Experimental Study on Soil Moisture Evaporation in Western Loess Plateau

We have systematically studied the soil water evaporation of planted vegetation in the southern and northern mountains of Lanzhou city.In experiment,we controlled soil moisture by methods of artificial rainfall and restoring water in soil post;soil treatments included non-cover,mealie haulm cover and gravel cover. The result indicated that soil cover had significant effect on soil water evaporation.For non-cover there was positive correlation between soil water evaporation and soil moisture,that is more soil water and more soil water evaporation. The evaporation dynamic was different in the three soil treatments during the experimental observation for 33 days.The evaporation process had no concentrated fastigium of soil water evaporation in cover treatments,but in non-cover it concentrated in the first 10 days.Besides,the regression analysis on accumulative soil evaporation and lasting time showed that there were obvious difference of accumulative evaporation among various treatments.