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Assessing coastal carbon variability in two Delaware tidal marshes
Journal of Coastal Conservation ( IF 2.1 ) Pub Date : 2020-10-24 , DOI: 10.1007/s11852-020-00783-3
Kari A. St. Laurent , Daniel J. Hribar , Annette J. Carlson , Calyn M. Crawford , Drexel Siok

Coastal wetlands provide numerous ecosystem services, including the ability to sequester and store carbon. Recent initiatives, such as the U.S. Climate Alliance’s National Working Lands Challenge, have sought to better understand and quantify this ‘blue carbon’ storage as a land management approach to maintain, or potentially offset, atmospheric carbon emissions. To build on this effort locally, loss on ignition and elemental analyses were used to assess sediment organic matter, dry bulk density, and carbon density variability within the root zone of a mesohaline and oligohaline tidal marsh in Delaware. Additionally, we assessed sediment carbon variability at depth greater than one meter and quantified the black carbon fraction in the mesohaline tidal marsh. Organic matter concentrations ranged between 11.85 ± 1.19% and 23.12 ± 6.15% and sediment carbon density ranged from 0.03 ± 0.01 g cm−3 to 0.06 ± 0.02 g cm−3 with both found to significantly differ between the mesohaline and oligohaline tidal marsh systems. Significant differences between dominant vegetation types were also found. We used these data to further estimate and valuate the carbon stock at the mesohaline tidal marsh to be 350 ± 310 metric tons of soil carbon accumulation per year with a social carbon value of $40,000 ± $35,000. This work improves our knowledge of Delaware-specific carbon stocks, and it may further facilitate broad estimates of carbon storage in under-sampled areas, and thereby enable better quantification of economic and natural benefits of tidal wetland systems by land managers.



中文翻译:

评估特拉华州两个潮汐湿地的沿海碳变异性

沿海湿地提供了许多生态系统服务,包括隔离和存储碳的能力。最近的举措,例如美国气候联盟的“国家工作用地挑战赛”,试图更好地理解和量化这种“蓝碳”存储,以此作为维持或潜在抵消大气中碳排放的土地管理方法。为了在此基础上继续努力,使用了燃烧损失和元素分析来评估特拉华州中盐和低盐潮沼泽根部区域内的沉积物有机物,干容重和碳密度变异性。此外,我们评估了大于一米深处的沉积物碳变异性,并量化了中卤代潮汐沼泽中的黑碳含量。有机物浓度范围为11.85±1.19%和23.12±6。-3至0.06±0.02 g cm -3,在中卤和低卤潮汐沼泽系统之间均存在显着差异。还发现主要植被类型之间存在显着差异。我们使用这些数据进一步估计和评估了中卤代潮汐湿地的碳储量为每年350±310吨土壤碳蓄积,社会碳值为$ 40,000±$ 35,000。这项工作提高了我们对特拉华州特定碳储量的了解,并且可以进一步促进对欠采样地区碳储量的广泛估计,从而使土地管理人员能够更好地量化潮汐湿地系统的经济和自然效益。

更新日期:2020-10-26
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