商品材积变型估测系统的研究

A STUDY ON THE VARIABLE MERCHANTABLE VOLUME ESTIMATION SYSTEM

为了统一立木和伐倒木的求积方法,克服立木材积表与材种出材量表互不衔接的问题,本项研究选用浙江省实生杉木为试验材料,研究了描述立木干形的数学方法;提出变型形数的概念;导出了新的变型削度模型。通过削度模型的比较,采用最优变型削度模型编制了二元变形商品材积表。若将单木的胸径和树高的实测值直接输入微机,可以同时获得精确的全材积和各商品材的材积值。这可为科学经营森林、合理开发利用、落实限额采伐措施等提供森林资源的数量和质量指标的依据。

In order to integrate the stumpage volume caculating method with that of the felled tree and overcome the unjointment of the stumpage volume table and merchantable volume table, the materials of the seedling Chinese fir in ZheJinag Province was selected in this essay. The mathematical methods to describe the stem profiles was studied, the new concept of the variable form factor was advocated and the new variable taper models derivated. After the comparing of different taper models, the optimum variable taper models was selected to construct a Two-way variable merchantable volume table. If the data of D. b. h. and H for a single tree was inputed into computer, the precise total volume and different merchantable volume could be obtained consistently. This provide the index basis about forest resource' s quantity and quality for the purpose of scientific forest management reasonably exploitation and utilization and realizing of limited cutting plan.