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Increasing precipitation extremes driving tree growth reductions across Southwest

ScienceDaily (October 2, 2019)

Titre : Increasing precipitation extremes driving tree growth reductions across Southwest

ScienceDaily (October 2, 2019)

Résumé
As the Earth’s temperature warms, its hydrological cycle kicks into overdrive - wet years get wetter, and dry years get drier. According to a new study, these increased rainfall extremes could have dire consequences for the semi-arid forests of the western U.S.
To better understand how forests may respond to changes in rainfall extremes, the authors analyzed long-term tree-ring records for more than 1,300 sites across the United States. Tree rings document yearly tree growth in response to seasonal climate changes for the full life span of the tree, providing a window into tree growth hundreds of years into the past.

Global climate models show precipitation variability will likely continue to increase in the 21st century, especially across dry forests of the western U.S. Thus, the critical question remains, what can be done to prepare for, or even prevent, the detrimental impacts of these changes ? While recent research on the need for large-scale reforestation efforts to combat climate change has received traction in the popular media, the authors stress that equal efforts must also be made to better understand and manage existing forests to prevent the degradation of their ability to store carbon.

Story Source  : University of Arizona.

Annonce (ScienceDaily)

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