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首页> 外文期刊>Ocean & coastal management >Challenges to select suitable habitats and demonstrate 'additionally' in Blue Carbon projects: A seagrass case study
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Challenges to select suitable habitats and demonstrate 'additionally' in Blue Carbon projects: A seagrass case study

机译：在蓝碳项目中选择合适的栖息地并证明“另外”的挑战：海草案例研究

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摘要

Seagrass restoration has been suggested as a Blue Carbon (BC) strategy for climate change mitigation. For Nationally Determined Contributions (NDC) and carbon crediting schemes, BC projects need to demonstrate 'additionality', that is enhanced CO2 sequestration and/or avoided greenhouse gas emissions following management actions. This typically requires determining soil carbon accumulation rates (CAR), which is often done using radionuclides or surface elevation tables to estimate sedimentation rates. Here we undertook a case study, using Pb-210 and C-14 dating, to detect possible changes in C-org stocks and CAR following the loss and partial recovery of Posidonia seagrass meadows in South Australia since 1980-90s. The Pb-210 data revealed a lack of accumulation of excess Pb-210 in most sites, suggesting negligible accumulation of sediments, intense mixing of the upper layers, or accumulation of reworked sediments, precluding the estimation of reliable CAR at decadal time scales. This limitation was also encountered with C-14. The inability to compare sites over analogous periods of time prevented quantifying differences in soil C org sequestration, thereby to demonstrate additionality. The lack of significant differences in soil C org stocks among sites which never suffered seagrass loss, those showing recovery and those with no recovery (5.7 +/- 1.2, 4.5 +/- 0.7 and 3.3 +/- 0.3 kg C-org, m(-)(2) within the top meter, respectively) also precluded estimates of soil C org gains or losses. Our findings demonstrate that, while Pb-210 and C-14 provide important information on sediment deposition dynamics, it is not straightforward to demonstrate additionality using radionuclides in low depositional seagrass habitats exposed to hydrodynamic energy, features which may be encountered in seagrass sites. We provide insights for the selection of suitable habitats for seagrass BC projects, suggest possible alternative methods for estimating additionality, and discuss the implications of the findings for the implementation of seagrass BC strategies to mitigate greenhouse gas emissions.
机译：已经提出了海草恢复作为气候变化缓解的蓝碳（BC）策略。对于国家决定的捐款（NDC）和碳贷款计划，BC项目需要证明“额外性”，这是增强的CO2封存和/或避免了管理行动后的温室气体排放。这通常需要确定土壤碳积累速率（汽车），其通常使用放射性核素或表面仰卧表来估计沉降率。在这里，我们进行了一个案例研究，使用PB-210和C-14约会，从1980-90年代以来，南澳大利亚的Posidonia Seagrass Meadows的损失和部分恢复，检测C-Org股票和汽车的可能变化。 PB-210数据显示在大多数地点中缺乏PB-210的积累，表明沉积物的积累，上层的强烈混合或再加工沉积物的积累，排除在截止数量尺度的可靠轿厢的估计。 C-14还遇到了这种限制。无法比较基本时期的网站，防止量化土壤C组序列的差异，从而证明了额外性。从未遭受海草损失的地点的土壤c组织股缺乏显着差异，恢复的遗址和没有恢复的人（5.7 +/- 1.2,4.5 +/- 0.7和3.3 +/- 0.3千克C-Org，m （ - ）（2）分别在顶部米内）还排除了土壤C组织的估计或损失。我们的研究结果表明，虽然PB-210和C-14提供有关沉积物沉积动力学的重要信息，但在暴露于流体动力能量的低沉积海草栖息地中，使用放射性核素的额外性并不简单，可以在海草位点遇到的特征。我们为选择合适的海草项目栖息地提供了洞察力，建议估算额外性的可能替代方法，并讨论了对海草BC策略实施以缓解温室气体排放的影响。

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  • 来源
    《Ocean & coastal management》 |2020年第11期|105295.1-105295.8|共8页
  • 作者

    Lafratta A.; Serrano O.; Masque P.; Mateo M. A.; Fernandes M.; Gaylard S.; Lavery P. S.;

  • 作者单位

    Edith Cowan Univ Sch Sci 270 Joondalup Dr Joondalup WA 6027 Australia|Edith Cowan Univ Ctr Marine Ecosyst Res 270 Joondalup Dr Joondalup WA 6027 Australia;

    Edith Cowan Univ Sch Sci 270 Joondalup Dr Joondalup WA 6027 Australia|Edith Cowan Univ Ctr Marine Ecosyst Res 270 Joondalup Dr Joondalup WA 6027 Australia;

    Edith Cowan Univ Sch Sci 270 Joondalup Dr Joondalup WA 6027 Australia|Edith Cowan Univ Ctr Marine Ecosyst Res 270 Joondalup Dr Joondalup WA 6027 Australia|IAEA 4a Quai Antoine 1er MC-98000 Principality Of Monaco Monaco|Univ Autonoma Barcelona Dept Fis Bellaterra 08193 Spain|Univ Autonoma Barcelona Inst Ciencia & Tecnol Ambientals Bellaterra 08193 Spain;

    Edith Cowan Univ Sch Sci 270 Joondalup Dr Joondalup WA 6027 Australia|Edith Cowan Univ Ctr Marine Ecosyst Res 270 Joondalup Dr Joondalup WA 6027 Australia|CSIC Ctr Estudios Avanzados Blanes Blanes 17300 Spain;

    South Australian Water Corp SA Water GPO Box 1751 Adelaide SA 5001 Australia|Flinders Univ S Australia Coll Sci & Engn GPO Box 2100 Adelaide SA 5001 Australia;

    South Australian Environm Protect Author GPO Box 2607 Adelaide SA 5001 Australia;

    Edith Cowan Univ Sch Sci 270 Joondalup Dr Joondalup WA 6027 Australia|Edith Cowan Univ Ctr Marine Ecosyst Res 270 Joondalup Dr Joondalup WA 6027 Australia;

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  • 正文语种 eng
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  • 关键词

    Blue carbon; Pb-210; Radiocarbon; Carbon accumulation rates; Posidonia; South Australia;

    机译：蓝碳;PB-210;radiocarbon;碳积累率;波塞尼亚;南澳大利亚;

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