4年生尾叶桉间伐效果

Thinning Effect on Growth of 4-year-old Eucalyptus urophylla Plantation

对4年生尾叶桉林分进行不同强度间伐,2a后的调查结果表明:间伐对林分平均胸径影响达显著水平;对树高生长有促进作用,但差异不显著;对单株材积生长的影响差异极显著。间伐强度越大,单株材积增长量越大。3种间伐处理的林分蓄积年增长量差异显著。根据总蓄积量和间伐后林分蓄积年生长量的变化,本试验以间伐强度60%为最佳处理。

4-year-old E.urophylla plantations were thinned by different intensity,their growth were investigated after two years.The results showed that thinning had significant effects on mean diameter at breast height（DBH） and individual volume;but thinning effect on tree height was not significant,which could promote tree height growth.The more thinning intensity,the more increment of individual volume .There were significant differences in MAI （Mean Annual Increment） of plantation among 3 thinning intensities.According to total volume and MAI,thinning intensity of 60% was the best treatment in this experiment.