应用抚育间伐资料确定经济成熟龄的初步研究

为了克服森林经济成熟龄研究中固定标准地数量少,设置年限短、资料相对贫乏和基础数据可靠性较低等缺点,本文采用来源丰富、数据可靠的间伐(或主伐)作业标准地调查表为原材料,以动态分析评价经济活动的净现值(NPV)为指标,从径级分布这个最基本的数据算起,对隆化县茅荆坝林场阴坡厚土人工油松林进行了分析,力图精确,动态地反映林地的径级分布、材种(类)出材量、价格等随年龄的变化,以确定适宜的经济成熟龄。结果表明,茅荆坝阴坡厚土人工油松林的净现值最大的年龄是27a,即为其经济成熟龄。

DETERMINATION OF ECONOMIC MATURE AGE BY USING DATA OF TENDING FELLING

In order to get rid of the shortcomings of plot shortage, limited period of design, insufficient data and low reliability of the basic data in the study of forest economic mature age, survy tables of sample plots which are of reliable and rich source were used as the original materials, and Net Present Value (NPV) as the index. In this paper, the Chinese pine plantations on North-facing slope with thick soil in Maojingba Tree Farm of Longha county were analyzed, started with the calculation of diameter class. From this, the diameter class distribution, wood output and price variation with tree age would be calculated more precisely and dynamically. As a result, the reasonable economic mature age could be determined and an easy research way found out. Our studies showed that the economic mature age (or max NPV) for the Chinese pine plantations mentioned above is 27 year-old.