<![CDATA[The mangrove ecology at Kertomulyo Beach has notably grown as results of rehabilitation endeavors particularly planting projects initiated in 2009 and consistently executed since 2017, enlarging the area from 9.9 hectares to 21 hectares by 2021. This research sought to ascertain the density and Importance Value Index (IVI) of mangroves, evaluate carbon storage in the stands mangrove, and investigate the correlation between Diameter at Breast Height (DBH) and carbon storage. The study was carried out in February 2026 at Kertomulyo Beach. Data were gathered at three locations, each comprising three plots of 10 x 10 meters. Mangrove density, occurrence, and dominance metrics were utilized to compute the IVI. The assessment of carbon sequestration in the mangrove ecosystems was conducted with a non-invasive technique grounded in allometric equations. Statistical evaluations, such as Pearson correlation and polynomial regression, were utilized to examine the association between stand density and carbon sequestration. The findings reveal that the mangrove density across all three locations is elevated; Station III demonstrated the greatest density at 2,900 individuals/ha (Rhizophora mucronata), whilst the highest IVI of 104.36% was noted at Station I (Avicennia alba). Carbon sequestration in the mangrove ecosystems reached 150.51 tons C/ha for above-ground biomass (AGB) and 66.77 tons C/ha for below-ground biomass (BGB), culminating in an overall carbon storage of 217.28 tons C/ha. Correlation research reveals that carbon storage in mangrove stand biomass exhibits a robust, significant positive correlation with DBH (R = 0.9801), whereas mangrove density demonstrates a feeble, significant negative correlation (R = -0.418).]]>
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