Abstract
he management purpose of plantation is to produce woods with high economical values. Selecting suitable planting species and operational strategy are necessary. The materials of this study are Taiwania cryptomerioides and Cunninghamia konishii plantations, serious destroyed by typhoon and distributed in Liouguei Research Center, Taiwan Forestry Research Institute. We set up 7 transect lines; each is composed of 30-50 meters long. All woody plants in the area 1 meter astride transect lines, species with dbh ≥ 1cm present in the quadrates were identified and their dbh were measured. Light environment under the forest canopy above each transect line were estimated by 100 hemispherical images to measure the average light transitivity of each microhabitats. We planted Zelkova serrata, Michelia compressa and Machilus thunbergii seedlings, high economical value and primitive tree species, in three different microhabitats: (1) closing canopy with nature regeneration trees in the substratum with relative luminosity under 20% (2) spare canopy trees with nature regeneration trees in the substratum with relative luminosity between 40% and 60%(3) spare canopy trees without nature regeneration trees in the substratum with relative luminosity above 70%. The objective of this study is to explore the survival rate and growth status of seedlings of three different tree species under different relative luminosity. The results are expected to apply to operational technique of plantations.