Mankind Created a "Rainforest Crisis" in Central Africa 2,600 Years Ago
High volumes of precipitation in the region (over 3,000 mm annually) have ensured that the lake has not dried out over the millenia. This heavy rainfall has created large volumes of sediment, which are then washed into the lake. These circumstances make it possible to perform sediment analyses with the utmost precision.
Credit: B. Brademann / GFZ
This floating platform can be completely taken apart and transported overseas. The platform enabled the collection of sediment samples in the approximately 100-meter-deep Lake Barombi, which were then analyzed in the laboratory.
Credit: Y. Garcin / University of Potsdam
“We are therefore convinced that it was not climate change that caused the rainforest crisis 2,600 years ago, but it was the growing populations that settled in the region and needed to clear the forest for exploiting arable land,” says Garcin. “We are currently observing a similar process underway in many parts of Africa, South America, and Asia.” But the work of Garcin and his team also shows that nature has powerful regenerative abilities. When anthropogenic pressure decreased 2,000 years ago forest ecosystems reconstituted, but not necessarily as before: as in the Amazonian rainforest, field studies show that the presence of certain species is very often related to past human activity.
Contacts and sources:
GFZ German Research Centre for Geosciences
Source: http://www.ineffableisland.com/2018/02/mankind-created-rainforest-crisis-in.html
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