【摘要】 应用TWINSPAN和DCA对东山试验林场油松人工林的40个样地进行数量分类与排序。TWINSPAN将40个样地划分成10个群丛。10个群丛组从左到右的顺序揭示了油松人工林的演替进程及林下草本层的变化规律。DCA样方排序的第1轴反映了油松人工林生境中坡向的变化;第2轴反映了油松人工林的土壤和水分梯度变化。TWINSPAN分类和DCA排序都是间接梯度分析,这两种方法结合很好地揭示了人工林演替进程中林内生境异质性及下层植被盖度的变化规律。更多还原

【Abstract】 Using TWINSPAN and DCA,40 Pinus tabulaeformis plantation quadrats collected from experimental forest farm in the East Mountain and were studied. All the quadrats were classified into 10 association groups,and the order of these groups in the classification dendrogram reveals the succession progress of Pinus tabulae formis plantation and the variety law of herd layer.The first axis of DCA ordinationre flects aspect variety among the habitats in Pinus tabulaeformis plantation,and the second axis reflects the gradient in soil and water. Through indirect gradient,both TWINSPAN and DCA indicate that habitat heterogeneity and the under layer vegetation changes with the Pinus tabulaeformis plantation succession progressing.更多还原