A delta H-2 offset correction method for quantifying root water uptake of riparian trees
文献类型：期刊论文
| 作者 | Li, Yue1,3; Ma, Ying1,3 ; Song, Xianfang1,3; Wang, Lixin2; Han, Dongmei1,3
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| 刊名 | JOURNAL OF HYDROLOGY
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| 出版日期 | 2021-02-01 |
| 卷号 | 593页码:13 |
| 关键词 | Root water uptake delta H-2 offset MixSIAR model Potential water source line Riparian tree |
| ISSN号 | 0022-1694 |
| DOI | 10.1016/j.jhydrol.2020.125811 |
| 通讯作者 | Ma, Ying(maying@igsnrr.ac.cn) |
| 英文摘要 | Root water uptake plays an important role in water cycle in Groundwater-Soil-Plant-Atmosphere-Continuum. Stable isotopes (delta H-2 and delta O-18) are effective tools to quantify the use of different water sources by plant roots. However, the widespread delta H-2 offsets of stem water from its potential sources due to delta H-2 fractionation during root water uptake result in conflicting interpretations of water utilization using stable isotopes. In this study, a potential water source line (PWL), i.e., a linear regression line between delta O-18 and delta H-2 data of both soil water at different depths and groundwater, was proposed to correct delta H-2 offsets of stem water. The PWL-corrected delta H-2 was determined by subtracting the deviation between delta H-2 in stem water and PWL from the original value. The MixSIAR model coupled with seven types of input data (i.e. various combinations of single or dual isotopes with uncorrected or corrected delta H-2 data by PWL or soil water line (SWL)) were used to determine seasonal variations in water uptake patterns of riparian tree of Salix babylonica (L.) along the Jian and Chaobai River in Beijing, China. These methods were evaluated via three criteria including Akaike Information Criterion (AIC), Bayesian Information Criterion (BIC) and root mean square error (RMSE). Results showed that different types of input data led to considerable differences in the contributions of soil water at upper 30 cm (9.9-57.6%) and below 80 cm depths (29.0-76.4%). Seasonal water uptake patterns were significantly different especially when delta H-2 offset was pronounced (p < 0.05). The dual-isotopes method with uncorrected delta H-2 underestimated the contributions of soil water in the 0-30 cm layer (by 30.4%) and groundwater (by 56.3%) compared to that with PWL-corrected delta H-2. The PWL correction method obtained a higher groundwater contribution (mean of 29.5%) than that estimated by the SWL correction method (mean of 24.5%). The MixSIAR model using dual-isotopes with PWL-corrected delta H-2 produced the smallest AIC (94.1), BIC (91.9) and RMSE values (4.8%) than other methods (94.9-101.7, 92.6-99.5 and 5.3-12.4%, respectively), which underlined the best performance of PWL correction method. The present study provides crucial insights into quantifying accurate root water uptake sources even if delta H-2 offset exists. |
| WOS关键词 | STABLE-ISOTOPE ANALYSIS ; SOIL-WATER ; SEASONAL-VARIATIONS ; UPTAKE DYNAMICS ; DRY SOILS ; PLANT ; GROUNDWATER ; HYDROGEN ; EVAPOTRANSPIRATION ; TRANSPIRATION |
| 资助项目 | National Natural Science Foundation of China[41730749] ; National Natural Science Foundation of China[41671027] ; Division of Earth Sciences of National Science Foundation[EAR-1554894] |
| WOS研究方向 | Engineering ; Geology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000639853400031 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China ; Division of Earth Sciences of National Science Foundation |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/161676]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Ma, Ying |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 2.Indiana Univ Purdue Univ Indianapolis IUPUI, Dept Earth Sci, Indianapolis, IN 46202 USA 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Yue,Ma, Ying,Song, Xianfang,et al. A delta H-2 offset correction method for quantifying root water uptake of riparian trees[J]. JOURNAL OF HYDROLOGY,2021,593:13. |
| APA | Li, Yue,Ma, Ying,Song, Xianfang,Wang, Lixin,&Han, Dongmei.(2021).A delta H-2 offset correction method for quantifying root water uptake of riparian trees.JOURNAL OF HYDROLOGY,593,13. |
| MLA | Li, Yue,et al."A delta H-2 offset correction method for quantifying root water uptake of riparian trees".JOURNAL OF HYDROLOGY 593(2021):13. |
入库方式： OAI收割
来源：地理科学与资源研究所
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