globalchange  > 气候变化与战略
DOI: 10.5194/hess-24-3627-2020
论文题名:
Investigating unproductive water losses from irrigated agricultural crops in the humid tropics through analyses of stable isotopes of water
作者: Mahindawansha A.; Külls C.; Kraft P.; Breuer L.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期:7
起始页码: 3627
结束页码: 3642
语种: 英语
Scopus关键词: Agricultural robots ; Drought ; Evaporation ; Floods ; Groundwater flow ; Hydraulics ; Irrigation ; Isotopes ; Reservoirs (water) ; Soil moisture ; Surface waters ; Tropics ; Water management ; Agricultural fields ; Crop diversification ; Crop rotation system ; Irrigation management ; Isotopic enrichment ; Isotopically enriched ; Stable isotopes of water ; Water management strategies ; Crops ; agricultural land ; crop plant ; crop rotation ; dry season ; growing season ; humid tropics ; irrigation system ; shallow soil ; soil water ; stable isotope ; wet season ; Zea mays
英文摘要: Reliable information on water flow dynamics and water losses via irrigation on irrigated agricultural fields is important to improve water management strategies. We investigated the effect of season (wet season and dry season), irrigation management (flooded and non-flooded), and crop diversification (wet rice, dry rice, and maize) on soil water flow dynamics and water losses via evaporation during plant growth. Soil water was extracted and analysed for the stable isotopes of water (2H and 18O). The fraction of evaporation losses were determined using the Craig-Gordon equation. For dry rice and maize, water in shallow soil layers (0 to 0.2 m) was more isotopically enriched than in deeper soil layers (below 0.2 m). This effect was less pronounced for wet rice but still evident for the average values at both soil depths and seasons. Soil water losses due to evaporation decreased from 40% at the beginning to 25% towards the end of the dry season. The soil in maize fields showed stronger evaporation enrichment than in rice during that time. A greater water loss was encountered during the wet season, with 80% at the beginning of the season and 60% at its end. The isotopic enrichment of ponding surface water due to evaporation was reflected in the shallow soils of wet rice. It decreased towards the end of both growing seasons during the wet and the dry season. We finally discuss the most relevant soil water flow mechanisms, which we identified in our study to be those of matrix flow, preferential flow through desiccation cracks, and evaporation. Isotope data supported the fact that unproductive water losses via evaporation can be reduced by introducing dry seasonal crops to the crop rotation system. © 2020 Copernicus GmbH. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162637
Appears in Collections:气候变化与战略

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作者单位: Mahindawansha, A., Institute for Landscape Ecology and Resources Management (ILR), Research Centre for Biosystems, Land Use and Nutrition (IFZ), Justus Liebig University Giessen, Giessen, 35392, Germany, Crop and Environmental Sciences Division (CESD), International Rice Research Institute (IRRI), Los Baños, 4030, Philippines; Külls, C., Department of Architecture and Civil Engineering, Technische Hochschule Lübeck, Lübeck, 23562, Germany; Kraft, P., Institute for Landscape Ecology and Resources Management (ILR), Research Centre for Biosystems, Land Use and Nutrition (IFZ), Justus Liebig University Giessen, Giessen, 35392, Germany; Breuer, L., Institute for Landscape Ecology and Resources Management (ILR), Research Centre for Biosystems, Land Use and Nutrition (IFZ), Justus Liebig University Giessen, Giessen, 35392, Germany, Center for International Development and Environmental Research (ZEU), Justus Liebig University Giessen, Giessen, 35390, Germany

Recommended Citation:
Mahindawansha A.,Külls C.,Kraft P.,et al. Investigating unproductive water losses from irrigated agricultural crops in the humid tropics through analyses of stable isotopes of water[J]. Hydrology and Earth System Sciences,2020-01-01,24(7)
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