Pendugaan Biomasa di Atas tanah di Ekosistem Hutan Primer dan Hutan Bekas Tebangan (Studi Kasus Hutan Dusun Aro, Jambi)

Abstract

Biomass studies using combination of destructive and non-destructive sampling were conducted in the tropical rain forest of Dusun Aro, Jambi. In non-destructive sampling, biomass density was estimated using algometric equation from Brown (1997) mainly for trees with diameter at breast height greater than 5 cm. The components of above-ground biomass considered in this study were the under storeys, litters, living trees, dead standing trees, felled trees, and stumps (trunks) remained on forest floor. The purpose of the study is to estimate total above-ground biomass per unit area in the primary and logged-over forest. The result shows that total aboveground biomass in the primary forest is higher than logged-over forest. Biomass density of primary forest was estimated of 348.02 ton/ha, while logged-over forest ranged from 189.26 to 221.39 ton/ha. Stand biomass was significantly decreased ranging from 126.63 in logged-over forest of the year 2000 to 158.76 ton/ha in logged-over forest of the year 1998. The main cause of the decreased in majority was illegal logging.