Indigenous Australians have been managing the environment with fire for at least 11,000 years, according to an analysis of sediment cores retrieved from an ancient lake.at James Cook University in Cairns, Australia, says the findings suggest that a return to an Indigenous regime of more frequent but less intense fires could reduce the risk of catastrophic bushfires and improve environmental management.
However, it has been difficult to establish how long this has been happening for, says Bird. That is because most waterways completely dry out in the dry season each year and the carbon in their sediments is destroyed. The first two metrics allow researchers to infer the intensity of fires, while the third indicates whether fires were cool enough to leave traces of grasses preserved.
Indigenous fire regimes, on the other hand, burn frequently but with much less heat, affect small areas and are limited to the ground layer, promoting a mosaic of vegetation and helping to protect biodiversity.
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