Pendugaan Biomassa dan Simpanan Karbon Tegakan Hutan pada Lahan Mineral dan Gambut

Abstract

Hutan tanaman industri (HTI) berperan penting dalam penyerapan karbon, namun informasi biomassa dan simpanan karbon berdasarkan umur pada tegakan HTI di lahan mineral dan gambut. Penelitian ini bertujuan menduga volume tegakan, biomassa atas permukaan, dan simpanan karbon Acacia crassicarpa di lahan gambut dan Eucalyptus pellita di lahan mineral pada umur 1, 2, dan 3 tahun di PT Arara Abadi. Data dikumpulkan dari 36 plot lingkaran berradius 11,29 m; volume diduga dengan rumus silinder berfaktor bentuk 0,7, biomassa dengan persamaan alometrik spesifik jenis, dan karbon dengan faktor konversi 0,47. Volume, biomassa, dan simpanan karbon kedua jenis meningkat seiring bertambahnya umur. Volume Acacia crassicarpa sebesar 22,08, 86,11 dan 110,96 m³/ha, sedangkan Eucalyptus pellita 28,61, 74,43 dan 91,28 m³/ha. Biomassa Acacia crassicarpa sebesar 10,55, 39,01 dan 51,47 ton/ha (karbon 4,96, 18,33 dan 24,19 tonC/ha), sedangkan Eucalyptus pellita 23,50, 62,95 dan 82,27 ton/ha (karbon 11,04, 29,59 dan 38,67 tonC/ha).

Industrial plantation forests play an important role in carbon sequestration, yet age-based information on biomass and carbon stock across different stand ages on mineral and peat soils is still limited. This study aimed to estimate stand volume, aboveground biomass, and carbon stock of Acacia crassicarpa on peatland and Eucalyptus pellita on mineral soil at ages 1, 2, and 3 years at PT Arara Abadi. Data were collected from 36 circular plots with a radius of 11.29 m; volume was estimated using the cylinder formula with a form factor of 0.7, biomass using species-specific allometric equations, and carbon using a conversion factor of 0.47. Volume, biomass, and carbon stock of both species increased with age. Volume of Acacia crassicarpa was 22.08, 86.11, and 110.96 m³/ha, while Eucalyptus pellita was 28.61, 74.43, and 91.28 m³/ha. Aboveground biomass of Acacia crassicarpa was 10.55, 39.01, and 51.47 ton/ha (carbon 4.96, 18.33, and 24.19 tonC/ha), while Eucalyptus pellita was 23.50, 62.95, and 82.27 ton/ha (carbon 11.04, 29.59, and 38.67 tonC/ha).