密度对毛竹生长的影响

本文以崇阳县毛竹为研究对象,在4种密度(1 300±100株·hm~(-2)(D1)、1 900±100株·hm~(-2)(D2)、2 500±100株·hm~(-2)(D3)及3 100±100株·hm~(-2)(D4))毛竹林分内对其主要生长因子进行了实地调查以研究毛竹林分密度效应。结果表明,虽然密度对退笋率影响不显著,但对毛竹的出笋率和成竹率有显著影响,二者都呈现出先增大后减小的趋势。毛竹林叶面积指数随林分密度的增大而增大(3.18~7.10),不同密度毛竹叶面积指数之间的差异极显著。毛竹林分平均胸径在10.75~11.75 cm,不同密度毛竹胸径之间的差异极显著。毛竹林分平均竹高在12.96~13.33 m,不同密度毛竹竹高之间的差异不显著。株数按径级分布与株数按树高级分布均符合正态分布。

Effect of Density on Growth of Phyllostachys pubescens in Chongyang

Phyllostachys edulis (Moso bamboo)in Chongyang had been taken as research object.With 4 density stands, i.e,1 300±100 stems??hm-2 (D1),1 900±100 stems??hm-2 (D2),2 500±100 stems??hm-2 (D3)and 3 100±100 stems??hm-2 (D4),a study on stand density effect had been carried out,the results showed that although forest density had no effect on the shoot degenerated rate,it had a significant effect on bamboo shoot rate and stem rate,both presenting a trend of increasing at first and then decreasing.There was a significant difference for leaf area index among different density of stands,which increased with the increase of stand density with a range of 3 .1 8~7 .1 .The diameter at breast height was 10.75~11.75 cm,and the difference was extremely significant,and the average height was 12.96~13.33 m, and the difference was not significant.Both diameter distribution and height distribution of 4 density of P.edulis stands were normal distribution.