1.前言干形是林木重要工艺特性之一,它在很大程度上决定着树木的价值与木材利用程度。在经济上树干弯曲的不利特性经常包含有其他方面的价值降低。树冠较窄,起源于东部和北部的松树,一般不仅比西部起源的宽树冠松树枝节度较小,而且与之相反,它还以引人注目的树干端直著称。Orlowsky,Shgmiat Schutt及Petrinii对此均特别注意 1. Introduction Dryness is one of the important characteristics of trees, which largely determines the value of trees and the degree of timber utilization. The unfavorable nature of economic tree bending often involves other aspects of value reduction. The narrower canopy, which originates in the eastern and northern pines, is generally not only less concussed than the broad-leaved crown of pine in the west, but on the contrary it is notable for its striking trunks. Orlowsky, Shgmiat Schutt and Petrinii all pay special attention to this