Introduction

Gabon is often presented as one of the few countries in the world that absorbs more carbon than it emits. This remarkable capacity is usually associated with its vast tropical forests. However, along its more than 800-kilometre coastline, another ecosystem plays an essential and still little-known role: the mangrove. Quiet yet powerful, Gabon’s mangroves contribute significantly to climate regulation and the protection of coastal ecosystems.

Understanding Blue Carbon

Blue carbon refers to the carbon captured and stored by oceanic and coastal ecosystems. It mainly concerns mangroves, seagrass meadows, and salt marshes. These environments absorb carbon dioxide from the atmosphere and store it long-term in their organic-rich soils. Unlike some terrestrial ecosystems, this carbon can remain trapped for hundreds or even thousands of years.

Exceptional Carbon Storage Capacity

Mangroves are among the most efficient ecosystems in the world for carbon storage. Scientific studies show that they can store up to four times more carbon than terrestrial forests over the same surface area. This efficiency is explained by their waterlogged soils, which slow down the decomposition of organic matter and promote carbon accumulation.

The Specificity of Gabon’s Mangroves

Gabon hosts the largest mangrove forests in Africa. In some areas, particularly around the Komo estuary, mangrove trees can reach up to 60 metres in height—an exceptional size for this type of vegetation. These mangroves cover large coastal zones and represent a major blue carbon reservoir on the African continent.

An Essential Ecological Role

Beyond climate regulation, mangroves perform several important ecological functions. They act as natural barriers against coastal erosion by reducing the impact of waves and currents. They also serve as nurseries for many species of fish, crustaceans, and molluscs, thereby contributing to marine biodiversity.

Conclusion

Gabon’s mangroves illustrate the central role of coastal ecosystems in the fight against climate change. By efficiently capturing carbon and protecting shorelines, they contribute to both local and global environmental balance. A better understanding of their functioning highlights their importance for the planet and for future generations.