Differences in watershed evaporation indicated by hydrogen and oxygen single and dual isotopes: Evidence from controlled simulation tests under different land uses
文献类型：期刊论文
| 作者 | Hu, Yundi6,7; Fan, Hongdai6,7; Zhao, Min4,5; Hu, Deyong3; Bao, Qian2; Zeng, Cheng4,5; Li, Dong5; Zhang, Yi1,5; Xia, Fan5; Cai, Xianli4,5 |
| 刊名 | JOURNAL OF HYDROLOGY
 |
| 出版日期 | 2023-02-01 |
| 卷号 | 617页码:12 |
| 关键词 | Watershed evaporation Hydrogen and oxygen isotopes Dual isotopes D -excess Lc -excess Land use |
| ISSN号 | 0022-1694 |
| DOI | 10.1016/j.jhydrol.2023.129142 |
| 通讯作者 | Hu, Yundi(hydhydro@163.com) ; Zhou, Zhongfa(fa6897@163.com) |
| 英文摘要 | Partitioning watershed evapotranspiration into evaporation and transpiration is essential for studying the water-carbon cycle, and the key step in this partitioning is to calculate watershed evaporation based on isotopic indexes. The 818O and 82H single isotopes and d-excess or lc-excess dual isotopes derived from 818O and 82H are widely used for this purpose. Although 818O, 82H, and d-excess have different characteristics, few studies have assessed how these differences influence the usefulness of these isotopes as indicators of watershed evaporation. Here, we simulated five watersheds with different land uses and degrees of evaporation in a region of Southwest China with a subtropical monsoon climate. We then investigated differences in the ability of the isotopic indexes to indicate watershed evaporation over two hydrological years. We found that d-excess and lc-excess dual isotopes were better indicators of watershed evaporation than 818O and 82H single isotopes. This is because the 818O and 82H in precipitation are easily influenced by rainout during the rainy season, when groundwater is primarily recharged. They are more variable than d-excess and lc-excess, which leads to 818O and 82H in groundwater being more sensitive to changes in the isotopic signal input in precipitation. This probably interferes with, or even masks watershed evaporation signals carried by 818O and 82H. The annual mean isotopic compositions were more depleted in groundwaters (818O = - 8.7 %o to - 8.5 %o, 82H = - 61.9 %o to - 58.7 %o) than in precipitation (818O = - 8.3 %o, 82H = - 54.3 %o) from November 2015 to October 2016; these compositions fail to support the isotopic enrichment of groundwater compared with that of precipitation. Evaporation rates over two years derived from d-excess dual isotopes agreed well with those from the water balance in bare-rock and bare-soil lands, which had no data from plants available for verification. Compared with hydrogen and oxygen single isotopes, their dual isotopes reflected watershed evaporation more accurately, especially in Asian monsoon regions. |
| WOS关键词 | STABLE-ISOTOPES ; DEUTERIUM EXCESS ; RIVER-BASIN ; TRANSPIRATION ; EVAPOTRANSPIRATION ; PRECIPITATION ; GROUNDWATER ; GUIZHOU ; COVER ; FRACTIONATION |
| 资助项目 | National Natural Science Foundation of China[42072278] ; National Natural Science Foundation of China[42177248] ; National Natural Science Foundation of China[42161048] ; National Natural Science Foundation of China[41807366] ; Guizhou Science and Technology Supporting Plan[2020-4Y013] ; Guizhou Normal University[[2021] 26] |
| WOS研究方向 | Engineering ; Geology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000926256900001 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China ; Guizhou Science and Technology Supporting Plan ; Guizhou Normal University |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/189971]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Hu, Yundi; Zhou, Zhongfa |
| 作者单位 | 1.Guizhou Inst Technol, Sch Resources & Environm Engn, Guiyang 550025, Peoples R China 2.Sichuan Normal Univ, Key Lab Land Resources Evaluat & Monitoring Southw, Minist Educ, Chengdu 610066, Peoples R China 3.Guizhou Bur Geol & Mineral Explorat & Dev, 105 Geol Team, Guiyang 550018, Peoples R China 4.Chinese Acad Sci, Puding Karst Ecosyst Res Stn, Chinese Ecosyst Res Network, Puding 562100, Peoples R China 5.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China 6.State Key Lab Incubat Base Karst Mt Ecol Environm, Guiyang 550025, Peoples R China 7.Guizhou Normal Univ, Sch Geog & Environm Sci, Guiyang 550025, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu, Yundi,Fan, Hongdai,Zhao, Min,et al. Differences in watershed evaporation indicated by hydrogen and oxygen single and dual isotopes: Evidence from controlled simulation tests under different land uses[J]. JOURNAL OF HYDROLOGY,2023,617:12. |
| APA | Hu, Yundi.,Fan, Hongdai.,Zhao, Min.,Hu, Deyong.,Bao, Qian.,...&Zhou, Zhongfa.(2023).Differences in watershed evaporation indicated by hydrogen and oxygen single and dual isotopes: Evidence from controlled simulation tests under different land uses.JOURNAL OF HYDROLOGY,617,12. |
| MLA | Hu, Yundi,et al."Differences in watershed evaporation indicated by hydrogen and oxygen single and dual isotopes: Evidence from controlled simulation tests under different land uses".JOURNAL OF HYDROLOGY 617(2023):12. |
入库方式： OAI收割
来源：地理科学与资源研究所
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