(23 Total References)
Landscape: Views From Within - Playa
Lisa Floyd-Hanna, botanist, & David Hanna, environmental science (AZ)
Lisa Floyd-Hanna is an ecologist whose work in pinon-juniper woodlands focuses on fire history and post-fire responses to a changing climate.
Dry, hot summers, beetle infestations and invasive plants have altered the scope of the western landscape, and she
and colleagues are attempting to sort out some of the effects mediated by these changes in the Four Corners region and in Dinosaur National Park.
Lisa studied at University of Hawaii (M.S. Botany) and University of Colorado (Ph.D. Evolutionary Biology) and for the last 22 years has been a professor at Prescott College in the Environmental Studies Program.
recent publications regarding fire, grazing, beetles, and restoration include: "Revisiting Trends in Vegetation Recovery Following Protection from Grazing, Chaco Culture National Park,New Mexico" in: The Colorado Plateau V: Research, environmental planning, and management for collaborative conservation, University of Arizona Press; "Ecological Restoration Priorities and Opportunities in Piñon-Juniper Woodlands" Ecological Restoration 30 (1):37-49; "Relationship of stand characteristics to drought-induced mortality in piñon-juniper woodlands in Colorado, New Mexico and Arizona.
Ecological Applications 19(5):1223-1230.
Summit Daily News for Breckenridge, Keystone, Copper and Frisco Colorado - News
Plant scientist Lisa Floyd-Hanna of Prescott College, Prescott, Ariz., said global warming is a factor.
"While we have had droughts of this magnitude before, they have never been coupled with such high temperatures," said she
during a meeting scientists and managers."Even seemingly small changes in temperatures have had devastating effect on our vegetation."Floyd-Hanna
said temperatures, on average, were three degrees warmer during the 2002-2003 period than during the last major drought, 1953-1956.
University Press of Colorado - Ancient PiÃ±on-Juniper Woodlands - Product Details
M. Lisa Floyd is professor and chair of environmental studies at Prescott College in Arizona.
Society for Human Ecology
Lisa Floyd-Hanna - Prescott College - Arizona
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Lisa Floyd started researching piñon pine and juniper at the historic park in 1989 for her doctoral dissertation at the University of Colorado.She is now a professor at Prescott College in Arizona.Over nearly two decades, she focused on how fire and drought affect the trees.Her past conclusions have startled some, she said, and her latest are frightening.
People called her
study showing piñon and juniper stands have a 400-year cycle "the craziest thing we've ever heard," she
said, because they expected it to be much shorter.A fire cycle is defined as the time it takes for a whole area to burn, generally with several fires.
developed a simulation model that suggests the 400-year cycle may drop to a 45-year cycle that will prevent new piñon and juniper plants from growing once fire burns them.Floyd
has watched fire whittle away Mesa Verde's old growth forest, with major burns occurring in 1996, 2000, 2002 and 2003.Though many worried the frequency of the fires was the beginning of a new pattern, her
studies showed otherwise.
However, Floyd spotted an unusual aftermath: An invasive plant called cheatgrass rapidly sprouted wherever fire razed the piñon-juniper woodlands.
"It's making a march all through Colorado," Floyd
described cheatgrass as a fine fuel that lights and spreads easily, fanning fires.That's a problem, she
said, because it increases the likelihood of fires and gives piñon pine and juniper less opportunity to regrow after a fire.
did point out that her
predictions were a model, not a fact.
"It's a good tool, but it can be wrong," she