High-Precision Calculation of the Proportions of Water with δ<sup>2</sup>H and δ<sup>18</sup>O, the Cumulative Effect of Evaporation in the Vertical Direction and Depleted δ<sup>2</sup>H and δ<sup>18</sup>O of the Shallow Soil Water Caused by Evaporation
Exploring the water sources taken up by plants is necessary for ecological protection. The purpose of this study was to determine the exact proportions of different water sources absorbed by herbaceous plant species in the wetland of Poyang Lake in an inland humid region. This identified the water s...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-08-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/14/17/2594 |
| _version_ | 1797492702922670080 |
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| author | Zhenyu Zeng Xiang Zhang Guoyan Pan Yang Xiao |
| author_facet | Zhenyu Zeng Xiang Zhang Guoyan Pan Yang Xiao |
| author_sort | Zhenyu Zeng |
| collection | DOAJ |
| description | Exploring the water sources taken up by plants is necessary for ecological protection. The purpose of this study was to determine the exact proportions of different water sources absorbed by herbaceous plant species in the wetland of Poyang Lake in an inland humid region. This identified the water sources patterns in wetlands and provide Poyang Lake managers information about the lake water level needed to sustain vegetative life. We analysed the deuterium isotope composition (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>2</mn></msup></semantics></math></inline-formula>H) and oxygen isotope composition (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>18</mn></msup></semantics></math></inline-formula>O) values in the stem water of dominant herbaceous plant during its different growth stages to explore the proportions of water sources in different growth stages by using the Phillips equation, and the results supported the accuracy. The results indicate that the groundwater should not be lower than 0.13 m, otherwise the Carex cinerascens may not be able to absorb it. In previous studies, the lower slopes and intercepts of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>2</mn></msup></semantics></math></inline-formula>H–<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>18</mn></msup></semantics></math></inline-formula>O were attributed to the secondary evaporation under the cloud, but we found that there is a cumulative evaporation effect in rainwater, soil water, and groundwater, which makes the slopes and the intercepts of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>2</mn></msup></semantics></math></inline-formula>H–<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>18</mn></msup></semantics></math></inline-formula>O relationship lines become lower from top to bottom. In this study, the final effect of evaporation on the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>2</mn></msup></semantics></math></inline-formula>H and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>18</mn></msup></semantics></math></inline-formula>O values of shallow soil water is depleting the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>2</mn></msup></semantics></math></inline-formula>H and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>18</mn></msup></semantics></math></inline-formula>O values of shallow soil water, which is different from previous studies. The <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>2</mn></msup></semantics></math></inline-formula>H and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>18</mn></msup></semantics></math></inline-formula>O values of groundwater varied little with changes of seasons and rainfalls. The <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>2</mn></msup></semantics></math></inline-formula>H–<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>18</mn></msup></semantics></math></inline-formula>O relationship lines established by various substances can also reflect the regulation of d-excess by large lakes through secondary sources. |
| first_indexed | 2024-03-10T01:06:32Z |
| format | Article |
| id | doaj.art-7d82c3424ff84dc7b4f6b98f5e3a2b4f |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T01:06:32Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-7d82c3424ff84dc7b4f6b98f5e3a2b4f2023-11-23T14:24:52ZengMDPI AGWater2073-44412022-08-011417259410.3390/w14172594High-Precision Calculation of the Proportions of Water with δ<sup>2</sup>H and δ<sup>18</sup>O, the Cumulative Effect of Evaporation in the Vertical Direction and Depleted δ<sup>2</sup>H and δ<sup>18</sup>O of the Shallow Soil Water Caused by EvaporationZhenyu Zeng0Xiang Zhang1Guoyan Pan2Yang Xiao3State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, No.8 Donghu South Road, Wuhan 430072, ChinaState Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, No.8 Donghu South Road, Wuhan 430072, ChinaState Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, No.8 Donghu South Road, Wuhan 430072, ChinaChangjiang Water Resources Protection Institute, Wuhan 430051, ChinaExploring the water sources taken up by plants is necessary for ecological protection. The purpose of this study was to determine the exact proportions of different water sources absorbed by herbaceous plant