为优化南方红豆杉幼林修枝技术,以福建省13年生南方红豆杉为研究对象,分析修枝木的树高、胸径与修枝强度对修枝2年后的林木生长与干形形质的影响。采用主成分聚类分析方法,依据参试的31株南方红豆杉单木修枝后的生长及形质性状的综合得分值进行系统聚类,确定最优的修枝木类群,估算最优类群总体参数,实现目标树修枝精确且优化。结果表明:修枝对单株材积和形数的影响随着修枝时间推移而变大; 2年后修枝木的树高、胸径与修枝强度对修枝后的生长与干形形质有着显著影响,进行目标树选择与修枝强度优化十分必要。在99%置信区间内,南方红豆杉目标树合理的修枝强度(相对高)为0.272 9～0.319 1,目标树要求树高501.55～527.45 cm,胸径11.93～13.56 cm。
Abstract
In order to optimize pruning techniques of Taxus chinensis var. mairei. The 13-year-old plantation in Fujian Province was taken as test objects for conducting the pruning tests. The influence of the pruning wood tree height, DBH and pruning intensity on the growth and stem forming characteristics of the trees after two years were analyzed. The results showed that the role of pruning on the single volume and breast height form factor indexes of the tested trees increased with the time extending. The pruning wood tree height, DBH and pruning intensity exert significant effect on the growth and stem forming characteristics of the trees after pruning for two years,it is necessary to select target trees and optimize the pruning intensity. The 31 T. chinensis var. mairei pruning individual trees were cluster analyzed according to the comprehensive score of growth and form traits of two years after pruning by principal component cluster analysis method. The results could determine the optimal pruning individual trees group, estimate the optimal group general parameter,and accurate optimum target trees pruning techniques. The reasonable target trees pruning intensity of T. chinensis var. mairei were 0.272 9-0.319 1 for relatively high,the target tree requirements were 501.55-527.45 cm for tree height,and 11.93-13.56 cm for DBH with a 99% confidence interval, which provided theoretical basis for the cultivation of T. chinensis var. mairei.
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基金
收稿日期:2015-05-27 修回日期:2015-09-27
基金项目:三明市林业重大科研项目(2015-41)
第一作者:欧建德(smmxojd@163.com),教授级高级工程师。
引文格式:欧建德. 基于多元统计分析的南方红豆杉幼林修枝技术[J]. 南京林业大学学报(自然科学版),2016,40(3):183-187.
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