Test And Simulation Analysis For Soil Evaporation Dynamics In Dune-Meadow-Dune Area In Horqin Sand

This paper relies on the National Natural Science Foundation project " Simulation for the course of atmospheric, hydrological, ecological coupling in the areas of lowland alternate with dune in Horqin sand (50669002) " and " Field tests and simulation analysis of the soil, heat and salt transportion during freezing and thawing in Horqin sand (50769003) ", selected the study area in Horqinsandy, based on the theory of GSPAC (Groundwater -Soil-Plant-Atmosphere Continuum) system, consider the groundwater - soil - plant–atmosphere as a unified continuum . Study the soil moisture evaporatio for GSPAC system of different landscape types (dune and meadow to dune) based on one year field test, at the same time follow the idea of continuous, systematic, dynamic perspective.Main achievements of this study are:(1) Study the seasonal disciplinarian of soil evaporation in dune-meadow-dune area.(2) Field experimental study on the measurement of soilevaporation using different types of micro-lysimeters, to find a most appropriate micro-lysimeters which could measure soil evaporation in dune-meadow-dune area well and truly.(3) Study the relationship betwee the soil water and the precipitation, analysis the characteristics for soil evaporation in dune-meadow-dune area, make the study of meteorological factors research for sandy soil evaporation capacity using principal component analysis.(4) Study the relationship and influence betwee the soil evaporation and soil moisture.(5)base on the Study the relationship and influence betwee the soil evaporation and soil moisture and meteorological factors, proposed the E S? DMD model and simulation of soil evaporation on the different landscape patterns.Innovation points in this study are:(1) Make the study of soil evaporation based on the different landscape patterns types in dune-meadow-dune area in Horqin sand, and analysis and compare different types of micro-lysimeters measuring soil evaporation to find a most appropriate micro-lysimeters;(2) Make the method of principal component analysis to the study of meteorological factors research for sandy soil evaporation capacity , give three main factors to impact sandy soil evaporation capacity; (3) Proposed a model E S? DMD of soil evaporation, the model full considerat the efecct of enviroment and soil moisture around the areo, make the variation of soil temperature ,wind speed, water surface evaporation and radialization as the factors to the model, the model better reflects the effect for the shape of dune-meadow-dune to soil evaporation .