修剪对木荷生长的影响及通径分析

Effect of Pruning on Growth of Schima superba and its Path Analysis

为探索除叉干和修枝对木荷生长的影响,选择5年生木荷幼林为研究对象,以T 1(不除干+不修枝)为对照,采取T 2(修枝+除干)、T 3(不修枝+除干)的2种树体管理措施,对各项生长指标进行测定分析,结果表明:3组处理间所有指标均存在显著或极显著差异,其中,对木荷材积最直接影响的为平均分叉干数(1.8261)和冠幅(1.0796)。修枝、除干处理可以显著减少木荷的平均分叉干数、分叉率,T 1(CK)的平均分叉干数、分叉率分别是T 2和T 3的14.55倍、17.00倍和2.06倍、2.34倍;T 2和T 3的胸径、树高和材积分别比T 1(CK)高50.06%、29.46%、170.28%和24.68%、19.17%、77.28%。通过对木荷修枝+除干处理,可有效改善木荷分叉情况;在木荷造林1~2年时,加强除干和修枝有助于优质干材的培育。

The bifurcation trait of Schima superba is the main factor affecting the growth of wood and improving the quality,to investigate the effects of lopping and pruning on the growth of S.superba.The five-year-old S.superba was selected as the material for the pruning of the annual young S.superba forest.Take T1(no trunk pruning+no pruning)as a control and take two tree management measures T2(pruning+trunk pruning)and T3(no pruning+trunk pruning).Each growth index was determined and analyzed.Result show that after treatments significant or very significant differences were found in all the indexes among these three treatment groups.Treatment(pruning and trunk pruning)can significantly reduce the average branch number and branching ratio of S.superba.The average branch number and branching ratio in T1(CK)is respectively 14.55 and 17.00 times,and 2.06 and 2.34 times of T2 and T3.However,the DBH,tree height and volume of timber in T2 and T3 is respectively 50.06%,29.46%and 170.28%,and 24.68%,19.17 and 77.28%higher than T1(CK).Pruning and trunk pruning can efficiently improve the divarication of S.superba.Trunk pruning and pruning treatments in the 1-2 years of afforestation stage of S.superba will help the cultivation of high-quality dry wood.