High-frequency water isotopic analysis using an automatic water sampling system in rice-based cropping systems
High-resolution data on a field scale is very important for improving our understanding of hydrological processes. This is particularly the case for water-demanding agricultural production systems such as rice paddies, for which water-saving strategies need to be developed. Here we report on the app...
| Autores principales: | , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
MDPI
2018
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| Acceso en línea: | https://hdl.handle.net/10568/164799 |
| _version_ | 1855543064134680576 |
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| author | Mahindawansha, Amani Breuer, Lutz Chamorro, Alejandro Kraft, Philipp |
| author_browse | Breuer, Lutz Chamorro, Alejandro Kraft, Philipp Mahindawansha, Amani |
| author_facet | Mahindawansha, Amani Breuer, Lutz Chamorro, Alejandro Kraft, Philipp |
| author_sort | Mahindawansha, Amani |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | High-resolution data on a field scale is very important for improving our understanding of hydrological processes. This is particularly the case for water-demanding agricultural production systems such as rice paddies, for which water-saving strategies need to be developed. Here we report on the application of an in situ, automatic sampling system for high-resolution data on stable isotopes of water (18O and 2H). We investigate multiple rice-based cropping systems consisting of wet rice, dry rice and maize, with a single, but distributed analytical system on a sub-hourly basis. Results show that under dry conditions, there is a clear and distinguishable crop effect on isotopic composition in groundwater. The least evaporative affected groundwater source is that of maize, followed by both rice varieties. Groundwater is primarily a mixture of irrigation and rainwater, where the main driver is irrigation water during the dry season and rainwater during the wet season. Stable isotopes of groundwater under dry season maize react rapidly on irrigation, indicating preferential flow processes via cracks and deep roots. The groundwater during the dry season under wet and dry rice fields is dominated at the beginning of the growing season mainly by the input of rainwater; later, the groundwater is more and more replenished by irrigation water. Overall, based on our data, we estimate significantly higher evaporation (63–77%) during the dry season as compared to the wet season (27–36%). We also find, for the first time, significant sub-daily isotopic variation in groundwater and surface ponded water, with an isotopic enrichment during the daytime. High correlations with relative humidity and temperature, explain part of this variability. Furthermore, the day-night isotopic difference in surface water is driven by the temperature and relative humidity; however, in groundwater, it is neither driven by these factors. |
| format | Journal Article |
| id | CGSpace164799 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| publisher | MDPI |
| publisherStr | MDPI |
| record_format | dspace |
| spelling | CGSpace1647992025-12-08T09:54:28Z High-frequency water isotopic analysis using an automatic water sampling system in rice-based cropping systems Mahindawansha, Amani Breuer, Lutz Chamorro, Alejandro Kraft, Philipp High-resolution data on a field scale is very important for improving our understanding of hydrological processes. This is particularly the case for water-demanding agricultural production systems such as rice paddies, for which water-saving strategies need to be developed. Here we report on the application of an in situ, automatic sampling system for high-resolution data on stable isotopes of water (18O and 2H). We investigate multiple rice-based cropping systems consisting of wet rice, dry rice and maize, with a single, but distributed analytical system on a sub-hourly basis. Results show that under dry conditions, there is a clear and distinguishable crop effect on isotopic composition in groundwater. The least evaporative affected groundwater source is that of maize, followed by both rice varieties. Groundwater is primarily a mixture of irrigation and rainwater, where the main driver is irrigation water during the dry season and rainwater during the wet season. Stable isotopes of groundwater under dry season maize react rapidly on irrigation, indicating preferential flow processes via cracks and deep roots. The groundwater during the dry season under wet and dry rice fields is dominated at the beginning of the growing season mainly by the input of rainwater; later, the groundwater is more and more replenished by irrigation water. Overall, based on our data, we estimate significantly higher evaporation (63–77%) during the dry season as compared to the wet season (27–36%). We also find, for the first time, significant sub-daily isotopic variation in groundwater and surface ponded water, with an isotopic enrichment during the daytime. High correlations with relative humidity and temperature, explain part of this variability. Furthermore, the day-night isotopic difference in surface water is driven by the temperature and relative humidity; however, in groundwater, it is neither driven by these factors. 2018-09-25 2024-12-19T12:54:19Z 2024-12-19T12:54:19Z Journal Article https://hdl.handle.net/10568/164799 en Open Access MDPI Mahindawansha, Amani; Breuer, Lutz; Chamorro, Alejandro and Kraft, Philipp. 2018. High-frequency water isotopic analysis using an automatic water sampling system in rice-based cropping systems. Water, Volume 10 no. 10 p. 1327 |
| spellingShingle | Mahindawansha, Amani Breuer, Lutz Chamorro, Alejandro Kraft, Philipp High-frequency water isotopic analysis using an automatic water sampling system in rice-based cropping systems |
| title | High-frequency water isotopic analysis using an automatic water sampling system in rice-based cropping systems |
| title_full | High-frequency water isotopic analysis using an automatic water sampling system in rice-based cropping systems |
| title_fullStr | High-frequency water isotopic analysis using an automatic water sampling system in rice-based cropping systems |
| title_full_unstemmed | High-frequency water isotopic analysis using an automatic water sampling system in rice-based cropping systems |
| title_short | High-frequency water isotopic analysis using an automatic water sampling system in rice-based cropping systems |
| title_sort | high frequency water isotopic analysis using an automatic water sampling system in rice based cropping systems |
| url | https://hdl.handle.net/10568/164799 |
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