用二类调查样地建立落叶松单木直径生长模型

根据来自吉林省汪清林业局二类调查的１４个落叶松固定样地的３４６株复测林木数据，建立了与我关的落叶松木平方直径生长最模型。它包含了单木直径生长模型所需考虑的林木大小，立地条件和林木竞争这３个因素，并具有与年龄、地位指数无关的特点，便于实践中应用，逐步回归的结果表明，落叶松单木平方直径生长最模型需要考虑的主要因子是林木直径值、林分断面积和坡度。

Modeling Individual Tree Growth of Larix by Using Forest Management Inventory Plots

Individual tree growth model is widely used for predicting and modeling trees growth in various stands.Individual tree quadratic diameter increment model which is distanceindependent of Larix is developed based on 346 remeasured trees growing on 14 forest management inventory plots in Wangqing Forestry Bureau of Jilin Province.This model includes three demanded elements in individual tree growth model:tree size,site condition and competition.The model is characterized by ageindependent,without requiring site index and convenient use in practice.According to the results of stepwise regression,the main factors are tree diameter,stand basal area,and slope in modeling individual tree quadratic diameter increment of Larix.