落叶松林木枯损模型

摘要/Abstract

摘要：

林木枯损模型是林木生长模型系统的重要组成部分。根据来自吉林省汪清林业局森林经理调查的12个落叶松复位样地的131个径阶组数据,应用Logistic型回归式建立了落叶松林木枯损模型。自变量有径阶、相对直径、每公顷株数、每公顷断面积、平方平均直径、郁闭度和大于所估径阶的林木直径平方和。考虑模型的相关指数和各参数的变动系数,得出仅包含相对直径、郁闭度、平方平均直径3个自变量的经验方程。该经验方程具有形式简单、测算容易、无需年龄和地位质量指标、参数稳定性好等特点,可用于落叶松径阶枯损比率和单木枯损概率的预估。

关键词: 落叶松, 枯损模型, 森林经理调查

Abstract:

Tree mortality model is an important part of tree growth model system. Logistic regression was used to model tree mortality of Larix based on the data from l31 diameter-class groups of l2 forest management inventory remeasured plots in Wangqing Forestry Bureau of Jilin Province. Independent variables are diameter class, relative diameter (RD), number of stems per hectare, basal area per hectare, quadratic mean diameter (DG), degree of closeness (P) and sum of squared diameter of larger trees than the predicting diameter class. An empirical equation including RD, P and DG was proposed by means of square correlation coefficient and coefficient of variation for all parameters. The equation is characterized by simple form, convenient measurement and calculation, without requiring stand age and site quality index, and good stability of the parameters. It may be used to predict mortality ratio of diameter class and mortality probability of individual tree for Larix.

Key words: Larix, Tree mortality model, Forest management inventory

杜纪山. 落叶松林木枯损模型[J]. 林业科学, 1999, 35(2): 45-49.

Jishan Du. TREE MORTALITY MODEL OF LARIX[J]. Scientia Silvae Sinicae, 1999, 35(2): 45-49.

图/表 3

参考文献 19

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