Analysis on 0～50cm soil moisture content and precipitation and evaporation relationship

The material of 0～50 cm soil layer soil moisture content and the same time precipitation,the transpiration rate of the Suixi County was analyzed.The results indicated that,soil moisture main active layer was topsoil,between the different level soil moisture content had the extremely remarkable correlation.The soil moisture content fluctuation and the period precipitation,the transpiration rate assumed the straight line correlation relations.The topsoil soil moisture content change and the current period and the base period ratio and the moist coefficient assumes extremely obviously was being connected.Needs the precipitation or the supplement irrigates 13.6～39.0 mm only then to enable the topsoil relative water content to achieve 80%.When the moist coefficient was 0.47,The topsoil soil moisture content should maintain at the base period level.The topsoil soil moisture content steams reduced assumes quickly-slow-slow the change process,Steams the rate of deceleration along with the soil moisture content change available exponential curve fitting.While the topsoil relative water content to achieve 80% above a precipitation,continuously 10.7～38.3 d non-precipitation topsoil relative water content still permissible maintenance above 60%.