Prediction and Research of Soil Environment Effect Under Light-Saline Water Irrigation.

There are many researches on salt water irrigation technology, salt water utilization pattern, impact on crop yield and quality using salt water irrigation, adaptability of salt water irrigation, and salt water irrigation amelioration of soils, etc. In recent years, environmental effect caused by light salt water irrigation at the regional scale is concerned. Based on the field experiment in the Inner Mongolia Hongwei testing station, this paper introduced the SWAP model and discussed the conversion relation of soil water salt balance elements and soil salt accumulation trends on the conditions of light salt water irrigation. The prediction results indicated that both in the leaching quota and in the normal irrigation could lead to the increase of soil salt. But, in the leaching quota, the soil salt in the wheat model decreased 6.5%, 0.7% in the sunflower model, and 4% in the maize model comparing with the corresponding values in the normal irrigation quota. The decreasing rate of yield in the wheat, sunflower and maize decreased 1%, 2%, and 6%, respectively. On the condition of the saline water irrigation, unchanging the irrigation quota and the irrigation water concentration, the soil salt accumulation decreased as trend goes. After about 10 years, soil salt could reach the recharging and discharging balance. At that time, the soil salt content was 0.185 2 mg·cm-3, and increased amount was 0.082 2 mg·cm-3. But the soil still was belongs to the light salinity, and the light saline water irrigation couldn′t affect the soil water environment significantly. Through analyzing the simulation results, this paper indicated that light salt water irrigation was feasible in arid or semi-arid regions.