闽北天然阔叶林各林层合理密度的研究

Study On Optimum Density about Various Stories of Natural Broad-leaved Forests in Northern Fujian Province

应用最大密度模型和半峰宽原理研究闽北天然阔叶林各林层的合理密度 ,结果表明 :各林层的平均胸径与最大密度、平均冠幅与平均胸径存在着显著的相关关系 ;各林层的合理密度分别为 ,第一层 0 .76 1～ 1.2 2 4N1max,第二层 0 .30 8～ 1.6 12N2max,第三层 0 .80 5 ～ 1.187N3max,并拟合出密度与蓄积量的关系 ,为合理经营天然阔叶林提供科学依据。

In this paper , the formula of peak width at half height (PWH) and the maximum density model are used to study the reasonable density about various stories of natural broad-leaved forests. The results show there are remarkable regression relationships between mean DBH and maximum density, between mean area of crown and mean DBH.The reasonable densities about various stories are showed following: The first story 0.761～1.224 N 1max; the second 0.308～1.612N 2max; the third 0.805～1.187N 3max. The relationship between density and volume was fitted.This paper provided a scientific basis for management to natural broad-leaved forests.