气候变化领域集成服务门户(CCPortal): Investigating unproductive water losses from irrigated agricultural crops in the humid tropics through analyses of stable isotopes of water

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DOI	10.5194/hess-24-3627-2020
	Investigating unproductive water losses from irrigated agricultural crops in the humid tropics through analyses of stable isotopes of water
	Mahindawansha A.; Külls C.; Kraft P.; Breuer L.
发表日期	2020
ISSN	1027-5606
起始页码	3627
结束页码	3642
卷号	24 期号:7
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.
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
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159347
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
推荐引用方式 GB/T 7714	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],2020,24(7).
APA	Mahindawansha A.,Külls C.,Kraft P.,&Breuer L..(2020).Investigating unproductive water losses from irrigated agricultural crops in the humid tropics through analyses of stable isotopes of water.Hydrology and Earth System Sciences,24(7).
MLA	Mahindawansha A.,et al."Investigating unproductive water losses from irrigated agricultural crops in the humid tropics through analyses of stable isotopes of water".Hydrology and Earth System Sciences 24.7(2020).