species in the wetland of Poyang Lake in an inland humid region. This identified the water sources patterns in wetlands and provide Poyang Lake managers information about the lake water level needed to sustain vegetative life. We analysed the deuterium isotope composition (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>2</mn></msup></semantics></math></inline-formula>H) and oxygen isotope composition (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>18</mn></msup></semantics></math></inline-formula>O) values in the stem water of dominant herbaceous plant during its different growth stages to explore the proportions of water sources in different growth stages by using the Phillips equation, and the results supported the accuracy. The results indicate that the groundwater should not be lower than 0.13 m, otherwise the Carex cinerascens may not be able to absorb it. In previous studies, the lower slopes and intercepts of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>2</mn></msup></semantics></math></inline-formula>H–<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>18</mn></msup></semantics></math></inline-formula>O were attributed to the secondary evaporation under the cloud, but we found that there is a cumulative evaporation effect in rainwater, soil water, and groundwater, which makes the slopes and the intercepts of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>2</mn></msup></semantics></math></inline-formula>H–<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>18</mn></msup></semantics></math></inline-formula>O relationship lines become lower from top to bottom. In this study, the final effect of evaporation on the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>2</mn></msup></semantics></math></inline-formula>H and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>18</mn></msup></semantics></math></inline-formula>O values of shallow soil water is depleting the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>2</mn></msup></semantics></math></inline-formula>H and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>18</mn></msup></semantics></math></inline-formula>O values of shallow soil water, which is different from previous studies. The <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>2</mn></msup></semantics></math></inline-formula>H and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>18</mn></msup></semantics></math></inline-formula>O values of groundwater varied little with changes of seasons and rainfalls. The <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>2</mn></msup></semantics></math></inline-formula>H–<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi mathvariant="sans-serif">δ</mi><mn>18</mn></msup></semantics></math></inline-formula>O relationship lines established by various substances can also reflect the regulation of d-excess by large lakes through secondary sources.https://www.mdpi.com/2073-4441/14/17/2594wetlandwater uptakestable isotopesmixing modelsource partitioningd-excess |
| spellingShingle | Zhenyu Zeng Xiang Zhang Guoyan Pan Yang Xiao High-Precision Calculation of the Proportions of Water with δ<sup>2</sup>H and δ<sup>18</sup>O, the Cumulative Effect of Evaporation in the Vertical Direction and Depleted δ<sup>2</sup>H and δ<sup>18</sup>O of the Shallow Soil Water Caused by Evaporation Water wetland water uptake stable isotopes mixing model source partitioning d-excess |
| title | High-Precision Calculation of the Proportions of Water with δ<sup>2</sup>H and δ<sup>18</sup>O, the Cumulative Effect of Evaporation in the Vertical Direction and Depleted δ<sup>2</sup>H and δ<sup>18</sup>O of the Shallow Soil Water Caused by Evaporation |
| title_full | High-Precision Calculation of the Proportions of Water with δ<sup>2</sup>H and δ<sup>18</sup>O, the Cumulative Effect of Evaporation in the Vertical Direction and Depleted δ<sup>2</sup>H and δ<sup>18</sup>O of the Shallow Soil Water Caused by Evaporation |
| title_fullStr | High-Precision Calculation of the Proportions of Water with δ<sup>2</sup>H and δ<sup>18</sup>O, the Cumulative Effect of Evaporation in the Vertical Direction and Depleted δ<sup>2</sup>H and δ<sup>18</sup>O of the Shallow Soil Water Caused by Evaporation |
| title_full_unstemmed | High-Precision Calculation of the Proportions of Water with δ<sup>2</sup>H and δ<sup>18</sup>O, the Cumulative Effect of Evaporation in the Vertical Direction and Depleted δ<sup>2</sup>H and δ<sup>18</sup>O of the Shallow Soil Water Caused by Evaporation |
| title_short | High-Precision Calculation of the Proportions of Water with δ<sup>2</sup>H and δ<sup>18</sup>O, the Cumulative Effect of Evaporation in the Vertical Direction and Depleted δ<sup>2</sup>H and δ<sup>18</sup>O of the Shallow Soil Water Caused by Evaporation |
| title_sort | high precision calculation of the proportions of water with δ sup 2 sup h and δ sup 18 sup o the cumulative effect of evaporation in the vertical direction and depleted δ sup 2 sup h and δ sup 18 sup o of the shallow soil water caused by evaporation |
| topic | wetland water uptake stable isotopes mixing model source partitioning d-excess |
| url | https://www.mdpi.com/2073-4441/14/17/2594 |
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