人工林经营过程密度最优控制研究

在连续状态动态规划方法建立的人工林种群密度决策模型的基础上，首次提出应用遗传算法优化人工林林分经营过程的间伐时间和主伐时间的最优组合方案，并阐明其数学模型和具体方法。杉木人工林经营过程的密度最优控制方案优化实例表明，用遗传算法优化能收到良好效果。优化结果表明，杉木人工林经营过程中以间伐两次为最优，第一次在１１～１２年，第二次在１５～１８年，而主伐年龄以２５年为最优。

A STUDY ON DENSITY OPTIMUM CONTROL DURING STAND MANAGEMENT FOR PLANTATION

Based on density decision model of plantation established by continuous stages dynamic programming, Genetic Algorithm is presented to select optimal decision in determining thinning age, and cutting age during stand management.The mathematical models and concrete method are offered and discussed.The density optimal projection of Chinese fir plantation during its management shows that Genetic Algorithm can get satisfactory results.The optimized results indicate that the optimal frequency of thinning is 2 for Chinese fir plantation during its management. The first time for thinning can be 11～12 years, while the second time for thinning can be 15～18 years. The optimal time for final cutting is 25 years.