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47,284,000 Yen (FY1995 15,892,000 Yen)
(1) Growth parameters and phenology of trees in tropical rain forest
Measurements of tree growth and litter fall were carried out at the Forest Reserve in Pasoh and Semangkok and FRIM campus. Among 37 species(170 individuals), ca. 50% showed less than 1mm・yr-1 of growth rate of trunk diameter. The growing season of trunk diameter was synchronized with the precipitation. The diameter growth in some species was coincided with the leaf fall while other species fell leaves irregularly. Judging from the pattern of leaf fall, the life span of leaves was approximately six months in most species, but some had a leaf life span of more than two years.
(2) Species composition and phytodiversity of Malaysian pteridophytes
Phytodiversity of pteridophytes were surveyed at seven localities in three regions of Malay archipelago during 1992-1995. Mean number of pteridophytes species in a cube of 5m x 5m x 5m was 2.5-3.1 for Semangkok, 0.7-1.3 for Kepong and 0.9-2.2 for Pasoh; and in a cube of 1m x 1m x 1m was 1.2-1.6, 0.7-1.1 and 0.7-2.1, respectively. On the selected 40 cubes of 5m x 5m x 5m, α-(MNS: mean number of species), β-(TNS/MNS) and γ-(total number of species) diversities (D) were culculated and shown. The highest α-D was found in Semangkok forest and the lowest is in forest gap in Pasoh. The highest β-D is found in Pasoh forest gap and the lowest was on the oil palm trunk. The highest γ-D is Semagkok and the lowest on the oil palm trunk. Relative species frequency showed a limited dominant species in natural forest in contrast to several dominance on oil palm trunks managed by human activity.
Diameter Growth, Malaysia, Phenology, Phytodiversity of Pteridophytes, Tropical Forest