Soil
moisture regimen changes with different localities of topography in Maowuse transition zone from sandy land to desert.Soil
moisture distribution in sandy land(soil moisture models)and the characteristics of soil water used by sand plants(sand plant distribution models) depend on the conditions such as dune drift on slope facing the wind,dune sand on slope out of the wind and groundwater table within lowlands among dunes.The mechanism of soil water used for sand plants could be demonstrated by the following two aspects:the physiological and ecological processes and biomass of ground parts of sand plants,distribution of root system of sand plants and soil water environmental capacity.In the development of mobile dunes changing into fixation ones,the relationships between soil moisture dynamics after the formation of shrub
communities on stabilizing mobile sand and actual evapotranspiration of shrub communities would show the regimens of soil water balance of different vegetative cover,different densities of shrub communities,different years and seasons.Cobinated with which,the application of soil moisture models could be helpful to establish and keep a sustainable and better successed community.In order to improve water utilization rate of sand plants,the following 3 aspects should be taken (1)Selecting the
drought resistant species by the analysis of the characteristics of physiology,ecology and heredity of sand plants.Native species will be available for rehabilitation of individuals or communities,however,it is important to pay more attention to importing species;(2)New materials of anti-drought and soil water conserved should be used for the establishment of shrub communities of stabilizing mobile sand,especially for recover and growth of root system during the period of spring drought,such as gel-forming cross-linked polyacrylamide,water save surfactant,ctomycorrhizal fungus and other soil microbe preparations and (3) Densities of shrub communities of stabilizing mobile sand and disposition of different communities in responses to phrases of dune development should be in accordance with soil water environmental capacity. \ \