news - Heat and Drought Kills Trees in Southwest

news - Heat and Drought Kills Trees in Southwest

news - Heat and Drought Kills Trees in Southwest
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Heat and Drought Kills Trees in Southwest
Study sheds light on how quickly vegetation may
respond to climate change
/noticias.info/ According to newly published
research, a massive die off of pinyon trees
throughout the Southwest was caused by
higher atmospheric temperatures combined
with drought and lowered pest resistance.
fotos
While the trees ultimately succumbed to
infestations of bark beetles, "it was the
drought," said research team leader David
Breshears, a biologist at the University of
10/12/2005 10:27 AM
news - Heat and Drought Kills Trees in Southwest
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Arizona. "Beetles don't get trees unless the
trees are really water-stressed" and unable
to make enough pinesap to defend
themselves against the insects, he said.
http://www.noticias.info/asp/aspComunicados.asp?nid=107739&src=0
These photos show the massive die-off of pinyon pines that occurred during a recent
drought.
Breshears, Neil Cobb, director of the
Merriam-Powell Center for Environmental
Research at Northern Arizona University in
Flagstaff, Paul Rich, research scientist at
Los Alamos National Laboratory (LANL) in
N.M. and their colleagues reported their
findings this week in the online Early
Edition of the Proceedings of the National
Academy of Sciences.
In 1987, researchers established a study
site in the pinyon-juniper woodland zone at
LANL in northern N.M. They measured
moisture and temperature of the location
and used satellites to determine the extent
of tree cover, according to Alan Tessier,
program director in the National Science
Foundation's division of environmental
biology, which co-funded the research with
several federal agencies.
© D. Allen, U.S. Geological Survey
The region's 60,000 square miles (about
155,000 square km) of pinyon-juniper
woodlands became a lot less green starting
in 2002, the team found. By the end of
2003, more than 90 percent of the pinyons
in the study plot were dead.
Breshears says such higher temperatures
and drought are of the type predicted by
climate-change models.
The National Science Foundation (NSF), Los
Alamos National Laboratory (LANL), the
U.S. Forest Service, the U.S. Geological
Survey, NASA and the National Institutes of
Health funded the research.
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