Based on field measurement,the CoupModel( Coupled heat and mass transfer model for soilplant-atmosphere system) was applied to simulate water balance in three kinds of vegetation types, including broadleaved forest( Schima superba and Lithocarpus glaber),coniferous forest( Cunninghamia lanceolata and Pinus massoniana) and farmland( Zea mays) in Three Gorges Reservoir Area of China. The results showed that the simulated values of soil moisture were fairly consistent with measured ones and the determination c...