用GSVAT模型研究地表/大气界面传输

Gsvat for transfer among land/atmosphere interface

用麦田水分和能量平衡资料验证了包括地下水的土壤－植被－大气水热传输模型（ＧＳＶＡＴ），结果显示，模型能较好地模拟地表／大气水热传输特征，以及土壤水分的动态变化。通过敏感性分析，探讨叶／气界面，土壤／空气界面的节水调控效应，结果发现这两个界面对水汽传输的交互影响显著，若同时增加它们的水汽传输阻力，节水效果尤其明显。

A realistic model of soil vegetation atmosphere water and energy transfer including groundwater (GSVAT)is established here. The model is validated with data obtained in winter wheat field with shallow groundwater, which is collected from recovering to maturity period lasting 71 days. The results show that GSVAT is capable of simulating energy and water exchange between land/atmosphere interface, as well as soil water dynamic movement. Through the sensitivity analysis, the impacts of resistances among the leaf/air and the soil/air interfaces on evapotranspiration is investigated. The results show that these two interfaces interact with each other, while both the resistances are enhanced, the evapotranspiration is reduced much obviously.