Across the central Congo Basin lies a bastion of carbon that scientists are just beginning to understand. First mapped only about a decade ago, the Cuvette Centrale peatlands are the size of England and hold some 30 billion metric tons of carbon. Over thousands of years, the swampy conditions in this part of Central Africa have slowed the decay of plant matter falling from the forest above. The process leads to the development of peat, and the peatlands in the Congo Basin are the largest known repository in the tropics. Across the millennia, enormous amounts of carbon have built up and been stashed away inside the peat. Recent research now suggests that some of that very old carbon may be returning to the atmosphere through lakes that form amid peatlands — similar to the way smoke escapes a fireplace through a chimney, according to the authors. It’s a finding that opens new questions about how we account for the cycling of carbon through these ecosystems and the resulting influence on climate change. Water draining forested landscapes meets water draining savanna landscapes at this confluence between the Fimi and Kasaï rivers in the Democratic Republic of Congo. The reddish color of the Kasaï River originates from the iron oxides associated with clays of suspended sediments transported by the river, which are more predominant in savanna compared to forest. The much darker color of the Fimi River, which drains Lake Mai Ndombe, stems from organic materials that leach from leaves and soils…This article was originally published on Mongabay

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