Balikpapan Botanic Garden has 309.22 hectare, within the 10,000 hectare Wain River forest conservation area, in East Kalimantan, Indonesia. One of the roles of the Botanic Garden is as a provider of environmental services. This encompasses contributing to effort in reducing global warming by producing biomass and storing carbon reserves. The aims of the research were to estimate the magnitude of the biomass and carbon stocks in the Balikpapan Botanic Garden as well as to determine the percentage contribution of forest components make to the carbon stock. Primary data was collected from the Botanic Garden precincts using a combination of transects and quadrat plots deploying a purposive sampling procedure. From each sampling unit, data was
systematically collected for living trees, necromass (mass of dead timber), ground cover, litter and soil. A nondestructive method was used to estimate the potential biomass and carbon of the living trees whereas a destructive determination of biomass was used for ground cover and litter. The Balikpapan Botanic Garden plays a major role in conserving biomass and carbon stocks. The average biomass and carbon stock determined across sampling sites in the Balikpapan Botanic Garden was 203 ton/ha and 142 ton/ha, respectively. The total amount of biomass and carbon held in the Garden was estimated at 58,990 ton and 41,050 ton, respectively. The largest contribution to the carbon stocks is in the form of living trees (49% of the total carbon stock) and
soil (28% of the total carbon stock)
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