乌兰布和沙漠绿洲樟子松(Pinus sylvestris var.mongolica)生长规律初探

Growth Rhythm of Pinus sylvestris var.mongolicain the Ulan Buh Desert

本文以乌兰布和沙漠绿洲防护林中的樟子松(Pinus sylvestris var.mongolica)为对象,运用树干解析方法对树高、径生长和材积进行研究,结果表明:乌兰布和沙漠人工栽植的樟子松长势良好,樟子松防护林的初始成熟龄为24年;树高生长在12年(0.632m·a-1)之前为速生期,15年树高生长降为0.517m·a-1,在18年达到最大值0.634m·a-1;胸径生长速生期从第6年开始,18年达到最大值1.039cm·a-1;材积在第21年达到最大值0.108m3·a-1,达到最大值之前,樟子松材积在第12~15年和第18~21年生长速度减缓。平均木、优势木和园林木的树高差异均不显著(p>0.05);优势木与平均木、园林木的胸径生长量在F检验下差异显著(p<0.05);在第15年以前,优势木、平均木和园林木的材积生长量变化均不显著(p>0.05),第18年开始优势木与平均木材积量差异逐渐显著(p<0.05),但是樟子松平均木与园林木材积生长量差异不显著(p>0.05)。

We selected the Pinus sylvestris var.mongolica at oasis shelterbelt in the Ulan Buh Desert as research object,and determined tree height,diameter at breast height growth and volume using stem analysis.The results showed that artificial planting P.sylvestris shelterbelt grew well in the Ulan Buh Desert and its initial mature age was 24 a.The tree height fast-growing period of P.sylvestris was the first 12 a(0.632 m·a-1).Growing rate of tree height decreased in 12-15 a(0.517 m·a-1)and reached a peak value(0.634 m·a-1)in18 a.The diameter at breast height fast-growing period was in 6-18 a,and reached the peak value(1.039 cm·a-1).The volume grew slowly respectively in12-15 a,18-21 a,and reached the maximum0.108 m3·a-1in21 a.The differences of tree height among average trees,dominant trees and landscape trees was not significant(p>0.05);the difference of diameter at breast height increment among average trees,dominant trees and landscape trees was significant under Ftest(p<0.05).Volume increment difference of average trees,dominant trees and landscape trees in the first 15 a were not significant(p>0.05).The differences of average volume between average trees and dominant trees became significant gradually(p<0.05)starting from18 a,while there was no significant differences between average trees and landscape trees(p>0.05).