부산대학교 도서관

The Acacia confusa Merr. is an evergreen hardwood tree that grow very quickly and can tolerate all kinds of environment. It is the best raw material of artificial coal, so it was an important reforested species for the past 30 year. When the demand for artificial coal of A. confusa was decreasing, the A. confusa artificial forest without disturbance about 30 years. This study is to set up 3 site of secondary forest in Yang-Ming Mount (GPS: E 121°32'08”N 25°08'42” E 121°32'41” N 25°08'33” E 121°32'23” N 25°07'46”), and each site sampling enough number of A. confusa and around every A. confusa to make a circle of 3×3πm^2 as a sampling unit. To collect all data of sampling units and calculate Simpson's index､ Importance value index (IVI). Finally to estimate the vegetative structure under the canopy of A. confusa in the future. The result of this study are (1) there is no seedling or sapling under the canopy of A. confusa. (2) under the shadow of A. confusa, the native species as Machilus thunbergii Schefflera octophylla, Ardisia sieboldii Psychotria rubra, Ilex asprella not Only have lots of sapling but also have grown very well, so these species will replace the intolerant tree-A. confusa in the future.