用模糊中心逐步修改聚类法,将陕南山区封山育林立地条件分为7种类型,依次为厚土型、缓坡型、多雨量高海拔型、多雨量低海拔型、低雨量高海拔型、低雨量低海拔型和陡坡型。这7个类型中,最优越的是第1类厚土型,依次为第2—6类,最差的是第7类陡坡型。事实证明,用这种聚类法定量分析划分封山育林立地条件类型的方法,收敛快,比较客观、科学和简便。 The fuzzy clustering method was used to modify the site of afforestation in mountainous area of ​​Southern Shaanxi. The conditions of afforestation were divided into seven types: thick soil type, gentle slope type, high rainfall type, low rainfall type, low altitude rainfall type, low elevation type Low rainfall type and steep slope type. Of the seven types, the best is the first type of thick soil type, followed by the 2-6 type, the worst is the seventh type of steep slope type. Facts have proved that using this clustering method to quantitatively analyze the conditions for afforestation afforestation site closure method, fast convergence, more objective, scientific and simple.