Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Brèves → Brèves 2016 → Restoring prairie and fighting wildfire with (drone launched) fire(balls)

Restoring prairie and fighting wildfire with (drone launched) fire(balls)

ScienceDaily (August 1, 2016)

Titre : Restoring prairie and fighting wildfire with (drone launched) fire(balls)

To restore the grasslands of the Great Plains, a Nebraska ecologist says, bring back high intensity fires

ScienceDaily (August 1, 2016)

He conducted experimental high-intensity burns in Texas at a humid subtropical site near Corpus Christi and a semi-arid site on the Edwards Plateau, about 200 miles west of Austin, during one of the most severe droughts recorded for the region. Intense fire burned through the juniper canopy. Dry soil also favored reestablishment of fire-adapted grasses post-fire, likely limiting the capacity of the shrubs to resprout from underground buds.
Further experiments in Nebraska’s Sandhills demonstrated that grass recovers quickly after extreme fire. Two years after burning, the plots had no striking bald or eroding patches and could not be distinguished from plots that had not burned.
To prevent experimental fires from running wild, Twidwell and his team calculated the maximum distance embers could jump to kindle a new fire based on ember transport models used in forest fire fighting. They created firebreaks much larger than the predicted distance, up to 450 meters (about 5 football fields) wide, downwind of their experiment. He believes his experiments could be safely replicated for conservation applications. Some ranchers with large acreages who use fire regularly and intensively are already applying the necessary principals to manage the perimeter of their land and burn the interior.
Technical innovations can lower costs and keep ground crews at a safer distance from the firefront. That’s where the drone comes in. The idea originated as joke floated over coffee with co-author Craig Allen, a researcher with the U.S. Geological Survey’s Nebraska Cooperative Fish and Wildlife Research Unit. But after laughing about it, they realized it could have real benefits.

Story Source  : Ecological Society of America

Annonce (ScienceDaily)

Page publiée le 1er mai 2017