突尼斯沿海沉积物中的蓝碳库存:第一次评估和对生态系统保护和气候变化减缓的影响
Walid Oueslati1, Asma Jlassi1, Haifa Ben Mna1
1Laboratoire des Ressources Minérales et Environnement, Département de Géologie, Faculté des Sciences de Tunis, Université de Tunis-El Manar, Tunisia.
Marine pollution bulletin
|April 4, 2025
概括
突尼斯的沿海沉积物具有显著的碳捕获潜力,特别是海草草地,可以抵消超过100%的国家二氧化碳排放. 由于有机物质降解,一些湖显示出有限的封存.
科学领域:
- 海洋地质 海洋地质学
- 生物地质化学生物地质化学
- 气候变化科学 气候变化科学
背景情况:
- 沿海海洋沉积物在全球碳循环中发挥着至关重要的作用.
- 了解这些环境中的碳捕获对于减缓气候变化战略至关重要.
- 突尼斯广的海岸线拥有多样化的生态系统,具有不同的碳储存能力.
研究的目的:
- 进行第一个关于突尼斯沿海海洋沉积物中最终碳捕集的综合性研究.
- 评估这些沉积物在减轻二氧化碳 (CO2) 排放和气候变化方面的潜力.
- 为了比较不同突尼斯沿海生态系统的碳捕获率.
主要方法:
- 来自32个沉积物核心的碳数据的编制.
- 在八个不同的生态系统中采样:湖,Ichkeul湖,海草草地 (Posidonia oceanica) 和海湾.
- 对碳捕捉率 (gC m-2 yr-1) 和沉积率的分析.
主要成果:
- 碳捕集率有很大的差异,从2.1到177.6千克米2年-1.1.
- 波西多尼亚海洋的草地呈现出高沉积率但低沉积率 (40%),而湖则呈现出有限的沉积率.
- 伊切库尔湖作为一个重要的碳陷 (高达49 gC m-2 yr-1),突尼斯和加布斯湾显示高水平 (>40%).
结论:
- 突尼斯的沿海沉积物约扣留1243KtCO2年−1,约占突尼斯2021年二氧化碳排放量的4%.
- 海草草原具有相当大的短期和中期封存潜力,可能超过国家排放量的100%.
- 生态系统特定的管理至关重要,因为湖表现出反抗性,而海草草地和海湾则提供了显著的缓解机会.
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