The Effect of Soil Texture and Quantity and Quality of Irrigation Water on Soil Moisture Evaporation in the Hinterland of the Taklimakan Desert

In order to reveal the relationship between soil moisture evaporation and soil texture and quantity and quality of irrigation water in extreme drought desert,and support the water-saving irrigation of protection forest and the irrigation system optimization,the artificial simulation evaporation experiments in the hinterland of the Taklimakan Desert was conducted.The results show that:soil physico-chemical properties including soil texture and soil moisture content and status of irrigation water salinity played a key role in soil evaporation.Comparing to loam and sandy loam soil,the sandy soil had higher cumulative evaporation and lower water retention and conservation capacity.In the condition of sufficient irrigation(sufficient supply of water),the cumulative evaporation changed in linear manner with time.However,as for non-sufficient water supply,it changed in logarithmic manner.The accumulated soil moisture evaporation was positively correlated with the initial moisture content,and the soil cumulative evaporation in each treatment increased in logarithmic manner with time.In some cases,the soil cumulative evaporation was negatively correlated with the irrigation water salinity,namely the higher irrigation water salinity leading to lower soil cumulative evaporation.