| 王少丽,许 迪,方树星,P. Hollanders.水管理策略对土壤水盐动态和区域地下排水影响的模拟评价[J].水利学报,2005,36(7):0799-0805 |
| 水管理策略对土壤水盐动态和区域地下排水影响的模拟评价 |
| Effects of water management strategies on soil water salt movement and subsurface drainage |
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| DOI： |
| 中文关键词: 水盐动态 地下水调控深度 灌溉制度 地下排水 水管理 |
| 英文关键词: soil water-salt dynamics controlled water table irrigation schedule subsurface drainage water management |
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| 摘要点击次数: 2593 |
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| 中文摘要: |
| 以宁夏惠农灌区平罗试验区为对象，基于田间观测与灌溉试验结果，在田间尺度采用SWAP模型开展不同地下水调控深度与灌溉制度相结合的水管理方案下土壤水盐动态的模拟，在区域尺度采用MODFLOW模型进行不同水管理方案对区域地下排水量影响的模拟评价，据此分析土壤水盐动态过程和农田排水系统的作用，对拟定的各种水管理方案进行评价。结果表明，现状灌溉用水量虽有助于减少表土盐分积聚，但地下排水量占灌溉用水量的39.4%；现状灌溉用水量减少50%时，浅埋地下水位会加重表土积盐；现状灌溉用水量减少25%时，作物根区没有产生明显的积盐，地下排水量减少31.4%。因此，较为合理的水管理方案是将现状灌水量减少25%的同时将地下水埋深控制在70cm以下，才能达到节水、增产、改善农田水土环境的目标。 |
| 英文摘要: |
| Based on the data obtained from field observation and irrigation experiment in Pingluo plot of Huinong Irrigation District, Ningxia Autonomous Region, China, the Soil Water Atmosphere Plant (SWAP) model was used to simulate the soil water-salt dynamics in field and MODFLOW model was used to simulate the regional subsurface drainage for different water management strategies with combined water table and irrigation schedule. The impacts of water management strategies on field water-salt dynamics and regional subsurface drainage were evaluated. The results showed that the subsurface drainage flow accounted for 39.4% of irrigation application, although the available irrigation application was beneficial to the reduction of salt accumulation in upper layer soil. When irrigation application decreased by 50% the salt accumulation in upper layer of soil became serious under the condition of shallow water table. However, when irrigation application decreased by 25% the salt accumulation in root zone will not be obvious and the subsurface drainage flow will decrease by 31.4%. Thus, the appropriate water management strategy should be that the water table was controlled less than 70cm and the available irrigation application decreased by 25%. In this case, the objectives of water saving, production increasing and water soil environment improving will be achieved. |
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