一、冻裂情况及其特点据在辽宁省台安县韭菜台、付家、新台等六个公让、15个大队、47个点的观察,加拿大杨一般是从五年生以上开始被冻裂。裂口一般是从有机械损伤及病害损伤部位或修大枝切口处裂开。其特点是: ①、群体冻裂少,孤立木、行道树冻裂多。韭菜台公社杨家塘大队于1969年在辽河左岸营造的30亩加拿大杨片林,初植密度为2×2米,现在平均树高13.2米,胸径16厘 First, the situation and characteristics of frost cracking According to the Tai’an County, Liaoning Province, leek Taiwan, pay, such as a new station six public, 15 brigades, 47 points of observation, Canada Yang is generally frozen from the beginning of five years or more. Rip is generally from a mechanical injury and disease damage site or repair the branches cut open. Its characteristics are: ①, group less fissure, isolated wood, trees and more cracks in the tree. Leek Taiwan Commune Yangjiatang brigade in 1969 in Liaohe left bank to create 30 acres of Canadian poplar forest, the initial planting density of 2 × 2 meters, the average tree height 13.2 meters now, diameter at breast 16%