XVI International Botanical Congess
Light environment and seedling dynamics were studied in evergreen broadleaved forest of southwestern Japan. Mean light level on forest floor ranged 0.28 mol day-1 to 1.67 mol day-1. Daily PPFD fluctuated greatly with days and seasons. Although the total number of tree seedlings germinated during research period showed positive correlation to light levels, correlation between light levels and the number of germination for each species were differed with species. While the ratio of dead seedlings of pioneer species showed negative correlation to light levels. Ratio of death except pioneer species showed positive correlation to a gradient of slope. Not only light levels but also another factor, e.t., a gradient of slope, were considered to be important for seedling survival in early stages.