论文部分内容阅读
作为在闽中尤溪县 6年试验研究结果的一部分 ,采用 PCA方法分析笋材两用毛竹林 (Phyllostachyspubescens)林分结构因素。结果表明 ,新成竹数量、竹林密度、年龄结构和新竹平均胸围 (GBH)是影响笋材两用毛竹林林分结构的主导因素。对各类林分进行系统聚类分析 ,笋材两用毛竹林可分为 3类 ,大致相当于竹林密度 2 5 0 0株· hm- 2 以下、2 80 0～ 40 0 0株· hm- 2 和 40 0 0株· hm- 2 以上 3种情形。用正态分布拟合新成竹胸围 (GBH )分布效果较好。新成竹胸围与竹林密度相关不显著。
As part of the 6-year pilot study in Youxi County of Minzu County, PCA method was used to analyze the structural elements of Phyllostachys pubescens stand. The results showed that the number of new bamboo, bamboo density, age structure and average bust (GBH) of bamboo are the dominant factors affecting the structure of bamboo forest. Phylogenetic tree analysis of all types of forest stands showed that bamboo plantations could be divided into three groups, which were roughly equivalent to bamboo density of 2500 plant-hm-2 and plantlets of 80-80-400 plant · hm- 2 and 40 0 0 strains · hm-2 above three cases. Normal distribution fitting new bust (GBH) distribution better. Newly-made bamboo bust and bamboo density was not significant.