Abstract
We examined the spatial distribution of saplings in relation to topography and stand structure in a subtropical evergreen broad-leaved forest in the northern part of Okinawa Island, Japan. The distributions of most species were influenced mainly by topography but also by canopy openness. Species were arranged along a topographical gradient from concave areas with low canopy openness to convex areas with high canopy openness. Canopy species were arranged along a gradient from unstable fertile areas to stable infertile areas. Species occurring mostly in convex areas had a narrower distribution range than those in concave sites. Thus, habitat heterogeneity provided by topography and stand structure appears to be important factors for maintaining high species diversity in the understory of this subtropical evergreen broad-leaved forest.
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