Effect of Salinity on Soil Evaporation and Its Simulation

To qualify the effect of salinity on soil evaporation,the soil water characteristic curves at soil salt contents of 0.2%,0.6%,1.0% and 5.0% were measured respectively,and soil evaporation experiments with different salt contents by using soil columns were performed.A modified HYDRUS-1Dprogram was used to simulate the evaporation process with considering the effect of salinity on soil water characteristic curve.The results showed that:1soil at different salt contents had different soil moisture characteristic curve,when the soil water content was lower than 30%,the effect of soil salt content was significant,and the lower soil water content was,the greater effect of the salt content was;2Soil at different salt contents had different soil evaporation rate,and with the increasing of the salt content,the evaporation rate decreased significantly;3When the effect of salinity on soil water characteristic curve was considered,the simulation results better fitted with the measured values.