Globally, sea levels are rising due to climate change which would influence the salinity levels in mangroves. In the framework of this study, we focused on the influence of salinity and differences of forest structure on the fine root biomass (FRB) and carbon stocks in the Sundarbans mangrove forest, Bangladesh. Also, the relationships FRB to different stand structural parameters were investigated using the data obtained from 50 sample plots (100 sq. m each) in different salinity zones in Sundarbans. Four random soil samples (30 cm in length) were taken within study plots, which were further divided into 10 cm, 20 cm, and 30 cm to identify the most active soil layer for FRB stocks. Results suggest differences in forest structural parameters and diversity indices with salinity changes in different saline zones. The low and medium saline zone is dominated by Heriteira fomes, while Excoecaria agallocha dominates the high saline zone. The carbon stocks (Mg C ha⁻¹) in Sundarbans show a significant decrease with increasing salinity in different saline zones, e.g. oligohaline (252 ± 60.2), mesohaline (199 ± 37.7), and polyhaline (171 ± 20.0) zone. FRB carbon (Mg C ha⁻¹) allocation in different saline zones also followed a decreasing order, such as oligohaline (12.8), mesohaline (7.9), and polyhaline (7.3). Fine root biomass showed a decreasing trend with increasing soil depth, where the differences, however, were not significant (p > 0.05) among the soil layers. Our results provide evidence on FRB variations in Sundarbans, which has implications on the mangrove species conservation and management. The mature stands at different saline zones of Sundarbans mangrove forest, Bangladesh has a high fine root biomass, which is valuable for mangrove restoration and the studied species plantation in the shore line or coastal area which can help to decrease the erosion effects of tidal inundation.

在全球范围内，由于气候变化导致海平面上升，这将影响红树林的盐度水平。在这项研究的框架内，我们重点研究了盐度和森林结构差异对孟加拉国桑达尔班红树林的细根生物量（FRB）和碳储量的影响。此外，还使用从Sundarbans不同盐度区的50个样地（每个100平方米）获得的数据研究了FRB与不同林分结构参数的关系。在研究区内采集了四个随机的土壤样品（长度为30 cm），将其进一步分为10 cm，20 cm和30 cm，以识别FRB种群中最活跃的土壤层。结果表明，在不同盐渍区，森林结构参数和多样性指数随盐度变化而不同。Heriteira fomes，而Excoecaria agallocha占据了高盐度区。在不同盐渍区，例如低盐（252±60.2），中盐（199±37.7）和多盐（171±20.0）等盐渍区，盐度增加时，苏达班地区的碳储量（Mg C ha ^-1）显着降低。FRB碳（Mg C ha ^-1）在不同盐分区域的分配也按照降序排列，例如寡盐（12.8），中盐（7.9）和多盐（7.3）。细根生物量随土壤深度的增加呈下降趋势，但在各土壤层之间差异不显着（p> 0.05）。我们的结果提供了有关Sundarbans中FRB变化的证据，这对红树林物种的保护和管理产生了影响。成熟的林分位于桑达尔班斯红树林的不同盐分带，孟加拉国具有很高的细根生物量，这对于恢复红树林和研究沿岸或沿海地区的物种种植具有重要价值，这有助于减少潮汐泛滥的侵蚀作用。