当前位置: X-MOL 学术Estuar. Coastal Shelf Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Vulnerability to sea-level rise and the potential for restoration to enhance blue carbon storage in salt marshes of an urban estuary
Estuarine, Coastal and Shelf Science ( IF 2.8 ) Pub Date : 2021-07-08 , DOI: 10.1016/j.ecss.2021.107495
J.L. Raw 1, 2 , J.B. Adams 1, 2 , T.G. Bornman 2, 3 , T. Riddin 1, 2 , M.A. Vanderklift 4
Affiliation  

Coastal wetlands are vulnerable to sea-level rise (SLR) but are also valued for their potential to provide effective nature-based solutions to climate change mitigation and adaptation. Ecological benefits from these ecosystems can be constrained under urban settings by anthropogenic disturbances and pressures, so restoration activities are promoted as a management approach. Here we report on the potential for restoration of disused commercial salt extraction pans to enhance carbon (C) sequestration in the urban Swartkops Estuary, South Africa. We also considered the impact of SLR to 2100 on the distribution of estuarine habitats, the vulnerability of built infrastructure to tidal flooding, and how C sequestration is projected to change over time using the Sea-Level Affecting Marshes Model (SLAMM). Potential restoration of all salt pans (320 ha) to estuarine habitat was estimated to result in a gain of 67 850 Mg C. Establishing tidal connectivity was investigated as a potential restoration action, but most of the salt pan area was above the elevation of the current tidal range and would require excavation. Although conversion of the salt pans to estuarine habitat was predicted to occur without intervention under SLR, 44% of the original area would remain unchanged. Restoring hydrological connectivity to the estuary for these salt pans would significantly increase the extent of transitional/floodplain marsh, even under SLR to 2100. C sequestration was predicted to be 15% higher (54 614.8 Mg C) by 2100 if the salt pans could be restored, compared to if no action is taken. Overall, restoration of the salt pans has the potential to enhance C sequestration, but SLR will still cause large losses of supratidal marsh due to ‘coastal squeeze’ and extensive tidal flooding of developed areas by 2100 in the lower reaches of the estuary. A full-scale restoration approach for the Swartkops Estuary could use C sequestration potential to fund the project through carbon offsetting if the revenue exceeds the cost of the restoration activities, but additional social and ecological goals also need to be incorporated if the outcome is to be holistic and beneficial.



中文翻译:

海平面上升的脆弱性和恢复以增强城市河口盐沼中蓝碳储存的潜力

沿海湿地容易受到海平面上升 (SLR) 的影响,但也因其为减缓和适应气候变化提供基于自然的有效解决方案的潜力而受到重视。在城市环境中,人为干扰和压力可能会限制这些生态系统的生态效益,因此将恢复活动作为一种管理方法加以推广。在这里,我们报告了修复废弃的商业盐提取盘以增强南非斯沃特科普斯河口的碳 (C) 封存的潜力。我们还考虑了 SLR 到 2100 年对河口栖息地分布的影响、已建成基础设施对潮汐洪水的脆弱性,以及使用海平面影响沼泽模型 (SLAMM) 预测碳封存如何随时间变化。将所有盐田(320 公顷)恢复到河口栖息地的潜力估计会增加 67 850 Mg C。建立潮汐连通性被作为潜在的恢复行动进行了调查,但大部分盐田区域都高于河口的海拔当前的潮汐范围,需要挖掘。尽管预计在 SLR 下没有干预的情况下盐田会转变为河口栖息地,但 44% 的原始面积将保持不变。恢复这些盐田与河口的水文连通性将显着增加过渡/泛滥平原沼泽的范围,即使在 SLR 到 2100 年也是如此。如果盐田可以,预计到 2100 年 C 固存量将增加 15%(54 614.8 Mg C)恢复,与不采取任何行动相比。全面的,盐田的恢复有可能加强碳封存,但到 2100 年,由于“沿海挤压”和河口下游发达地区的大规模潮汐洪水,SLR 仍将导致潮上沼泽的大量损失。如果收入超过恢复活动的成本,Swartkops 河口的全面恢复方法可以利用碳封存潜力为项目提供资金,如果收入超过恢复活动的成本,但如果要取得成果,还需要纳入额外的社会和生态目标整体性和有益性。

更新日期:2021-07-15
down
wechat
bug