江淮丘陵塘坝灌区作物种植结构优化调整模型

Model for optimization of crop-planting structure adjustment in pond-irrigation area of Jianghuai Hilly Region

鉴于江淮丘陵塘坝灌区作物种植结构优化调整问题的复杂性与重要性,依托肥东八斗灌溉试验站试验成果,通过塘坝灌区降雨径流模拟,进行农田灌溉水量平衡分析,构建了塘坝灌区多目标多变量作物种植结构优化调整模型,并运用加速遗传算法进行模型求解,优化确定了研究区现状9.32万m^3/km^2塘坝容量下合理的作物种植比例,具体为:就午季作物水稻而言,降雨频率为P≥90%时,适宜种植比例为0.11;降雨频率为75%≤P<90%时,适宜种植比例为0.21;降雨频率为50%≤P<75%时,适宜种植比例为0.36;降雨频率为20%≤P<50%时,适宜种植比例为0.54;降雨频率为P<20%时,适宜种植比例为0.65。研究成果可为江淮丘陵塘坝灌区种植结构调整与灌溉制度的制定提供科技支撑,具有重要的实际指导意义和推广应用价值。

In view of the complexity and importance of the optimization of the crop-planting structure adjustment in the pond-irrigation area of Jianghuai Hilly Region,an analysis on farmland irrigation water balance is carried out through the rainfall-runoff simulation of the pond-irrigation area in accordance with the experiment result from Feidong Badou Irrigation Experiment Station,and then a multi-objective and multi-variable model for the optimized adjustment of crop-planting structure in the pond-irrigation area is established; from which the reasonable crop-planting proportion under the status of the study area with the pond capacity of 9. 32 × 10~4 m^3/km^2 is optimized,specifically speaking,the suitable planting proportion is 0. 11,when rainfall frequency is P≥90%; the suitable planting proportion is 0. 21,when rainfall frequency is 75% ≤P 90%; the suitable planting proportion is0. 36,when rainfall frequency is 50% ≤P 75%; the suitable planting proportion is 0. 54,when rainfall frequency is 20% ≤P 50% and the suitable planting proportion is 0. 65,when rainfall frequency is P 20% for the summer crop—rice. The study result can provide scientific support for adjusting the corp-planting structure and making the irrigation system for the pond-irrigation area of Jianghuai Hilly Region,thus has an important practical guiding significance with certain popularization and application value.