Saria Anasia Elingaya, Li Xiuzhen, Li Tianyou, Mgalula Michael Elias, Seki Hamidu, Du Jinzhou
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China.
University of Dar Es Salaam, Mkwawa University College of Education, Iringa, Tanzania.
Environ Monit Assess. 2025 Jul 5;197(8):867. doi: 10.1007/s10661-025-14307-9.
Mangrove forests offer a wide range of ecosystem services, including coastal protection and climate regulation. These ecosystems serve as significant carbon sinks, effectively sequestering and storing carbon in their biomass and sediments. However, various human activities have an impact on carbon stocks in mangroves. The current study quantifies the carbon stored in mangrove forests of the Mtoni estuary in Dar es Salaam and the Kisiju estuary in Pwani, Tanzania, from 40 random sampling plots. Seven species of mangroves Avicennia marina (Forssk.) Vierh (Acanthaceae), Bruguiera gymnorrhiza (L.) Lam. (Rhizophoraceae), Ceriops tagal (Perr.) C. B. Rob, Heritiera littoralis Dryand. (Malvaceae), Xylocarpus granatum Koen. (Meliaceae), Sonneratia alba J. Smith (Lythraceae), and Rhizophora mucronata Lam were identified. Allometric models were used to estimate aboveground carbon (AGC) and belowground carbon (BGC). An organic elemental analyser determined the organic carbon content in the sediments, followed by calculations using a specific equation for soil organic carbon (SOC) content. Analysis revealed that the mean total carbon stock density in the Mtoni estuary is 334.7 ± 37.88 t/ha, which is equivalent to 1228 t CO ha. In contrast, Kisiju stored 345.6 ± 31.7 t/ha, which is equivalent to 1268 t CO ha. AGC averages 36.81 ± 7.06 t/ha in Mtoni and 70.65 ± 8.83 t/ha in Kisiju, whereas BGC averages 6.52 ± 1.23 t/ha and 16.61 ± 1.71 t/ha, respectively. The SOC density is greater in Mtoni at 291.45 ± 29.59 t/ha than that in Kisiju at 258.45 ± 21.16 t/ha, constituting 82% of the total carbon pool. The capacity of carbon storage in these mangrove ecosystems highlights their role in mitigating climate change. Nonetheless, fluctuations in carbon stores can be attributed to factors such as conservation status, deforestation rates, salinity, sediment deposition, ecosystem productivity, human disturbances, and urban pollution. The findings highlight the need for further conservation measures to enhance carbon storage and address climate change, offering critical information to policymakers.
红树林提供了广泛的生态系统服务，包括海岸保护和气候调节。这些生态系统是重要的碳汇，能有效地将碳固存并储存在其生物量和沉积物中。然而，各种人类活动对红树林中的碳储量产生了影响。本研究对坦桑尼亚达累斯萨拉姆的姆托尼河口和普瓦尼的基西朱河口红树林中的碳储量进行了量化，样本来自40个随机抽样地块。共识别出7种红树林物种，分别是白骨壤（Avicennia marina (Forssk.) Vierh，爵床科）、木榄（Bruguiera gymnorrhiza (L.) Lam.，红树科）、角果木（Ceriops tagal (Perr.) C. B. Rob）、海莲（Heritiera littoralis Dryand. , 锦葵科）、大红树（Xylocarpus granatum Koen.，楝科）、杯萼海桑（Sonneratia alba J. Smith，千屈菜科）和红茄苳（Rhizophora mucronata Lam）。采用异速生长模型估算地上碳（AGC）和地下碳（BGC）。使用有机元素分析仪测定沉积物中的有机碳含量，然后通过特定公式计算土壤有机碳（SOC）含量。分析表明，姆托尼河口的平均总碳储量密度为334.7±37.88吨/公顷，相当于1228吨二氧化碳/公顷。相比之下，基西朱河口的碳储量为345.6±31.7吨/公顷，相当于1268吨二氧化碳/公顷。姆托尼河口的AGC平均为36.81±7.06吨/公顷，基西朱河口为70.65±8.83吨/公顷，而BGC平均分别为6.52±1.23吨/公顷和16.61±1.71吨/公顷。姆托尼河口的SOC密度更大，为291.45±29.59吨/公顷，高于基西朱河口的258.45±21.16吨/公顷，占总碳库的82%。这些红树林生态系统的碳储存能力凸显了它们在缓解气候变化方面的作用。尽管如此，碳储量的波动可归因于多种因素，如保护状况、森林砍伐率、盐度、沉积物沉积、生态系统生产力、人类干扰和城市污染。研究结果强调需要采取进一步的保护措施来增强碳储存并应对气候变化，为政策制定者提供了关键信息。
