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18,717,000 Yen (FY1995 5,312,000 Yen)
Population structures of major tree species and distribution of palm, bamboo, and canopy gap were studied in a hill dipterocarp forest at Semangkok Forest Reserve, Peninsula Malaysia. The characteristic of this study is to obtain the whole demographic data from seeds, seedlings, saplings to mature trees.All trees larger than 15cm in gbh were tagged and their gbh were measured on March, 1993 and on April, 1995. Seed production, seedling establishment were examined in the 2 ha core area. One hundred seed traps were set up adjacent to the corner post at every 20m point and the center of the 20m x 20m quadrat. We censused new seedlings at 100 of the 1m x 1m quadrats adjacent to the seed traps. Saplings were tagged and measured at 600 sub-quadrats(1 x 4m) in the 6 ha plot every 10 m. Distributions of canopy gaps, palm and bamboo were censused every 5m x 5m quadrat in the whole 6 ha plot. We analyzed the spatial structure and size structure of 30 abundant species by cluster analysis. These 30 species were divided into a ridge-group and a slope-group. We recognized four size groups, emergent, canopy, understory and others. The distribution of Shorea curtisii is restricted to ridge and upper slope which is completely overlapped with that of the palm. This palm occurred 40% of 5m x 5m quadrats in the 6 ha plot. The relationship between the regeneration success of S. curtisii and the shading effect by the palm must be studied in the future. Distribution pattern of bamboo was restricted to lower slope. This bamboo prevents regeneration of tree species. Its growing area was 1.8% of the 6 ha plot. Percentages of canopy gaps were 15.6%.
Hill Dipterocarp Forest, Major Tree Species, Population Structure, Peninsula Malaysia