Abstract
Land degradation is a problem which affects large areas of land and the ecological services provided by coastal wetlands. Coastal ecosystems offer significant benefits for humans and the environment, including services like coastal blue carbon sequestration (CBCS), the economic value of which merits further study. The aim of this paper is to estimate the economic value of coastal blue carbon in Moulay Bousselham lagoon (MBL), Morocco, by analysing the changes in carbon storage that have taken place over 49 years in response to changes in land use and cover (LULC). To achieve this, high resolution orthophotos were used to map LULC changes and investigate the flow of cumulative LULC transformation in the MBL over the period 1971-2020. InVEST was then used to model the quantity and economic value of the CBCS service provided by coastal ecosystems. The results indicate that there were 94 types of LULC transformation over the period 1971-2020, most of them involving the conversion of wet lawn and juncus meadow into cultivated land and the extension of non-wetland areas, especially coastal dunes and built-up areas, at the expense of wetland habitats. These conversions have to some extent affected the capacity of coastal habitats to sequester and store CO2, which reached 1.47 Mt C of CBCS in 2020. In addition, the monetary value of CBCS was subject to gains of between US$ 371,053 and 3,803,295 per year, and losses of between US$ 10,127 and 103,806 per year, according to recent estimates by the European Emission Allowances (EUA) social cost of carbon (SCC) and CO2. This study reveals that revenues from CBCS service can accelerate the implementation of wetland rehabilitation strategies, which have a positive impact on climate regulation.
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The authors gratefully acknowledge the contributions of Marinus L. Otte (Editor-in-chief, Wetlands) and two anonymous reviewers for their scientific suggestions and constructive comments. The authors thank Catherine Enwright who kindly corrected and improved the English of the manuscript. We also acknowledge the support of the National Agency of Land Conservation of the Cadastre and Cartography.
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All authors contributed to the study conception. HAK, YB, MeM, YK and SE were responsible for preparation of materials, data collection and analysis. HAK, HR, MM and MeM verified the analytical methods. HAK wrote the first draft of the manuscript and all authors commented on previous versions of it. All authors discussed the results and approved the final manuscript.
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Kacem, H.A., Bouroubi, Y., Khomalli, Y. et al. The Economic Benefit of Coastal Blue Carbon Stocks in a Moroccan Lagoon Ecosystem: a Case Study at Moulay Bousselham Lagoon. Wetlands 42, 17 (2022). https://doi.org/10.1007/s13157-022-01533-x
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DOI: https://doi.org/10.1007/s13157-022-01533-x