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利用全国各森林植被地理分布区森林水文要素的实验观测数据，应用多元统计回归和主分量分析等数学方法建立了描述中国森林水文要素与地理要素（经度、纬度、海拔）之间函数关系Ｆ（ｌａｔ，ｌｏｎｇ，ａｌｔ）的三维地学模型（ＤＴＭ），其中包括：全国年均降水分布规律模拟模型；全国林冠降水截留规律模拟模型；全国森林枯落物持水能力模拟模型；中国森林综合截留能力指数模型。并且利用地理信息系统的三维地学模型（ＤＴＭ）成图功能，实现全国范围内的森林水文要素地理分布规律的模拟。
Based on the experimental observation data of the forest hydrological elements in the geographical distribution areas of forest vegetation in China, mathematical functions such as multivariate statistical regression and principal component analysis were used to establish the relationship between the forest hydrological elements and geographical elements (latitude, longitude, altitude) F ( lat, long, alt), including: the national average annual precipitation distribution simulation model; the national canopy rainfall interception model; the national forest litter water retention capacity simulation model; Index model. In addition, the geography information system’s three-dimensional geography model (DTM) mapping function is used to simulate the geographical distribution of forest hydrology elements nationwide.