Tree Community Structure and Aboveground Carbon Stock of Sacred Forest in Pasaman, West Sumatera

Abstract

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 representative account of the structure and composition of tree community of the sacred forest; 2. to estimate the Aboveground Carbon Stock (c-Stock) accumulated on the tree community. A one-hectare plot was divided into 25 subplots of 20 x 20 m each for tree and debris data collection. In each subplots, there were a 5 x 5 m sapling subplots. Planting of 1 x 1 m seedling, understorey plant and litter subplots were nested inside. A total of 446 trees were recorded, representing 139 species from 49 families with a total basal area of 38.59 m2. The most dominant tree species was Campnospemza anriculata pmportance Value (IV) of 19.1 91. The other prevalent species were Ficus benjamina (IV ~ 1 6 . 5 0 ) and Mallotzls caudatus (IV ~14.78) . A total of 62 species (44.6O/o) was considered locally rare with density of 1 tree/ha. Mallotzls candatus had the highest density (37 trees/ha) and Ficus benjamina had the highest Basal Area P A ) (5.61 m2 = 14.51% of the total). Euphorbiaceae (IV= 37.40) was the dominant family. The richest families were Euphorbiaceae (10) and Lauraceae (10). The total estimated Aboveground C-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 and C-Stock of Bakit Badindiang sacred forest were relatively higher than those in several disturbed lowland forests in Sumatera.