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Using deuterium excess, precipitation and runoff data to determine evaporation and transpiration: A case study from the Shawan Test Site, Puding, Guizhou, China
Hu, Yundi1,2,3; Liu, Zaihua1,2; Zhao, Min1,2; Zeng, Qingrui1,2,3; Zeng, Cheng1,2; Chen, Bo4; Chen, Chongying1,3; He, Haibo1,3; Cai, Xianli1,2,3; Ou, Yi2; Chen, Jia2
2018-12-01
Source PublicationGEOCHIMICA ET COSMOCHIMICA ACTA
ISSN0016-7037
Volume242Pages:21-33
Corresponding AuthorLiu, Zaihua(liuzaihua@vip.gyig.ac.cn)
AbstractSeparating watershed evapotranspiration into its evaporation and transpiration components is important for calculating the carbon that is assimilated by terrestrial vegetation in carbon cycle studies. The key step in this separation is to quantify the evaporation component. The deuterium excess (d-excess) in meteoric water has been shown to be an important indicator of both the original source of the water vapor and the humidity at the vapor source area. It has also shown promise for use in investigating the evaporation losses. While many studies have used the delta D/delta O-18 method to study watershed evaporation, few have discussed the differences between the delta D/delta O-18 (single isotope system) and d-excess (dual isotope system) methods in quantifying watershed evaporation. Given the complexity of natural watersheds, the Shawan Test Site was established at Puding, China, to study the water cycle in five concrete tanks (simulated watersheds) with different land uses over one hydrologic year. There were no plants in two of the tanks (bare rock and bare soil), which allowed verification of evaporation calculations derived from the d-excess and delta D/delta O-18 methods. delta D or delta O-18 values of precipitation in the rainy season, when most of the groundwater recharge occurs, showed great variability. In contrast, the d-excess of the meteoric waters collected during the same rainy season was much more stable than the delta D or delta O-18 values. We quantified the annual evaporative loss of the five watersheds using both methods. Comparison of the results indicated that the d-excess method is more acceptable than the delta D/delta O-18 method due to the stability of d-excess. Calculated ratios of transpiration to evapotranspiration in three tanks planted with vegetation were 56.8% in cultivated land, 70.9% in shrub land, and 85.9% in grassland, demonstrating that in well vegetated watersheds, this component of the cycle is controlled chiefly by plant transpiration. Land use has an important impact on the hydrologic cycle in a watershed, and the d-excess calculations conducted in this study provide new insights for quantifying components of the cycle, especially in the East Asian monsoon region which has rainfall with a large range in delta D or delta O-18 values. (C) 2018 Elsevier Ltd. All rights reserved.
KeywordDeuterium excess Stable water isotopes Land use type Plant transpiration Watershed evaporation Water cycle
DOI10.1016/j.gca.2018.08.049
WOS KeywordSTABLE-ISOTOPE COMPOSITION ; RESIDENCE TIMES ; RIVER-BASIN ; WATER ; FLOW ; DELTA-O-18 ; SURFACE ; CANADA ; FLUXES ; CO2
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[U1612441] ; National Natural Science Foundation of China[41430753] ; National Natural Science Foundation of China[41673136]
Funding OrganizationNational Natural Science Foundation of China
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000446475700002
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/52820
Collection中国科学院地理科学与资源研究所
Corresponding AuthorLiu, Zaihua
Affiliation1.Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Guizhou, Peoples R China
2.Chinese Acad Sci, Chinese Ecosyst Res Network, Puding Karst Ecosyst Res Stn, Puding 562100, Guizhou, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Guizhou Univ Finance & Econ, Inst Publ Adm, Guiyang 550025, Guizhou, Peoples R China
Recommended Citation
GB/T 7714
Hu, Yundi,Liu, Zaihua,Zhao, Min,et al. Using deuterium excess, precipitation and runoff data to determine evaporation and transpiration: A case study from the Shawan Test Site, Puding, Guizhou, China[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2018,242:21-33.
APA Hu, Yundi.,Liu, Zaihua.,Zhao, Min.,Zeng, Qingrui.,Zeng, Cheng.,...&Chen, Jia.(2018).Using deuterium excess, precipitation and runoff data to determine evaporation and transpiration: A case study from the Shawan Test Site, Puding, Guizhou, China.GEOCHIMICA ET COSMOCHIMICA ACTA,242,21-33.
MLA Hu, Yundi,et al."Using deuterium excess, precipitation and runoff data to determine evaporation and transpiration: A case study from the Shawan Test Site, Puding, Guizhou, China".GEOCHIMICA ET COSMOCHIMICA ACTA 242(2018):21-33.
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