不同竹龄毛竹基本密度的株内及株间变异

Density Variation of Different Ages' Moso Bamboos Within A Bamboo and Among Bamboos

为揭示毛竹株内、株间基本密度变异规律,测定了不同竹龄、不同高度、不同径向部位毛竹的基本密度,并进行了方差检验和多重比较q检验;对测定的结果回归分析,得出基本密度—竹龄关系的回归方程。结果表明:毛竹基本密度株内径向变化规律为竹青基本密度最大、竹黄基本密度次之、竹肉基本密度最小;株内纵向变化规律,基本密度自下而上逐渐增大。同龄毛竹株间基本密度的变异相对较小,仅有1年生、4年生、5年生的竹黄基本密度差异极显著,1年生竹肉的基本密度差异极显著,6年生竹青的基本密度差异极显著。不同竹龄毛竹基本密度的变化规律为1年生的基本密度最低、2年生的基本密度迅速增长、3年生的基本密度略有降低,之后小幅波动并呈上升趋势;至7年生为止,总体上基本密度呈逐年增长的趋势。

The experiment was conducted to study the basic densities with different ages, different height and different radial po-sitionsto reveal the variation regularities ofP hyllotachys pubescens within a bamboo and among bamboos and investigate the variance test and multiple comparison q test.By regression analysis, the regression equations of the relationship were ob-tained between densities and ages.The radial variation of outer moso bamboo density is maximum, and the inner is mini-mum.The longitudinal variation of density increases gradually from bottom to top.The variation of basic densities at the same age was relatively small except the inner bamboo at one, four and five years, the middle bamboo at one year and the outer bamboo at six years.Variation rule of different age moso bamboo density is that：the basic density of one year is min-imum, that of two years is in rapid growth, that of three years reduces slightly, there is a slight fluctuation with the rising trend, and until the seventh year there is a increasing trend generally.