用动态规划方法确定华北落叶松最优轮伐期及最佳林分密度

本文采用Richards函数的修正式拟合林分胸高断面积生长方程,并考虑株数密度对断面积生长的影响;用每公顷胸高断面积和每公顷株数作为状态变量,用森林纯收益作为指标函数,建立了离散确定性动态规划模型,确定了塞罕坝林场华北落叶松人工林的最优轮伐期,并为各地位指数及不同年龄、不同初始状态的林分提供了确定最适经营密度的方法。

DETERMINATION OF OPTIMAL ROTATION AGE AND STAND DENSITY OF LARIX PRINCIPIS-RUPPRECHII MAYR. PLANTATIONS USING DYNAMIC PROGRAMMING

The paper simulated the growth of the area in tree breast height using a modified Richards function in which the influence of the stem number was considered. We established a discrete deterministic p-rogramming model which took the stem number per hectare and the area in tree breast height per hectare as two state variables,and took forest net income as the objective function. With this model, the optimal rotation age for Larix principis-rupprechii Mayr. plantations in Saihanba forestry was determined, and the optimal stand densities for different site indexes and various ages and intial states of even-aged stands were given.