夏季澄迈花场湾海草床碳储量及其空间分布特征研究OA

Seagrass beds are the core component of coastal blue carbon ecosystems,and their high-efficiency carbon sequestration and long-term carbon storage functions are of great value for addressing global climate change.The research on the carbon storage characteristics and driving mechanisms of seagrass beds in tropi-cal semi-enclosed bays of the South China Sea remains insufficient,which restricts the accurate assessment,protection,and utilization of regional blue carbon resources.Taking Huachangwan in Chengmai,Hainan as the study area,this study carried out field sampling and laboratory analysis in the summer of 2025.This study systematically revealed the horizontal and vertical spatial distribution patterns of sediment organic carbon content and storage in the seagrass bed,analyzed the regulatory mechanisms of key biological and environ-mental factors,and quantitatively estimated the total carbon storage of the ecosystem.The results showed that the seagrass bed in Huachangwan was a monodominant community of Halophila beccarii,with a patchy spatial distribution pattern.The belowground biomass was(6.19±3.56)g DW/m2,which was significantly higher than the aboveground biomass[(1.30±0.74)g DW/m2].The organic carbon content of the below-ground part(19.14％)was 2.4 times that of the aboveground part(8.07％).The average sediment bulk density was(1.48±0.13)g/cm2,with the average organic carbon content of(1.36±0.23)％,and the organ-ic carbon content reached a peak of(1.65±0.34)％at the 51-100 cm depth in the vertical direction.The mean value of vegetation carbon density was(0.21±0.12)Mg C/hm2,and the mean value of sediment car-bon density at the 100 cm depth was(169.45±48.40)Mg C/hm2.The total regional carbon stock reached 10 482.47 Mg C,with sediment carbon storage accounting for 99.85％of the total.The spatial distribution pattern of seagrass,seagrass biomass,water salinity,dissolved oxygen,dissolved inorganic nitrogen,as well as sediment moisture content and total nitrogen,were the key factors regulating the spatial distribution of or-ganic carbon.This study clarifies the carbon storage and spatial distribution characteristics of small-scale seagrass beds in tropical semi-enclosed bays,providing basic data and scientific support for the ecological pro-tection,restoration,and blue carbon accounting of seagrass beds in similar bays of the South China Sea.