Research progress of soil-water dynamics model applied in SPAC system
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Key Words: soil water hydrodynamics  soil-plant-atmosphere continuum system (SPAC)  model
吴 姗1,2,莫 非2,周 宏1,2,Asfa Batool2,赵 鸿3,邓浩亮1,2,陈应龙4,熊友才2,张恒嘉1 (1.甘肃农业大学工学院 甘肃 兰州 730070 2.兰州大学生命科学学院干旱农业生态研究所/草地农业生态系统国家重点实验室 甘肃 兰州 730020 3.中国气象局兰州干旱气象研究所甘肃省气候变化与减灾重点(开放)实验室 甘肃 兰州 730020 4.西澳大学地球与环境学院/农业研究所 澳大利亚 珀斯 6009) 
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      This paper starts from the typical models of soil water dynamics as bare land evaporation model, evapotranspiration model, soil water infiltration model, and summarizes the research progress of pla nt root water uptake model, solute transport model and agricultural ecosystem model in the SPAC system. The article also analyzes and discusses the problems and shortcomings existed in current establishing model in the SPAC system by the soil water hydrodynamics model, and carries out the expectation for the developing direction and application prospect in this field. The research tendency of evapotranspiration model in future is to establish accurate numerical model to solve the practical problems. The dynamic expansion of the infiltration model from point to region, combined with the soil erosion, pollutant migration is the potential research direction. The root water absorption model should be more and more used to monitor the soil water dynamics design reasonable irrigation schedule and the droughts forecast system. It will provide strong support for the practicability and accuracy of the model by using the computer, remote sensing technology and so on to establish the mechanism model concerning matter and energy circulation in the agricultural ecological system.