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随着造林绿化事业的发展,防护林的蓄积量和四旁树的总材积逐年增多,对这些林木和树木的测定方法应进一步探讨。本文仅就防护林、四旁树的蓄积量测定,提供几点测定方法,仅供生产单位参考。防护林大都是带状或是单行的,四旁树有单行的、块状的,也有零星分布的。根据防护林和四旁树的特点,我们选用下列三种测定方法: (1)株数法: 就是在防护林和四旁树中,查数株数,然后求出它们平均直径和平均高,根据所查株数多少,确定伐倒若干株平均木,求出平均材积,乘以所查株数,即得防护
With the development of afforestation, the volume of shelterbelts and the total volume of four-sided trees have been increasing year by year, and the determination methods of these trees and trees should be further explored. This article only on shelterbelt, four-storey tree volume determination, provide several measurement methods, for reference only for the production unit. Shelterbelts are mostly strip or single, surrounded by trees have a single, massive, but also sporadic distribution. According to the characteristics of the shelterbelts and the four sides of the tree, we choose the following three methods: (1) Number of trees: in the shelterbelts and the four sides of trees, check the number of trees, and then find their average diameter and average height, Determine the number of trees cut average number of trees, find the average volume, multiplied by the number of plants examined, that was protection