Analysis of soil water and salt transport patterns under spring irrigation drenching and pipe draining conditions
To explore the law of soil water and salt transportation under coordinated irrigation and drainage conditions and propose a suitable culvert pipe project layout.In this study,we analyzed the distribution of soil water and salt transport and the changes in soil desalination under drainage and salinity removal conditions by combining spring irrigation and drenching with the layout of culvert pipes(four burial depths:1.2,1.4,1.6 m,and 1.8 m;and three spacings:20,30 m,and 40 m)in the demonstration area of Jiashi County,Xinjiang,in 2024.The results showed that during the spring irrigation drenching period,the drainage volume of the culvert pipe in each plot showed a gradually decreasing trend,and the mineralization degree showed a gradually increasing trend.The size of the pipe spacing was negatively correlated with the amount of salt discharged from the pipe.The average soil water content at depths of 0-40 cm before and after spring irrigation was 0.30 cm3·cm-3,and the soil water content below 160 cm was close to saturation at 0.44 cm3·cm-3.The average salinity varied from 4.33 to 12.12 g·kg-1 in 0-40 cm soil layer and from 2.51 to 8.49 g·kg-1 in 40-200 cm soil layer.This indicates that the soil profile water content shows an overall trend of gradual increase with soil depth.Soil profile salinity gradually decreases with depth.The average desalination rates were 29.06%,31.97%,34.45%,and 36.20%for 1.2,1.4,1.6 m,and 1.8 m culvert depths,respectively,and 36.46%,33.13%and 29.17%for 20,30 m and 40 m culvert spacing,respectively.It indicates that the soil desalination rate increases with increasing culvert burial depth and decreases with increasing culvert spacing.Combined with the desalination rate of the soil after washing and the cost of laying the culvert pipe,this study recommends the use of a 1.8 m burial depth and 30 m spacing in this area and similar areas is more appropriate.The study shows that spring irrigation drenching combined with concealed pipe technology can effectively reduce soil salinity,thus effectively managing the problem of soil salinization and promoting the sustainable development of agriculture in Xinjiang.
spring irrigationconcealed pipe drainage and saltingwater and salt transportdesalination rateirrigation and drainage synergy
万方数据
维普
