Model persamaan alometrik massa karbon akar dan root to shoot ratio biomassa dan massa karbon pohon Mangium (Acacia mangium Wild): studi kasus di BKPH Parung Panjang, KPH Bogor, Perum Perhutani unit III, Jawa Barat dan Banten
Abstract
Climate change is one of the current important environmental problems due to global warming which is caused by the increase of green house gasses concentration in the atmosphere. Through the process of photosynthesis, vegetation absorbs carbon and releases the carbon through the process of respiration. In this process, vegetation uses CO2 for the process of photosynthesis and produces O2 and energy. Some energy is stored in form of biomass. Acacia mangium is a tree species that belong to fast growing species and it is estimated to have high capability to absorb carbon. Therefore the planting of A. mangium is an important mitigation effort to reduce CO2 concentration in the atmosphere. This study had objective to obtain the model of allometric equations for the mass of tree roots of A. mangium, root to shoot ratio of biomass and carbon mass of A. mangium trees. Selection of sample trees on each dimater class was carried out by purposive sampling method. Estimation of carbon mass was applied for each part of tree consisting of roots, stems, twigs, branches, and leaves. Laboratory works were conducted for the tree samples to identify carbon content of every part of the trees. The model of allometric equation for A. mangium roots carbon mass to the diameter of trees was CA = 0,0048977D2,56 and the model of allometric equation for A. mangium roots biomass to the diameter of trees was WA = 0,00134896D2,46. The models of allometric equations for carbon mass of A. mangium tree roots to above ground biomass of tree carbon were as follows: root carbon mass to the carbon mass of stem was CA = 0,176197MB1,05, root carbon mass to the carbon mass of branches was CA = 11,74897MC0,418, root carbon mass to the carbon mass of twigs was CA = 1,706082MR1,08, root carbon mass to the carbon mass of leaves was CA = 1,261827MD1,33. Meanwhile, the model of estimation of root carbon mass to the mass of above ground trees was CA = 0,103038MT1,07 Root to shoot ratios of A. mangium tree biomass to the above ground biomass of trees were the followings; (a) root to shoot ratio of tree root biomass to the biomass of tree stem was 0,2934. (b) root to shoot ratio of tree root biomass to the biomass of all tree parts was 0.2080.Root to shoot ratios of carbon mass of A. mangium were as follows: (a) root to shoot ratio of carbon mass of tree root to the carbon mass of tree stem was 0.2437. (b) root to shoot ratio of carbon mass of tree root to the carbon mass of all above ground tree parts was 0.1952.
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