Optimization of agricultural planting structure under multi-objective regulation of water resources

Abstract

Focusing on the problems such as adjustment of planting structure, imbalance of water supply and serious over-extraction of groundwater in Jinghui Canal Irrigation District, a multi-objective water regulation model was established for finding coordinate development among ecological benefits, social benefits and economic benefits to seek the reasonable program of water resource utilization and agricultural planting. When the ecological benefit was optimal, the total area of crop planting was 6.105 × 104 hm2, the area of grain crops, fruit trees and vegetables planting was 3.073 × 104 hm2, 1.444 × 104 hm2 and 1.592 × 104 hm2 respectively. Under this scenario, the irrigation water requirement was 35986.87 × 104 m3/a. The surface water supply was 32268.42 × 104 m3/a and the compensation of groundwater supply was 3718.45 × 104 m3/a. Therefore, when the social benefit was optimal, the total area of crop planting was 6.57 × 104 hm2, the area of grain crops, fruit trees and vegetables planting was 3.684 × 104 hm2, 1.214 × 104 hm2 and 1.673 × 104 hm2 respectively. Under this scenario, the irrigation water requirement was 39571.20 × 104 m3/a. The surface water supply was 33438.65 × 104 m3/a and the compensation of groundwater supply was 6132.54 × 104 m3/a. The agricultural planting structure between the two can serve as a reasonable control interval, and provide a reasonable resource utilization and agricultural planting scheme for the future development of Jinghui Canal Irrigation District.