间伐对尾巨桉树冠和材性的影响及其各性状相关性

对尾巨桉（Eucalyptus urophylla×E.grandis）无性系人工林隔行间伐和不间伐（对照）处理下的植株树冠和木材物理材性进行调查和测定。结果表明：间伐后第3年，尾巨桉无性系的树冠高度、冠幅半径、FAKOPP应力波速度、生长应变和Pilodyn值与对照相比，无显著差异；冠幅半径在东、南、西、北4个方向间存在显著差异，方向间的差异性受间伐影响；2个营林处理下的冠幅均向西、南2个方向间的区域偏移；FAKOPP应力波值在4个测定方向间无显著差异；对照和间伐处理下的生长应变各测定方向间均存在显著差异，但不同测定方向间的Pilodyn值无显著差异；各测定性状间无显著相关关系。由此说明，隔行间伐措施可调节树冠空间分布，但不影响林分树冠大小和主要木材物理材性。

Crown and Wood Properties Responses to Thinning and Their Correlations in Eucalyptus urophylla x E. grandis

Crown and wood properties of trees under thinning and unthinned （ investigated and measured in an Eucalyptus urophylla x E. grandis plantation. after 3-years thinning, the thinning and control treatments had little differences radius, FAKOPP velocity, growth strain and Pilodyn. Mean crown radius had control） treatments were The results showed that in crown height, crown significant difference a mong four directions （including east, south, west and north）, and the differences were affected by the thinning. The crown was asymmetric to the quadrant of south-west. FAKOPP velocity and pilodyn showed no differences among measuring directions while growth strain had significant difference between measur ing directions. No significant correlations were found between tested traits. It was illustrated that inter laced thinning might not affect crown size and major wood properties but could adjust the crown structure