Rhizophora apiculata is the dominant mangrove species found in Pulau Cawan Regency Indragiri Hilir, Riau. The mangrove species has a significant role in carbon sequestration. This aim of this research was to determine of biomass, carbon stock and sequestration of CO2 in R. apiculata, as well as the analysis of soil organic carbon in each layer depth. This research was conducted in September-Nov…