TREE COMMUNITY STRUCTURE AND ABOVEGROUND CARBON STOCK OF SACRED FOREST IN PASAMAN, WEST SUMATERA

This is an analysis of the composition and structure of tree community of Bukit Badindiang sacred forest in Nagari Simpang, Pasaman, West Sumatera Province, Indonesia. The study aimed to: 1. to obtain a representativeaccount of the structure and composition of tree community of the sacred forest; 2. to estimate theAboveground Carbon Stock (c-Stock) accumulated on the tree community. A one-hectare plot was divided into25 subplots of 20 x 20 m each for tree and debris data collection. In each subplots, there were a 5 x 5 m saplingsubplots. Planting of 1 x 1 m seedling, understorey plant and litter subplots were nested inside. A total of 446trees were recorded, representing 139 species from 49 families with a total basal area of 38.59 m2. The mostdominant tree species was Campnospemza anriculata pmportance Value (IV) of 19.1 91. The other prevalent specieswere Ficus benjamina (IV =16.50a)n d Mallotzls caudatus (IV =14.78)A. total of 62 species (44.6O/o) was consideredlocally rare with density of 1 tree/ha. Mallotzls candatus had the highest density (37 trees/ha) and Ficus benjaminahad the highest Basal Area PA) (5.61 m2 = 14.51% of the total). Euphorbiaceae (IV= 37.40) was the dominantfamily. The richest families were Euphorbiaceae (10) and Lauraceae (10). The total estimated AbovegroundC-Stock was 190.62 MgC/ha, with the highest C was contributed by trees (178.85 MgC/ha or 93.8% of total).Trees with diameter class of 10 - 69.99 cm stored 62% of total tree carbon. The species richness, tree density andC-Stock of Bakit Badindiang sacred forest were relatively higher than those in several disturbed lowland forests inSumatera