在世界上最大的海草草地草地上,损失和恢复场景下的碳动态
Monica M Moritsch1, Austin J Gallagher2, S David Harris2
1Beneath The Waves, 3 Austin St., PO Box 290036, Boston, MA, 02129, USA. monica@beneaththewaves.org.
Scientific reports
|May 16, 2025
概括
海草草地储存了大量的碳,但它们的衰退威胁到这种能力. 恢复巴哈马海草可以显著提高碳捕获,帮助国家气候目标和全球生物多样性目标.
科学领域:
- 海洋生态海洋生态学
- 气候变化科学 气候变化科学
- 碳封存是一种碳封存技术.
背景情况:
- 海草沉积物是关键的碳汇,积累了大量的有机碳.
- 全球海草面积由于人为压力而减少,影响碳储存.
- 越来越多的人对为国家气候缓解战略量化海草碳积累越来越感兴趣,例如国家确定的贡献 (NDC).
研究的目的:
- 为了估计巴哈马银行海草草原100年来沉积物有机碳 (SOC) 的积累.
- 在两个场景下建模SOC积累:按常规运作 (BAU) 带有年度面积损失和恢复到历史范围.
- 评估海草恢复对巴哈马气候缓解目标的潜在贡献.
主要方法:
- 使用InVEST沿海蓝碳模型进行SOC积累估计.
- 包含海草地图和沉积物核心数据用于模型校准.
- 模拟了两种未来情景:每年1%的海草面积损失 (BAU) 和到2120年恢复30年前的海草面积.
主要成果:
- 在BAU下,到2120年,SOC积累在90.6至155.4万二氧化碳等值之间. (24.041.2 Mt CO2等于二氧化碳. 这是土著的).
- 在恢复过程中,到2120年,SOC的积累量在703.7至1058.2万二氧化碳等值之间. (186.5280.4 百万二氧化碳等值. 这是土著的).
- 恢复场景显示,SOC的积累显著增加,额外的碳相当于巴哈马的年度温室气体排放量.
结论:
- 巴哈马海草草地面临的不确定性是,由于潜在的范围下降,它们未来作为碳汇的作用不确定.
- 海草恢复为增强巴哈马的碳捕获提供了巨大的机会.
- 恢复工作可以为巴哈马的NDC和整体气候缓解战略做出重大贡献.
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