四川盆周山地红椿生长特性研究

A Study of the Growth Characteristics of Toona ciliate Trees in Mountainous Areas around the Sichuan Basin

本文采集了四川盆周山地广元元坝等16株红椿,通过树干解析研究其树高、胸径、材积生长规律。结果表明:红椿树高生长在前5年最快,15 a后明显减缓,树高达20 m后生长极为缓慢;胸径生长也是前5 a生长最快,胸径在达到最大值后仅呈缓慢下降;15 a、20 a、25 a树高的平均生长量以及20 a材积连年生长量均随纬度的增加而减小,随海拔增加红椿形率显著下降,出材量相应降低。因此在培育大径级用材林时,海拔不宜过高,以不超过800m为宜,并且在前5 a还要保证幼林有良好的光照条件。

In this paper,on basis of 16 trees of Toona ciliate collected around the Sichuan Basin,studies were made of the growth rules of tree height,DBH and volume through the trunk analysis.The results have shown that： the tree height growth of Toona ciliate in the first 5 years was the fastest,after 15 years became significantly slow,and after the tree heisht reathed 20 metres,its growth became extremely slow;DBH of Toona ciliate in the first 5 years grew the fastest,and after the maximum of DBH growth it declined slowly down;the average growth of tree height in 15a,20a and 25a,and successive annual increment of DBH in 20a decreased with latitude increasing,the form quotient significantly dropped with altitude increasing,and material quantity accordingly reduced.So,when cultivating the timber wood with large diameter level,the altitude should not be more than 800 m,and should have good lighting conditions for young forests in the first 5 years.