Globally, mangroves sequester a large amount of carbon into the sediments, although spatial heterogeneity exists owing to a wide variety of local, regional, and global controls. Rapid environmental and climate change, including increasing sea-level rise, global warming, reduced upstream discharge and anthropogenic activities, are predicted to increase salinity in the mangroves, especially in the Bangladesh Sundarbans, thereby disrupting this blue carbon reservoir. Nevertheless, it remains unclear how salinity affects the belowground soil carbon despite the recognised effect on above ground productivity. To address this gap, research was undertaken in the Bangladesh Sundarbans to compare total soil organic carbon (SOC) across three salinity zones and to explore any potential predictive relationships with other physical, chemical properties and vegetation characteristics. Total SOC was significantly higher in the oligohaline zone (74.8 ± 14.9 Mg ha⁻¹), followed by the mesohaline (59.3 ± 15.8 Mg ha⁻¹), and polyhaline zone (48.3 ± 10.3 Mg ha⁻¹) (ANOVA, F_{2, 500 =} 118.9, p < 0.001). At all sites, the topmost 10 cm of soil contained higher SOC density than the bottom depths (ANOVA, F_{3, 500 =} 30.1, p < 0.001). On average, Bruguiera sp. stand holds the maximum SOC measured, followed by two pioneer species Sonneratia apetala and Avicennia sp. Multiple regression results indicated that soil salinity, organic C:N and tree diameter were the best predictor for the variability of the SOC in the Sundarbans (R² = 0.62). Despite lower carbon in the soil, the study highlights that the conservation priorities and low deforestation rate have led to less CO₂ emissions than most sediment carbon-rich mangroves in the world. The study also emphasised the importance of spatial conservation planning to safeguard the soil carbon-rich zones in the Bangladesh Sundarbans from anthropogenic tourism and development activities to support climate change adaptation and mitigation strategies.

在全球范围内，尽管由于各种地方，区域和全球控制因素而存在空间异质性，但红树林仍将大量碳封存到沉积物中。迅速的环境和气候变化，包括海平面上升，全球变暖，上游排放量减少和人为活动的增加，预计将增加红树林（尤其是孟加拉国桑达尔邦）的盐度，从而破坏该蓝碳储量。然而，尽管盐分对地上生产力产生了公认的影响，但仍不清楚盐度如何影响地下土壤的碳。为了解决这一差距，孟加拉国Sundarbans进行了研究，比较了三个盐渍区的土壤有机碳总量（SOC），并探索了与其他物理，有机碳的潜在预测关系。化学性质和植被特征。少盐区的总SOC显着更高（74.8±14.9 Mg ha^-1），其次是中卤（59.3±15.8 Mg ha ^-1）和多卤带（48.3±10.3 Mg ha ^-1）（ANOVA，F 2，500 ₌ 118.9，p  <0.001）。在所有地点，最顶层的10厘米土壤的SOC密度均高于底层深度（方差分析，F 3，500 ₌ 30.1，p  <0.001）。平均而言，Bruguiera sp。展位拥有测得的最大SOC，其次是两个先驱物种Sonneratia apetala和Avicennia sp。多元回归结果表明，土壤盐度，有机碳氮和树木直径是苏达邦地区SOC变化的最佳预测因子（R ² = 0.62）。尽管土壤中的碳含量较低，但该研究强调指出，与世界上大多数富含碳的沉积物红树林相比，保护重点和低森林砍伐率导致的CO ₂排放量减少。该研究还强调了空间保护计划的重要性，以保护孟加拉国Sundarbans的土壤碳富集区免于人为旅游和开发活动，以支持气候变化适应和缓解策略。