Tisdell Miatta Jarnda, Liu Yuhong, Liu Jiayuan, Som Massou Age, Beyan Flomo M, Oli Ifeanyi Chidozie, Jarnda Kermue Vasco
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environmental Science and Engineering, Hohai University, Nanjing, China.
College of Hydrology and Water Resources, Hohai University, Nanjing, China.
Water Environ Res. 2025 Jun;97(6):e70087. doi: 10.1002/wer.70087.
Wetlands are vital ecosystems for global carbon cycling and storage, acting as significant carbon reservoirs that surpass many other ecosystems in their capacity to sequester carbon. This study investigates the availability and distribution of various forms of organic carbon across different wetland types in Nantong, China, including coastal, freshwater riverine, saltwater riverine, and inland lake wetlands. Soil samples were collected and analyzed for soil organic carbon (SOC), Dissolved Organic Carbon (DOC), Particulate Organic Carbon (POC), Mineral-Associated Organic Carbon (MAOC), And Easily Oxidizable Organic Carbon (EOC). The results reveal that coastal wetlands exhibit the highest mean SOC (19.8974 mg/g) and DOC (0.2585 mg/g) concentrations, indicating their significant role in carbon sequestration. Meanwhile, freshwater riverine wetlands have the highest mean POC (8.3611 mg/g), highlighting their importance in particulate organic carbon storage. Saltwater riverine wetlands demonstrate significant carbon sequestration potential, with the highest total carbon content (122.53 mg/g). Correlation analysis shows that the levels of ammonia are positively related to SOC, DOC, MAOC, and EOC. This means that the ammonia levels encourage microbes to work harder and break down organic matter faster. Conversely, nitrite levels negatively impact SOC, DOC, and MAOC. These findings underscore the importance of wetland type and environmental conditions in determining carbon storage and turnover. The study provides critical insights for wetland conservation and management strategies aimed at mitigating climate change and preserving biodiversity. PRACTITIONER POINTS: Coastal wetlands show the highest mean SOC and DOC, indicating significant carbon sequestration potential and nutrient availability. Freshwater riverine wetlands have the highest POC levels, highlighting their role in particulate organic matter accumulation. Saltwater riverine wetlands demonstrate substantial total carbon content, showing resilience in saline conditions. Ammonia positively influences SOC, DOC, MAOC, and EOC, enhancing microbial activity and organic matter decomposition. Variability in carbon content across wetland types emphasizes the need for tailored conservation and management strategies.
湿地是全球碳循环和储存的重要生态系统，作为重要的碳库，其固碳能力超过许多其他生态系统。本研究调查了中国南通不同湿地类型（包括沿海、淡水河流、咸水河流和内陆湖泊湿地）中各种有机碳形式的可用性和分布。采集土壤样本并分析土壤有机碳（SOC）、溶解有机碳（DOC）、颗粒有机碳（POC）、矿物相关有机碳（MAOC）和易氧化有机碳（EOC）。结果表明，沿海湿地的平均SOC（19.8974mg/g）和DOC（0.2585mg/g）浓度最高，表明它们在碳固存中发挥着重要作用。同时，淡水河流湿地的平均POC（8.3611mg/g）最高，突出了它们在颗粒有机碳储存中的重要性。咸水河流湿地显示出显著的碳固存潜力，总碳含量最高（122.53mg/g）。相关性分析表明，氨水平与SOC、DOC、MAOC和EOC呈正相关。这意味着氨水平促使微生物更努力工作并更快分解有机物质。相反，亚硝酸盐水平对SOC、DOC和MAOC有负面影响。这些发现强调了湿地类型和环境条件在决定碳储存和周转方面的重要性。该研究为旨在缓解气候变化和保护生物多样性的湿地保护和管理策略提供了关键见解。从业者要点：沿海湿地的平均SOC和DOC最高，表明其具有显著的碳固存潜力和养分可用性。淡水河流湿地的POC水平最高，突出了它们在颗粒有机物积累中的作用。咸水河流湿地的总碳含量很高，表明其在盐渍条件下具有恢复力。氨对SOC、DOC、MAOC和EOC有积极影响，增强了微生物活性和有机物分解。不同湿地类型碳含量的差异强调了制定针对性保护和管理策略的必要性。
