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择伐作业中的首要问题是确定采伐量。伐区式作业采伐量的确定方法对择伐作业是不适用的。择伐作业每年要在很大的面积上(占整个作业级的1/8-1/10的面积)同时采伐一部分蓄积量。所以采伐量应根据作业级的总蓄积量和采伐总蓄积量的百分数来确定。为了确定择伐作业的采伐量,我们提出自己的方法。利用法正林的某些原理做为此方法的理论基础。根据法正林的理论,法正蓄积量是按下列公式来确定
The first issue in selective operations is determining the amount of harvest. Deforestation-type operations to determine the amount of cutting methods for logging operations is not applicable. Selective cutting operations meanwhile harvesting a portion of the stock volume on a large area (1 / 8-1 / 10 of the entire job grade). Therefore, the amount of harvesting should be based on the total volume of operations and the total volume of harvesting to determine the percentage. In order to determine the amount of cutting operations for selective operations, we propose our own method. Use some of the principles of law forest as the theoretical basis of this method. According to Fa-Lin’s theory, the law is the accumulation of volume is determined by the following formula