Floristic composition and above rround biomass of tree species at Gunung Stong State Park (GSSP), Dabong, Kelantan.

A study to determine the composition, species diversity, and estimate the aboveground biomass of tree species was conducted in Gunung Stong State Park. Five plots were set up with 20 m by 20 m each with an area of 0.2 ha in this study and all trees with a diameter at breast level (DBH) of 10 cm and above were measured and recorded. A total of 131 trees, representing 25 species and 19 genera from 13 families, were surveyed in a 0.2 ha plot. The largest family in the study area is Dipterocarpceae, which is represented by 3 genera and 6 species, followed by the Myrtaceae family, which is represented by 1 genus and 3 species. The value of the Shannon-Wiener Diversity Index (H) in the study area is high, which is 2.90 (H'max = 2.68). Shorea genus from the Dipterocarpaceae family has the highest basal area of 32.485 m/ha, followed by the Horsfieldia genus from the Myristicaceae family with an area of 10.232 m/ha. Shorea platyclados has the highest basal area of 8.389 m2/ha, followed by Shorea parvifolia with an area of 5.598 m2/ha. The above-ground biomass value estimated for the entire study plot is 298.762 t/ha. The genera that contribute the highest biomass in the study plot are the Shorea genera, with an estimated biomass of 182.709 t/ha, followed by the Horsfielda genera, with an estimated biomass of 29.206 t/ha. The species that contributed the highest biomass was Shorea platyclados (Dipterocarpaceae), with an estimated biomass of 95.170 t/ha, followed by Shorea spp. (Dipterocarpaceae), with an estimated biomass of 34.429 t/ha.