木荷优良家系和优良单株初步选择

Preliminary Selection of Superior Families and Superior Individuals of Schima superba

摘要:

摘要：通过对设置在福建省建瓯市东峰镇、房道镇两地5 a生5个重复130个家系的木荷优树自由授粉家系试验林的调查，研究其胸径、树高、冠幅、通直度、一级分枝、最大分枝角度、枝下高、最大分枝粗、分叉干数、分叉干高度等家系差异，并依据方差分析结果进行速生优质家系和优良单株选择。结果显示：木荷家系生长存在显著或极显著变异，其中以单株材积的家系变异最大，通直度差异不显著。以试验林总体平均胸径、平均树高、平均通直度为选择标准，初选出32个优良家系，同时，初选出平均单株材积大于0.005 9 m3、平均通直度大于3的最优家系7个，进而在最优家系内选择单株材积达到0.012 0 m3以上、主干无分叉、通直度3以上，而且冠幅基本在2 m以下、最大分支角度基本在65°以下的优良单株19株。

Abstract:

Abstracts:Two family experimental plantations of 5-year-old and 5-repeat and 130-family Schima superba were investigated on the aspects of diameter at breast height (DBH),crown breadth,straight degree,first class branch,maximum crotch angle,clear bole height,maximum branch thick,number of fork stems,and height of fork stems,in Dongfeng Town and Fangdao Town,Jian’ou,Fujian Province.The superior fast growth families and superior individuals were selected by Analysis of Variance.The results showed that there were significant difference or very significant difference among the families.32 superior families were selected based on average diameter,average height and straight degree.7 top families were selected based for the average individual volume was more than 0.005 9 cubic metres and the average straight degree was more than 3.The criteria for superior individual was that its volume of the individual was more than 0.012 0 cubic metres, and it had no fork stem,and its straight degree was more than 3,and its crown breadth was less than 2 meters,and its maximum crotch angle was less than 65 degree as the superior one and then 19 superior individuals among the 7 top families were selected.