【摘要】 盐沼具有初级生产力高、堆积速率快、分解速率慢等特征，在CO₂的吸收和固定方面有着重要作用。本研究对江苏盐城滨海湿地的互花米草、芦苇、盐地碱蓬和香蒲4种盐沼植被的柱状沉积物进行分析，探讨了植被生物量、沉积物总有机碳（TOC）垂向变化、TOC来源、固碳通量和碳储量。结果显示，总生物量表现为芦苇（5412.59 g/m²）>互花米草（4444.72 g/m²）>香蒲（2819.15 g/m²）>盐地碱蓬（418.50 g/m₂）。决定沉积物TOC垂向分布的主要因子有植被类型、地下生物量和人类扰动。表层沉积物（0～10 cm）中，固碳通量为芦苇[141.38 g/（m²·a）]>香蒲[90.73 g/（m²·a）]>互花米草[75.40 g/（m²·a）]>盐地碱蓬[50.91 g/（m²·a）]，碳储量为芦苇（4.19×10⁴ t C）>互花米草（1.48×10⁴t C）>盐地碱蓬（2.87×10³ t C）。植被生产力与沉积物的堆积速率都在很大程度上影响其固碳通量。更多还原

【Abstract】 Salt marshes are characterized by high primary productivity, rapid accumulation rates, and slow decomposition rates, playing a significant role in CO2 absorption and fixation. In this study, we analyzed sediment cores from four types of salt marsh vegetation in the coastal wetlands of Yancheng, Jiangsu Province:Spartina alterniflora, Phragmites australis, Suaeda salsa, and Typha orientalis. The study investigated vegetation biomass, vertical distribution of total organic carbon(TOC) in sediments, TOC sources, carbon sequestration fluxes, and carbon storage. The results showed that total biomass followed the order of P. australis(5412.59 g/m~2) > S. alterniflora(4444.72 g/m~2) > T. angustifolia(2819.15 g/m~2) > S. salsa(418.50 g/m~2). The vertical distribution of sediment TOC was primarily influenced by vegetation type,belowground biomass, and human disturbances. In the surface sediments(0-10 cm), carbon sequestration fluxes was P. australis [141.38 g/(m~2·a)] > T. orientalis [90.73 g/(m~2·a)] > S. alterniflora[75.40 g/(m~2·a)] >S. salsa [50.91 g/(m~2·a)]. Carbon storage was P. australis(4.19×10~4 t C) > S. alterniflora(1.48×10~4 t C) > S.salsa(2.87×10~3 t C). Both vegetation productivity and sedimentation rate significantly influenced the carbon sequestration fluxes.更多还原