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本文根据我国天然次生林的实际情况,以山西省五台山林区宽滩林场的用材林为例,组织了包括三种不同类型森林的过渡性混合作业级,运用线性规划的方法和确定调整期的移动图解法对该作业级制定调整方案。以不同采伐年龄和调整期为主要约束条件,并结合其他条件,建立数学模型,用单纯形法对模型求解,得到合理的永续收获方案,使该作业级达到具有同一目的树种、同一采伐年龄的正常作业级,实现永续经营。文中提出的移动图解法,使调整期的确定方法,得到了较大的改进。
Based on the actual situation of natural secondary forest in our country and taking the timber forest of Broadbeach Forest Farm in Wutai Mountain of Shanxi Province as an example, this paper organized a transitional mixed operation level including three different types of forests, using linear programming method and moving plot to determine the adjustment period Law to adjust the level of the program. Taking different cutting ages and adjusting periods as the main constraints and combining with other conditions, a mathematical model is established and the model is solved by the simplex method to obtain a reasonable permanent harvesting plan, so that the operating level reaches the same purpose tree species, the same cutting age The normal operating level, to achieve sustainable development. The moving graphic method proposed in this paper has greatly improved the method of determining the adjustment period.