This study covered spatial distribution of mangrove biomass, litter fall and intertidal sediment organic carbon storage pattern in the Indian part of the world’s largest mangrove forest, the Sundarbans. The above and below ground (AGB and BGB) biomass spatially varied with high (57.28 ± 3.17 and 28.24 ± 2.64 Mg ha⁻¹), moderate (44.81 ± 8.13 and 20.88 ± 1.41 Mg ha⁻¹) and low (18.97 ± 3.58 and 9.58 ± 0.87 Mg ha⁻¹) for inner, middle and outer zones of the mangrove biosphere. Trunk, branch and leaves formed 45.8, 34.7 and 19.5% of AGB. The AGB: BGB was 2.07 indicating more carbon stock in trunk than root. Predominant mangroves genus Avicennia contributed 57% of plant biomass. Pore-water salinity negatively regulated the distribution of plant biomass. Mean AGB (40.35 Mg ha⁻¹) and BGB (19.57 Mg ha⁻¹) and mean carbon content (40.5%) yielded 10.35 Tg carbon stock in Indian Sundarbans. Litter fall varied from 8.95 to 12.30 Mg ha⁻¹ yr⁻¹, supplying annually 284.7 Gg organic carbon to sediment. Sediment organic carbon (SOC) content varied from 0.92 to 3.29% (avg. 1.99%) building up an organic carbon stock of 59.14 Tg up to 90 cm depth of the intertidal sediment column. Organic carbon, humic acid (HA) and fulvic acid (FA) in sediment showed a decreasing trend with depth indicating organic matter decomposition and depletion of HA and FA accumulation rate. Based on mean concentration of HA and FA as 300 µg g⁻¹ and 571 µg g⁻¹ and their respective carbon percentage as 54.25 and 46.23, refractory organic carbon stock in the intertidal mangrove sediment was estimated as 1.7 Tg.

这项研究涵盖了世界上最大的红树林森达班地区印度部分的红树林生物量，凋落物下降和潮间带沉积物有机碳存储模式的空间分布。地上和地下（AGB和BGB）生物量在空间上有高（57.28±3.17和28.24±2.64 Mg ha ^-1），中度（44.81±8.13和20.88±1.41 Mg ha ^-1）和低（18.97±3.58和在红树林生物圈的内部，中部和外部区域为9.58±0.87 Mg ha ^-1）。树干，树枝和树叶分别占AGB的45.8、34.7和19.5％。AGB：BGB为2.07，表明树干中的碳储量比根部高。红树林属Avicennia贡献了植物生物量的57％。孔隙水盐度负调控植物生物量的分布。印度桑达班地区的平均AGB（40.35 Mg ha ^-1）和BGB（19.57 Mg ha ^-1）和平均碳含量（40.5％）产生10.35 Tg碳储量。凋落物下降范围从8.95到12.30 Mg ha ^-1  yr ^-1，每年向沉积物中提供284.7 Gg有机碳。沉积物有机碳（SOC）含量从0.92％到3.29％（平均1.99％）不等，在潮间带沉积物柱深90厘米处积累了59.14 Tg的有机碳。沉积物中的有机碳，腐殖酸（HA）和黄腐酸（FA）随着深度的增加呈下降趋势，说明有机质分解，腐殖质的耗竭和FA的积累速率降低。根据HA和FA的平均浓度分别为300 µg g ^-1和571 µg g ^-1以及它们各自的碳百分比分别为54.25和46.23，潮间带红树林沉积物中难处理的有机碳储量估计为1.7 Tg。