Debanshi Sandipta, Pal Swades
Department of Geography, University of Gour Banga, India.
Department of Geography, University of Gour Banga, India.
Sci Total Environ. 2022 Feb 20;808:152133. doi: 10.1016/j.scitotenv.2021.152133. Epub 2021 Dec 2.
Present study deals with the role of wetland for regulating greenhouse gases (GHG) particularly methane (CH) emission and carbon (C) sequestration in mature Ganges deltaic environment. The annual total amount of emission and sequestration in wetlands of varying types was estimated along with the seasonal variation. Result showed that the streams were the highest emitter of CH followed by ox-bow lakes in all the seasons whereas the bheries (embanked pisciculture arresting tidal water) consistently exhibited the lowest average emission. The average sequestration of C was the highest in ox-bow lakes followed by marshes and mudflats. The average emission in monsoon season was 43% and 78% higher than the average emission of pre and post-monsoon seasons respectively. The yearly total emission was 8.01 × 10 ton and yearly total sequestration was estimated 908.98 × 10 ton. From the perspective of GHG regulation, the wetlands were found to yearly uptake four times higher carbon dioxide (CO) than the CO equivalent (COe) of emitted CH. After offsetting the fixation cost of emitted CH the yearly surplus sequestrated C in the wetlands of the entire region was worthy of 68.46 million US dollar (USD). So, wetland plays positive role for reducing greenhouse gas effect and associated temperature rise which is considered to be serious issue. Such result has made a good agreement on the debated issue of wetland CH emission and C sequestration and will encourage restoring wetland for even mediating GHG issue.
本研究探讨了湿地在恒河成熟三角洲环境中对调节温室气体（GHG），特别是甲烷（CH）排放和碳（C）固存的作用。估算了不同类型湿地的年度排放和固存总量以及季节变化情况。结果表明，在所有季节中，溪流是CH的最高排放源，其次是牛轭湖，而bheries（围堤式水产养殖拦截潮水区域）的平均排放量始终最低。C的平均固存率在牛轭湖中最高，其次是沼泽和泥滩。季风季节的平均排放量分别比季风前和季风后季节的平均排放量高43%和78%。年度总排放量为8.01×10吨，年度总固存量估计为908.98×10吨。从温室气体调节的角度来看，湿地每年吸收的二氧化碳（CO）比排放的CH的CO当量（COe）高四倍。在抵消排放CH的固定成本后，整个地区湿地每年固存的C盈余价值6846万美元。因此，湿地在减少温室气体效应和相关温度上升方面发挥着积极作用，而这被认为是一个严重问题。这一结果在湿地CH排放和C固存这一有争议的问题上达成了良好共识，并将鼓励恢复湿地以更好地解决温室气体问题。
