PERSAMAAN ALOMETRIK DAN CADANGAN KARBON VEGETASI PADA HUTAN GAMBUT PRIMER DAN BEKAS TERBAKAR

Abstract

Bio-sequestration is one of the important carbon stock management that was underlined in several international meetings. Data on carbon stocks of vegetation and peat soil are very important to minimize variation of the carbon stock estimates in peat forests. The objectives of this research were to formulate the allometric equation for estimating tree biomass of the primary and burnt peat forests and to analyze the vegetation carbon stocks of the primary and burnt peat forests. The research was carried out in the primary peat forest (HGP), peat forest repeatedly-burnt annualy (HG 1), peat forest three years after fire (HG 3), and peat forest eight years after fire (HG 8). Cluster plots were established in each forest type representing the period after burning and undisturbed condition. Each cluster plot consisted of four circular subplots (radius of 7.32 m) and four circular annular plots (radius of 17.95 m). The total number of both circular subplots and annular plots was 16 respectively. Data on biomass carbon stock were collected on those plots. Results of this research showed that for estimating total tree biomass for all cluster, the most reliable allometric equation was Y = 0.061 (DBHxρxT) 1.464 .General allometric equation of all cluster is used for users in the field to calculate of stand biomass carbon stock. This general equation can be applied in all cluster due to the similarity of rainfall climatic zone range as 2,621-3,339 mm/year belongs to climatic zone of moist 1,500-4,000 mm/year (Brown et al., 1989). Allometric equation in each cluster was used for estimation of stand biomass carbon stock in each cluster. The most reliable allometric equation in primary peat forest was Y = 0.040 (DBHxρxT) 1.52 ; in peat forest repeatedly-burnt annualy was Y = 0.098 (DBH) 2.350 ; in peat forest three years after fire was Y = 0.084 (DBHxρxT) 1.376 ; in peat forest eight years after fire was Y = 0.024 (DBHxρxT) 1.667. Total carbon stock from understorey, seedlings, saplings, poles and trees were 73.08 tonC/ha at HGP; 4.93 tonC/ha at HG 1 ; 13.64 tonC/ha at HG 3 ; and 26.13 tonC/ha at HG 8 , respectively.