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This study aimed to assess aboveground carbon sequestration in sago palm (Metroxylon sagu Rottb.) growing naturally in wetland areas with different soil properties, by comparing Khok Saba Subdistrict and Na Khao Sia Subdistrict, Nayong District, Trang Province. Field surveys were conducted in 20 plots per subdistrict, each measuring 5 × 20 m. Stem circumference at breast height (1.3 m) and tree height were measured to estimate aboveground biomass and carbon sequestration using allometric equations. Soil properties, including pH and macronutrient contents (N, P, and K), were also analyzed. The results showed that Khok Saba Subdistrict contained 89 sago palms, which was higher than Na Khao Sia Subdistrict with 61 palms, resulting in greater total aboveground biomass (1,024.84 tons) and carbon sequestration (481.68 tons) compared to Na Khao Sia Subdistrict, which exhibited 799.62 tons of aboveground biomass and 375.72 tons of carbon sequestration. Although the average height of sago palms in Khok Saba Subdistrict (12.47 m) and Na Khao Sia Subdistrict (13.70 m), as well as the average stem circumference (1.44 and 1.48 m, respectively), were relatively similar, significant differences were observed in soil properties. Soils in Khok Saba Subdistrict had a pH of approximately 4 and high potassium levels, whereas soils in Na Khao Sia Subdistrict had a pH of approximately 8 and low potassium levels. Nitrogen and phosphorus levels in both areas were very low. These findings indicate that sago palm density, together with soil properties—particularly pH and potassium availability—are key factors influencing carbon sequestration potential in sago palm ecosystems