Rosentreter Judith A, Maher Damien T, Erler Dirk V, Murray Rachel H, Eyre Bradley D
Centre for Coastal Biogeochemistry, School of Environment, Science and Engineering, Southern Cross University, Lismore, New South Wales 2480, Australia.
Southern Cross Geoscience, Southern Cross University, Lismore, New South Wales 2480, Australia.
Sci Adv. 2018 Jun 13;4(6):eaao4985. doi: 10.1126/sciadv.aao4985. eCollection 2018 Jun.
Organic matter burial in mangrove forests results in the removal and long-term storage of atmospheric CO, so-called "blue carbon." However, some of this organic matter is metabolized and returned to the atmosphere as CH. Because CH has a higher global warming potential than the CO fixed in the organic matter, it can offset the CO removed via carbon burial. We provide the first estimate of the global magnitude of this offset. Our results show that high CH evasion rates have the potential to partially offset blue carbon burial rates in mangrove sediments on average by 20% (sensitivity analysis offset range, 18 to 22%) using the 20-year global warming potential. Hence, mangrove sediment and water CH emissions should be accounted for in future blue carbon assessments.
红树林中的有机物质埋藏导致大气中二氧化碳的去除和长期储存，即所谓的“蓝碳”。然而，其中一些有机物质会被代谢并以甲烷的形式返回大气。由于甲烷的全球变暖潜能值高于固定在有机物质中的二氧化碳，它可以抵消通过碳埋藏去除的二氧化碳。我们首次估算了这种抵消的全球规模。我们的结果表明，使用20年全球变暖潜能值，高甲烷逸出率有可能平均部分抵消红树林沉积物中蓝碳埋藏率的20%（敏感性分析抵消范围为18%至22%）。因此，在未来的蓝碳评估中应考虑红树林沉积物和水体的甲烷排放。
