论文部分内容阅读
会宁县自一九七二年从河南省大量引种大官杨后,由于其生长迅速,繁殖容易,很快就在全县普及,目前大部分处在幼龄和中龄阶段,逐渐进入利用时期。由于当地无适当的测树数表(材积表),对其干形特点及变化规律又了解甚少,从而给大官杨的立木蓄积量的测算和资源数据统计工作带来了困难。本文拟对这个问题,通过对其干形变化规律的分析,做一些
Huining County since 1972, introduced a large number of large poplar from Henan province, due to its rapid growth, breeding easy, and soon spread throughout the county, most of the time in the young and middle-aged stage, and gradually entered the use of period . Because there is no proper tree-counting table (Volume Table) in the area, little knowledge is gained about its dry-shape characteristics and its variation pattern, which makes it difficult for the estimation and calculation of standing tree stock volume and resource data of Daguanyuan. This article intends to do some research on this issue through the analysis of the law of its dryness