| 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) ", selected the study area in Horqin sandy, based on the theory of GSPAC (Groundwater-Soil-Plant-Atmosphere Continuum) system, consider the groundwater - soil - plant–atmosphere as a unified continuum . Study the moisture transforming relationship for GSPAC system of different landscape types (dune and meadow to dune) based on two years field test, at the same time follow the idea of continuous, systematic, dynamic perspective.Main achievements of this study are:(1) Study the conversion and migration between precipitation and soil water and groundwater in dune-meadow-dune area.(2) Make the study for water surface evaporation intensity simulation of small lake in study area. Construction the model of small lake in dune-meadow-dune area.(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, simulation of soil evaporation on the different landscape patterns or different vegetation types.(4) Analysis formation and transformation law of CW through the test of condensation water observation in dune and meadow to dune area in Horqin sand, and study the responsing relations among CW and the variation of air temperatureΔTD-L,relative humidity of the airΔRHa in months, then proposed the CwL-DWD model that calculation the soil condensate water that supply the groundwater .Innovation points in this study are:(1) Make the study of water migration for soil profile based on different rainfall on the different landscape patterns or different vegetation types in dune-meadow-dune area in Horqin sand, and make the comparison for water migration law and soil water suction between different landforms ;(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 EL-DMD of water surface evaporation intensity simulation of small lake, the model full considerat the efecct of enviroment around the lake , make the variation of air temperatureΔTD-L and relative humidity of the airΔRHa as the factors to the model, the model better reflects the effect for the shape of dune-meadow-dune to water surface evaporation of small lakes.(4) From the formation mechanism of soil condensation water, make two parts for the recharge of soil condensation water. Using the model to simulation the recharge of soil condensation water WC Win study area, through the comparative analysis between the measured value and the caculate value, reliability of the model, verify the reliability of the model.
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