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运用数学中多元统计分析方法，对火炬松干枯型枯梢病针叶中所测定的全量元素进行了主分量分析，表明就树木营养状态影响枯梢病因子可分为微量及大量元素两类；并用多元回归分析对元素和发病率之间的关系，得到一个相关模型，复相关系数达0．8144。
Using the method of multivariate statistical analysis in mathematics, the principal component analysis of the total amount of elements in the needle of the dried sclerophyllous shoddy of Pinus taeda was conducted, which shows that the factors influencing the nutritional status of the blight can be divided into two kinds: trace and macronutrients; And using multiple regression analysis of the relationship between elements and incidence rate, a correlation model, the complex correlation coefficient of 0.8144.