以7个立地因子的分级数据作自变量,I-214杨优势木树高作因变量,应用数量化理论I进行回归,得到7个项目至单个项目的类目得分表,用于宜林地立地质量评价和林木生长预测。结果表明,I-214杨的最佳立地条件是土壤种类二合土,地下水位1—2米,速效钾含量100ppm左右,有机质、速效磷、全氮和碱解氮的含量较高。 Using the grading data of 7 site factors as the independent variable and I-214 Yang superiority tree-height as the dependent variable, we apply the quantitative theory I to get the regression table of 7 items to the single item, Quality Evaluation and Forest Growth Prediction. The results showed that the best site conditions for I-214 were soil type of combined soil, groundwater level of 1-2 m, available potassium content of about 100 ppm and high content of organic matter, available phosphorus, total nitrogen and available nitrogen.