A study on soil moisture under different vegetations in loess hilly region

Based on the data collected by random survey in loess hilly region,the characteristics of soil moisture under different vegetations were analyzed.The results showed that there were considerable differences of soil moisture profile(0~4m) among various land uses.According to the average value of soil moisture,the lands could be ranked as: farmlandpasture landCarangana korshinskill landorchard landRosa xanthina Lindl landRobinia peseudoacacia land;the differences of soil moisture between farmland and the other 5 lands were 2.04%,2.27%,4.75%,4.8% and 5.68% respectively.The vertical distribution of soil moisture of Robinia peseudoacacia land,Carangana korshinskill land and Rosa xanthina Lindl land was accordant,i.e.,the soil moisture of the upper layer was markedly higher than that of the lower layer;the average moisture content in 0~100cm was 10.12%,13.58% and 11.89% respectively,and that below 100cm was 8.79%,12.16% and 9.07% respectively.At the same time,different land uses caused the differences of soil moisture profiles.The main differences of soil moisture existed between the surface layer and the deep layer,which showing that the types of land use and land coverage were the main reason affecting the depth of water use.