贵州喀斯特地区侧柏人工林天然更新效果的因子分析法研究

Factor Analysis on Natural Regeneration of Platycladus orientalis Artificial Forest in Karst Area of Guizhou Province

以2005年设于贵州喀斯特地区普定县的12块侧柏人工林样地的调查资料为基础,利用统计软件SPSS中的因子分析方法,分析了喀斯特地区侧柏人工林分的8个因子对其林分天然更新幼树株数的影响。结果表明:每公顷天然更新的侧柏幼树株数与其林分的郁闭度、林木株数以及林地的坡向具有显著的相关性。可将影响侧柏人工林天然更新效果的8个因素归并为林分结构、土壤条件和地形条件,它们在其更新中作用的大小顺序为林分结构>土壤条件>地形条件。

Based on the investigation data of 12 sampling plots of Platycladus orientalis artificial forests in karst area of Guizhou province, using the factor analysis method of SPSS statistical software, the influence of eight factors in Platycladus orientalis artificial forest on the number of saplings in natural regeneration was studied. The results showed that the number of Platycladus orientalis new saplings in unit area was positively related with crown density, number of trees and slope aspect. Eight factors affecting the natural regeneration of Platycladus orientalis forest could be summarized as stand structure, soil condition and topographic condition, their role in regeneration was stand structure 〉 soil condition 〉 topographic condition.