1.College of Resources and Environment,Northwest A & F University;2.State Key Laboratory of Soil Erosion and Dryland Farming of Loess Plateau,Institute of Soil and Water Conservation,CAS & MWR: 712100,Yangling,Shaanxi;3.Shanxi Institute of Soil and Water Conservation Science,033001,Lishi,Shanxi: China
Abstract：It is very important for soil-vegetation-atmosphere transfer models(SVAT model) to study the interaction and relationship among precipitation,vegetation water storage,surface water,soil water,and ground water,the process of vegetation water consumption and the regulation of ecological water demand,the feedback mechanism between ecosystem and local climate,the mechanism of reciprocity between vegetation and soil water,and the restoration and rehabilitation of ecological environment.SVAT models have been improved from single canopy models to double canopies or multiple canopies models through 3 stages development of bucket model,biophysics model and biochemistry model for about 50 years.The experts abroad and home have made many kinds of SVAT models based on a great deal of experiments and this models were verified,evaluated and modified in many regions all over the world.This paper summarized the parameterization schemes for main water and heat process,application,researches,comparison,and improvement in parameterization schemes of SVAT models,and put forward some problems to improve and perfect existing SVAT models,mainly including the offsetting of Underlying Surface,the simplification,validation,and comparison about SVAT models.
2008, Vol. 6 
