本文用主成分分析的方法构造竞争指标并建立单木生长模型。
This paper forms competition index by means of principle elements analysis and sets up individual tree growth model.
结果表明：该竞争指标对杉木人工林适用，所建立的单木生长模型符合精度要求，可用于预估林分生长。
Result shows, This competition index is suitable to Chinese fir man-made forest, and individual tree growth model accords with the demands of accuracy, it can be used to estimate growth of stands.
本文在对落叶松人工林进行立地分类和立地质量评价的基础上，建立了落叶松人工林的矩阵模型和单木生长模型。
Based on the site classification and site evaluation, the matrix models (size class model) and individual tree growth model was developed in this paper.
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