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December 21, 2015

When trees die, water slows

University of Utah and iUTAH researcher Paul Brooks was recently featured in the news. Mountain pine beetle populations have exploded over the past decade due to warmer temperatures and drier summers, and these insects have infected and killed thousands of acres of western pine forests. Researchers have predicted that as trees died, streamflow would increase because fewer trees would take up water through their roots.

 

A recent study by University of Utah geology and geophysics professor Paul Brooks and his colleagues in Arizona, Colorado and Idaho, found that if too many trees die, compensatory processes kick in and may actually reduce water availability. When large areas of trees die, the forest floor becomes sunnier, warmer and windier, which causes winter snow and summer rain to evaporate rather than slowly recharging groundwater.

 

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Researchers ski past dying trees. Credit: Provided by Paul Brooks

 

 

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