基于冠高比法修枝对杨树生长效应的综合评价

Comprehensive Evaluation of Pruning Effect on Populus Growth Based on Crown Height Ratio Method

【目的】通过对杨树科学合理修枝,生产无节良材,提高出材率,削弱树木和林下作物对光的竞争,增加林下作物产量。【方法】采用冠高比法修枝,即保留树冠的高度占树木高度的比值来区分修枝强度等级,分为弱度修枝(P1)、中度修枝(P2)、重度修枝(P3)三种修枝强度,以不修枝(CK)为对照,测定树高、胸径的生长量,进行数据差异显著性检验。【结果】中度修枝处理中胸径、树高、材积增长量均高于弱度修枝、重度修枝和对照。【结论】中度修枝(P2)为最优修枝处理。

【Objective】Scientific and reasonable pruning of populus can produce good timber without knots and improve the yield.It can increase the yield of understory crops,weaken the competi-tion of trees and understory crops for light,and improve the yield and quality of wood.【Method】The pruning intensity was divided into three levels:weak pruning(P1),moderate pruning(P2)and severe pruning(P3),compared with CK.After repair,the height and DBH growth of the test trees were mea-sured,and the statistical analysis software was used to test the significance of data difference,and Mi-crosoft Excel 2003 was used to draw the chart.【Result】The results showed that the growth of DBH,tree height and volume in moderate pruning treatment were higher than those in weak pruning,severe pruning and the control.【Conclusion】From the growth effect of the test trees after pruning,moderate pruning(P2)which means that the crown height is 1/2 of the tree height,is the best pruning treatment.