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FIRE STORM
Fires did not destroy (as fast as we thought)
by Staff Writers
Boulder CO (SPX) Jan 19, 2016


A: Key physiographical and landscape features of the Tablelands region, southeastern Australia. B: Sampling locations of bedrock outcrops (diamonds) and fluvial sediment (white circles). Base map is the World Shaded Relief coverage (Esri). See related open-access article by Portenga et al. Image courtesy Base map is the World Shaded Relief coverage (Esri). For a larger version of this image please go here.

Today, people are major agents of landscape change and catalysts for erosion, but what did people do to the environment before the industrial revolution -- before mechanized agriculture?

The impact that indigenous peoples had on their landscapes, and when, are often difficult to determine. In this article for Geology, Eric W. Portenga and colleagues show that the use of fire by native Australians had little impact on the erosion of the landscapes they inhabited.

By counting atoms of beryllium-10 in rock and stream sediment samples from Australia's southeastern Tablelands and comparing them to the total amount of beryllium-10 the team was predicted they would find, they were able to model the effect of Aboriginal burning-practices on the rate of erosion in this landscape.

Portenga and colleagues found that Aboriginal burning was not intense enough, or used for long enough, to change significantly the Tablelands' natural long-term rate of landscape erosion over the preceding thousands to millions of years.

They also concluded that Aboriginal burning started affecting natural erosion processes in the Tablelands only in the past few thousand years.

These findings show that in southeastern Australia, Aboriginal impact on the landscapes was much less and much more recent than previously thought.


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Related Links
Geological Society Of America
Forest and Wild Fires - News, Science and Technology






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Cooler temperatures and easing winds Monday helped firefighters contain a bushfire that killed two people and razed 143 properties, with clean-up efforts getting underway. The inferno, sparked by lightning six days ago, burnt through 71,000 hectares (175,000 acres) in Western Australia state, leaving a trail of destruction, the latest in a series of summer blazes that have so far left eight ... read more


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