Modeling integrated impacts of agro-hydrological interventions on blue and green water and crop yield in SWAT+

IF 5 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2025-09-22 DOI:10.1016/j.ejrh.2025.102783

Temesgen Gashaw Tarkegn , Pieter R. van Oel , Abebe D. Chukalla , Ram Lakhan Ray , Gebrekidan Worku Tefera , Amare Haileslassie , Meron Teferi Taye , Abeyou W. Worqlul , Enyew Adgo , Amare Bantider , Yihun T. Dile

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引用次数: 0

Abstract

Study region

Lake Tana sub-basin, Ethiopia

Study focus

This study evaluates integrated impacts of agro-hydrological interventions on blue and green water, and crop yield using SWAT+. The model was calibrated and validated with monthly streamflow data and long-term average maize yield. Assessed interventions included soil/stone bunds, conservation tillage, early and late planting, and fertilizer applications at 100 kg/ha and 200 kg/ha, using historical climate data from 1992–2021.

New hydrologic insights

SWAT+ is suitable for simulating hydrology and crop yield in the study area. At areal average scale, early and late planting reduced blue water by 0.3 % while increasing green water flow (GWF) by 0.4 %. Other practices had no discernible effect on blue water or GWF. Green water storage (GWS) increased under early planting (3.3 %) and conservation tillage (0.8 %) but declined with late planting (9.1 %). Crop yield increased with early planting (12.1 %), fertilizer application at 100 kg/ha and 200 kg/ha (16.0 % and 24.5 %, respectively), and the adoption of soil/stone bunds (0.4 %). Conversely, late planting and conservation tillage reduced crop yields. Spatial analysis revealed that intervention effects varied across regions in water and crop outcomes. Certain practices like early planting, increased crop yields but also led to unintended reductions in blue water. These findings highlight the need for integrated, region-specific agro-hydrological strategies to balance agricultural productivity with sustainable water resource management.

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模拟SWAT+地区农业水文干预对蓝水和绿水以及作物产量的综合影响

本研究利用SWAT+评估了农业水文干预措施对蓝水和绿水以及作物产量的综合影响。用月度河流流量数据和长期平均玉米产量对模型进行了校准和验证。评估的干预措施包括土壤/石头带、保护性耕作、早期和晚期种植，以及使用1992-2021年的历史气候数据，分别施用100 kg/ha和200 kg/ha的肥料。swat +适用于模拟研究区水文和作物产量。在面积平均尺度上，早、晚种植减少了0.3 %的蓝水，增加了0.4 %的绿水流量。其他做法对蓝水或GWF没有明显的影响。绿水蓄积（GWS）在早播（3.3 %）和保护性耕作（0.8 %）下增加，在晚播（9.1 %）下下降。早播（12.1% %）、施肥分别为100 kg/ha和200 kg/ha（分别为16.0% %和24.5% %）和采用土石带（0.4 %）可提高作物产量。相反，晚播和保护性耕作降低了作物产量。空间分析显示，不同区域的干预效果在水和作物方面存在差异。某些做法，如早期种植，增加了作物产量，但也导致了蓝水的意外减少。这些发现突出表明，需要制定针对特定区域的综合农业水文战略，以平衡农业生产力与可持续水资源管理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.