Analysis of crganic carbon burial characteristics in mangrove sediments on Maoyan Island
lhe northem mangrove wetlands of Maoshan Island were taken as the study area to investigate the characteristics and sources of organic carbon burial in the sediments.The sedimentation rate(SAR),organic carbon density,burial rate(OCAR),potential sources of organic carbon,and contribution rates were analyzed using the constant sedimentation rate model based on radiogenic isotopes(210Pb).The sedimentation rate in the Maoshan Island mangrove wetlands was approximately 1.8cm/year.The sediments were mainly composed of silt and clay,with particle size remaining stable with depth.A good correlation was observed between excess 210Pb activity and depth,indicating a stable sedimentary environment.The average organic carbon density of the sediments was 0.66g/cm3,and the burial rate was 120.01g/(m2·a).The distribution characteristics of stable carbon and nitrogen isotopes,combined with the multivariate mixing model(IsoSource),showed that the sources of organic carbon in the sediments were mainly a mixture of marine and terrestrial origins,with marine sources accounting for 50.3％,terrestrial sources for 33.4％,and tree sources contributing 16.3％.Surface sediments were primarily influenced by terrestrial and tree inputs,with the highest contribution rate from tree sources reaching 46.4％.The composition of mangrove vegetation and the time since forest establishment were important factors affecting the burial of organic carbon in the sediments.
万方数据
维普
