| Summary: | Trees in forest have a contribution to global carbon cycle. They absorb carbon (C) from atmosphere for their growth. Since their capacity for absorbing carbon can be quantified, it would be taken into account for sustainable forest management. Therefore, a research for measuring carbon in accordance with scientific rules is necessary. A study have been conducted that aimed to quantify the potential of trees and biomass to absorb carbon through direct measurement using carbonation method, and also to understand the capacity of forests in absorbing CO2. The research was conducted in forest plantation of Acacia crassicarpa in peat-land area. Potential forest capacity in carbon absorption was assessed through sampling inventory conducted in age classes (1st until 8th). Biomass was measured using the "destructive sampling" technique within 23 trees of samples. Carbon measurement was conducted by using carbonation method (make charcoal from the sample trees). Carbon analysis was carried out on carbonation products include charcoal, gas and liquid smoke. Potential CO2 adsorption was estimated from the carbon stock of trees with heavy mass conversion. Potential standing stock in forest plantation of Acacia crassicarpa is 141,40 m3/ha. It is equal to 62,21 tons/ha in dry weight, with The Mean Annual Volume Increment (MAVI) is 29,87 m3/ha/thn. The potential biomass is 123.68 ton/ha with the value of Biomass Expansion Factor (BEF) is 1,59. The average carbon content of biomass for carbonation method is 37,84%. The potential absorption of carbon is 45,64 tC/ha, which distributes on the stem (66%), branches (17%), roots (14%) and leaves (4%). Mean Annual Carbon Increment (MACI) is 10.22 tC/ha. CO2 absorption capacity of Acacia crassicarpa stands are 167,49 tCO2/ha, and the total of all age-class is 4.9 million tCO2. The allometric equation to estimate the trees biomass is WT = 0.165 D2, 399, and the trees carbon : CT = 0.081 D2, 297.
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