THE MALAYSIAN FORESTER 72 (1): 117-133 (2009) COMMUNITY STRUCTURE, DIVERSITY AND BIOMASS OF TREES IN TWO FOREST SUBTYPES OF PEKAN FOREST RESERVE, PAHANG, MALAYSIA ISMAIL, P., 1 * NIZAM, M.S., 2 FARIDAH-HANUM, I., 3 1 1 1 KHALI AZIZ, H. , SHAMSUDIN, I., SAMSUDIN, M. AND A. LATIFF 2 1 Forest Research Institute Malaysia (FRIM), Kepong 52109 Selangor, Malaysia. 2 School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia. 3 Faculty of Forestry, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia. * Corresponding author:
[email protected] Abstract: Two one-ha ecological plots representing Kempas-Ramin-Durian and Durian-Nyatoh forest subtypes were established in Compartment 156 and Compartment 200, respectively at Pekan Forest Reserve, Pahang to determine community structure, diversity and biomass of trees. All trees of 10 cm diameter at breast height and above were enumerated in the plots. Results showed that although tree stocking was almost similar in the two forest subtypes, the basal area, volume and total tree biomass were higher in the Kempas-Ramin-Durian subtype. Shannon-Weiner diversity index, H’ obtained in the Durian-Nyatoh subtype was however, significantly higher (p<0.05) than Kempas-Ramin Durian subtype. Morisita’s Index of Dispersion (Id) showed a random distribution pattern for both forest subtypes. Key words: Forest subtypes, taxonomic composition, community structure, INTRODUCTION The peat swamp forests (PSF) of the Pekan District, Pahang, which included the Pekan Forest Reserve (FR) was first classified using the photo-interpretation method (Chong 1965). A more comprehensive work in the South-East Pahang Peat Swamp Forest (SEPPSF) by Blackett and Wollensen (2005) recognized 13 forest subtypes; these subtypes were further refined by UNDP/GEF (2006) based on species distribution and dominance.