期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 777, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.145962
关键词
Mangrove; Tidal marsh; Seagrass; Sea level rise; Soil carbon; Climate change
资金
- Thomas Foundation
- HSBC Australia
- Ian Potter Foundation
- New South Wales government
- Parks Victoria
- Department of Environment, Land, Water and Planning
- New South Wales Department of Primary Industries
- Australian Research Council Linkage Project [LP160100242]
- Victorian Coastal Monitoring Program - Sustainability Accord
- Victorian coastal Catchment Management Authorities (CMAs) : Glenelg Hopkins CMA
- Victorian coastal Catchment Management Authorities (CMAs) : Corangamite CMA
- Victorian coastal Catchment Management Authorities (CMAs) : Port Phillip Westernport CMA
- Victorian coastal Catchment Management Authorities (CMAs) : West Gippsland CMA
- Victorian coastal Catchment Management Authorities (CMAs) : East Gippsland CMA
- Victorian Wales government
This study found that carbon sequestration from avoiding erosion-related emissions far exceeds sequestration from coastal restoration. The removal of levees combined with managed retreat was the strategy that sequestered the most carbon. Managed retreat scenario significantly increased carbon sequestration and reduced carbon emissions compared to baseline erosion scenario.
Restoring and protecting blue carbon ecosystems - mangrove forests, tidal marshes, and seagrass meadows are actions considered for increasing global carbon sequestration. To improve understanding of which management actions produce the greatest gains in sequestration, we used a spatially explicit model to compare carbon sequestration and its economic value over a broad spatial scale (2500 km of coastline in southeastern Australia) for four management scenarios: (1) Managed Retreat, (2) Managed Retreat Plus Levee Removal, (3) Erosion of High Risk Areas, (4) Erosion of Moderate to High Risk Areas. We found that carbon sequestration from avoiding erosion-related emissions (abatement) would far exceed sequestration from coastal restoration. If erosion were limited only to the areas with highest erosion risk, sequestration in the non-eroded area exceeded emissions by 4.2 million Mg CO2 by 2100. However, losing blue carbon ecosystems in both moderate and high erosion risk areas would result in net emissions of 23.0 million Mg CO2 by 2100. The removal of levees combined with managed retreat was the strategy that sequestered the most carbon. Across all time points, removal of levees increased sequestration by only an additional 1 to 3% compared to managed retreat alone. Compared to the baseline erosion scenario, the managed retreat scenario increased sequestration by 7.40 million Mg CO2 by 2030, 8.69 million Mg CO2 by 2050, and 16.6 million Mg CO2 by 2100. Associated economic value followed the same patterns, with large potential value loss from erosion greater than potential gains from conserving or re-storing ecosystems. This study quantifies the potential benefits of managed retreat and preventing erosion in existing blue carbon ecosystems to help meet climate change mitigation goals by reducing carbon emissions. Published by Elsevier B.V.
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