Optimization of Planting Structure under the Background of Water-Saving Irrigation in Shiyang River Basin, China

Abstract

Adjusting the agricultural planting structure is one of the important means to realize agricultural water-saving, especially in arid inland river basin. In this paper, taking Shiyang River Basin as an example, on the basis of determining the crop water production function, a multi-objective optimization model was constructed, which comprehensively considered the maximization of economic benefits, the green water utilization rate and ecological benefits. The optimized planting structure was obtained by using GAMS (General Algebraic Modeling System) model solver. The results showed that: The common features of the three level years after optimization is that the sown area proportion of wheat, tubers, vegetables, fruits and cotton all increased, of which the sown area of fruits increased most by 5.30 × 10 4 ha. However, the sown area proportion of corn and oil-bearing crops decreased, of which the sown area of corn decreased most by 8.90 × 10 4 ha. Comparing of three level years, it is found that the impact of climate change on planting structure adjustment was relatively weak. With the decrease of precipitation, it is suggested to slightly decrease the sown area of wheat but slightly increase the sown area of tubers. The optimization results of planting structure were different in different counties. The average contribution rate of planting structure adjustment to total water-saving was 73.32%, indicating that planting structure adjustment was the key to water-saving. The water consumption of the same crop was different in different counties.

Research on the application of water measuring technology in water-saving irrigation

“…pointed out that the adjustment of the agrarian planting structure is one of the essential means of water-saving irrigation, which optimized the planting structure in arid inland areas and realized the efficient use of freshwater resources through a multi-objective optimization model that considered the maximization of economic benefits, freshwater utilization, and ecological benefits [23]. Huabin, Z. et al proposed to improve the development of rice cultivation technology under nitrogen-reducing and water-saving irrigation technology, which promotes the economical use of water resources and environmental friendliness [24].…”