干扰指数在密云县侧柏水源涵养林中的应用

该文在前人工作基础上提出一种改进的邻体干扰模型 ,并利用 2 0 0 2年在北京市密云县半城子侧柏人工水源涵养林样地中基株和邻体的实际调查数据 ,讨论干扰指数与侧柏的胸径、树高、生境利用率、高径比的关系 .结果表明 ,干扰指数与林木的胸径、树高、生境利用率呈负相关关系 ,而与高径比呈正相关关系 .密度大的林分 ,干扰指数随因子变化而急剧变化 ,其中大径木的干扰指数小 ,小径木的干扰指数大 ,呈两极分化 ;而密度较小的林分 ,干扰指数减小幅度小 .该研究的结果可用来指导森林的经营活动 ,为合理经营提供依据 .

Application of interference index in water conservation forest of Platycladus orientalis in Miyun County, Beijing

This research puts forward an improved neighborhood interference model, makes use of the practical data of cardinal tree and neighbor tree in sample plots of Platycladus orientalis in Miyun County, Beijing in 2002, and discusses the relationship between interference index and DBH(the diameter at breast height), tree height, efficiency of condition utilization rate and ratio of height_diameter. The results show that the interference index is negatively correlated with DBH, tree height and efficiency of condition utilization rate but it is positively correlated with the ratio of height_diameter. The interference index acutely varied with the change of factors in the stand of high density(3 075 trees/hm\+2). The interference index of the large trees is small but that of the small trees is high; it presents a position of polarization. The interference index reduces gradually with the change of factors in the stand of low density(2 730 trees/hm\+2). The findings of the research can be applied to forest management and offer a basis for rational management.