赤松次生林天然更新主成分分析与因子分析

在青岛崂山赤松次生林区，运用常规森林更新调查方法获得了５７块标准地资料，用电子计算机进行主成分分析和因子分析，结果表明，主成分分析和因子分析完全吻合。影响赤松次生林天然更新的诸多因素可以归并为林分条件、土壤条件和地形条件，它们在森林更新中的作用为林分条件＞土壤条件＞地形条件。文中还讨论了各观测变量之间的相互关系

PRINCIPAL COMPONENTS ANALYSIS AND FACTOR ANALYSIS ON NATURAL REGENRATION OF SECONDARY FOREST OF JAPANESE RED PINE

Data of secondary forest of Japnese red pine (Pinus densiflora) from 57 plots were obtained by normal investigation method of forest regeneration in Lao Shan Mountain,Qing Dao.The program calculation of principal components analysis and factor analysis had been done by electronic computer.The results show that the outcome of principal components analysis is consistent with factor analysis.Many factors affecting natural regeneration of secondary forest of Japanese red pine can be induced form forest stand condition ,condition of forest soil and topography condition.Effects of the conditions on natural regeneration of secondary forest of Japanese red pine are different of forest soil is second and that of topography codition third.The relationship of forest variables observed is discussed also in the paper.