Spatiotemporal variation for soil salinity of field land under long-term mulched drip irrigation

A field that has been irrigated with mulched drip technique for 13 years was selected for researching on the effects of the long-term utilization of mulched drip irrigation technique on the evolution of soil salinity distribution. Based on the spatiotemporal variation of soil salinity distribution, the soil salinity evolution characteristics were analyzed. It was found that the soil salinity of the field was decreased substantially during the initial stage of utilizing the mulched drip irrigation, then the decrease rang was declined with the using of irrigation technique; ultimately a stable soil salinity was obtained in the field. After 13 years irrigation with mulched drip technique, soil salinity in 0-100 cm soil layer of the researched field had been declined from 20-30 to 5 g/kg, and that below 20 cm soil depth of the field margin was stable at 5-10 g/kg, which was larger than that in the corresponding soil layer of the field. But soil salt assembled at the surface of the field margin resulted in that soil salinity at the surface of field margin was larger than 20 g/kg. The salinity of entire soil layer in the field land could not be increased by the salty accumulation at soil wetting front. The study provides a reference for the reasonable use of mulched drip irrigation technique.