Simulation of deficit irrigation with saline water for spring maize based on SWAP model
YUAN Chengfu1,2, FENG Shaoyuan1,3*, HUO Zailin3,WANG Qingming4
1. College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China; 2. Jiangxi Water Resources Institute, Nanchang, Jiangxi 330013, China; 3. Centre for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China; 4. Department of Water Resources, Institute of Water Resources and Hydropower Research, Beijing 100038, China
Abstract：In order to explore the appropriate deficit irrigation with saline water management mode for spring maize growth in the Shiyang River Basin of Gansu province, the SWAP model was used to simulate soil water and salinity balance, relative spring maize yield and relative water use efficiency under different irrigation modes, and also the long-term effects of soil water-salt dynamics were also predicted. The simulated results indicate that the optimal irrigation management mode of spring maize is to irrigate four times with total amount of 408 mm for irrigation water with 0.71 g/L and 3.00 g/L during the growing season of spring maize. The two irrigation modes can achieve the aim of saving irrigation water, improving crop yield and water use efficiency, and reducing the soil salt accumulation. The long-term simulation of soil water-salt dynamics indicates that the soil water content and soil salt content can remain relatively stable for the simulation period of time in the optimal irrigation mode of spring maize under winter irrigation. The soil water content increases with the increase of soil depth at the same soil layer in different years. The soil salt content mainly accumulates at the 40-80 cm soil layer under fresh water irrigation of 0.71 g/L and accumulates at the 10-40 cm soil layer under brackish water irrigation of 3.00 g/L. Five-year simulation shows that the irrigation water with 0.71 g/L and 3.00 g/L will not result in soil secondary salinization.
袁成福,冯绍元,*,霍再林,王庆明. 基于SWAP模型的春玉米咸水非充分灌溉模拟[J]. 排灌机械工程学报, 2020, 38(4): 396-402.
YUAN Chengfu,FENG Shaoyuan,*,HUO Zailin,WANG Qingming. Simulation of deficit irrigation with saline water for spring maize based on SWAP model. Journal of Drainage and Irrigation Machinery Engin, 2020, 38(4): 396-402.
