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本文按照世行二期工程进行可行性确定的造林树种、材种、培育目标,遵循“适地适树”的原则,采用定量的方法建立项目区立地分类和评价系统模型。立地分类系统为6级,前三级与全国接轨,后三级是划分小班的主要依据;立地评价系统分为5大步骤控制立地类型划分的质量。根据造林树种、立地类型编拟造林类型表,“因树选地”确定项目区的规模。
According to the principle of “suitable tree fitting”, according to the feasibility of afforestation tree species, timber species and cultivation target determined in the second phase of World Bank project, this paper establishes the site classification and evaluation system model of the project area by quantitative method. Site classification system is 6, the first three levels with the country, the latter three are the main basis for the division of small classes; site evaluation system is divided into five major steps to control the quality of site type classification. According to afforestation tree species, type of site preparation afforestation type table, “due to tree selection” to determine the scale of the project area.