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立地指数表是用来判定森林立地条件好坏,森林生产力大小的指标之一。目前,无论是地位级表或立地指数表,其等级的划分均依林分平均高或者优势木平均高为基础,将年龄作为自变量所求得的函数模型。这种模型对于采伐迹地、荒山荒地等宜林地的造林及更新就不适用了,这就需要使各立地因子直接做为自变量参加模型。考虑到目前的生产实践,作到简单易行,我们选择了坡度、坡向、坡位、土壤A层厚度、土壤A、B层厚度等五个因子作为自变量。由于这些因子中有数量化因子和非数量化因子,所以我们采用了数量化I的方
Site index table is used to determine the quality of forest sites, forest productivity, one of the indicators. At present, regardless of the status table or the site index table, the grades are classified according to the mean of the stands or the average height of the superior wood, and the age is taken as the function model of the independent variable. This model is not suitable for afforestation and reforestation of deforested land such as deforested land and barren hills and wastelands. This requires that each site factor directly participate in the model as an independent variable. Taking into account the current production practices, making it easy to do, we have chosen the slope, slope, slope position, soil A layer thickness, soil A, B layer thickness of five factors as independent variables. Due to the quantification and non-quantification of these factors, we used a quantitative method