<![CDATA[Rubber plantations (Hevea brasiliensis Müll. Arg.) play an important role in carbon sequestration in tropical regions, including educational land. This study aims to estimate the above-ground biomass (AGB) carbon stock in rubber vegetation at the school garden of SMKN 4 Sampit, Central Kalimantan, using the allometric equation of Chave et al. (2005) with specific wood density correction for Hevea brasiliensis. Data were collected from three 20 m × 20 m measurement plots (400 m² each) with a total of 58 rubber trees. Measured parameters included diameter at breast height (DBH) and tree height. Results showed a mean AGB of 25.37 ± 4.66 Ton ha⁻¹ and a mean carbon stock of 11.92 ± 2.19 Ton C ha⁻¹, equivalent to 43.73 Ton CO₂e ha⁻¹. Carbon stock varied among plots, with Plot 2 being the highest (14.43 Ton C ha⁻¹) and Plot 3 the lowest (10.40 Ton C ha⁻¹). Differences among plots were attributed to variations in DBH, tree height, and stand density. Carbon stock values are consistent with intermediate-age rubber stands and indicate significant carbon storage potential in educational land. This study contributes to the carbon database of Indonesian tropical forests and supports the implementation of REDD+ programs at the site level.]]>
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