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辽宁东部山区是我国用材林基地之一,该区气候湿润,土壤肥沃,适于核桃楸生长。为了在经营管理上做到“适地适树”,我们做了核桃楸林立地类型数量分类的研究。首先,选定与立类型密切相关的立地因子,建立多变量数学模型,计算其线性组合函数值,即主分量。用第一主分量与第二主分量作两维排序,再分别进行两维聚类,划出核桃楸立地类型。 为使用方便起见,以信息量最多的第一主分量,编制核桃楸立地类型上层林分高表,应用于林业生产实际。
The eastern mountainous area of Liaoning is one of the timber forest bases in China. The climate in the area is humid and the soil is fertile. It is suitable for the growth of Juglans. In order to achieve the management of “suitable tree”, we have done a study on the quantitative classification of walnut trees. First, we select the site factors that are closely related to the vertical type, establish the multivariable mathematical model and calculate the linear combination function value, that is, the principal component. Using the first principal component and the second principal component for two-dimensional sorting, and then two-dimensional clustering respectively, draw out the site type of walnut. For ease of use, with the largest amount of information of the first principal component, the establishment of Juglans mandshurica stand type upper stand high table, used in forestry production.