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Carbon fluxes across alpine, oasis, and desert ecosystems in northwestern China: The importance of water availability
Wang, HB (Wang, Haibo)1,2; Li, X (Li, Xin)3,4; Xiao, JF (Xiao, Jingfeng)2; Ma, MG (Ma, Mingguo)5; Tan, JL (Tan, Junlei)1; Wang, XF (Wang, Xufeng)1; Geng, LY (Geng, Liying)1
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
2019
Volume697Issue:0Pages:133978
DOI10.1016/j.scitotenv.2019.133978
Abstract

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.

Subject AreaEnvironmental Sciences
WOS IDWOS:000499668600017
Language英语
Indexed BySCI
KeywordEddy-covariance Terrestrial Ecosystems Semiarid Ecosystems Spatial Variability Seasonal-variation Dioxide Exchange Co2 Fluxes Energy Vegetation Responses
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
Cooperation Status国际
ISSN0048-9697
URL查看原文
PublisherELSEVIER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9043
Collection中国科学院青藏高原研究所
Corresponding AuthorLi, X (Li, Xin)
Affiliation1.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.
Recommended Citation
GB/T 7714
Wang, HB ,Li, X ,Xiao, JF ,et al. Carbon fluxes across alpine, oasis, and desert ecosystems in northwestern China: The importance of water availability[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,697(0):133978.
APA Wang, HB .,Li, X .,Xiao, JF .,Ma, MG .,Tan, JL .,...&Geng, LY .(2019).Carbon fluxes across alpine, oasis, and desert ecosystems in northwestern China: The importance of water availability.SCIENCE OF THE TOTAL ENVIRONMENT,697(0),133978.
MLA Wang, HB ,et al."Carbon fluxes across alpine, oasis, and desert ecosystems in northwestern China: The importance of water availability".SCIENCE OF THE TOTAL ENVIRONMENT 697.0(2019):133978.
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