYSTEMS ; SPATIAL VARIABILITY ; SEASONAL-VARIATION ; DIOXIDE EXCHANGE ; CO2 FLUXES ; ENERGY ; VEGETATION ; RESPONSES
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
EI主题词	2019-12-20
来源机构	中国科学院青藏高原研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311861
作者单位	1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Remote Sensing Gansu Prov, Heihe Remote Sensing Expt Res Stn, Lanzhou 730000, Gansu, Peoples R China; 2.Univ New Hampshire, Earth Syst Res Ctr, Inst Study Earth Oceans & Space, Durham, NH 03824 USA; 3.Chinese Acad Sci, Natl Tibetan Plateau Data Ctr, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China; 4.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China; 5.Southwest Univ, Chongqing Engn Res Ctr Remote Sensing Big Data Ap, Sch Geog Sci, Chongqing 400715, Peoples R China
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).