26 Jun 2012:
Forests in Southwest U.S.
Fail to Regenerate After Fires, Study Says
Mountain forests scorched by wildfires in the southwestern U.S. in recent years have failed to regenerate as forest ecosystems because of rising temperatures, decreased precipitation, and human intervention, according to a U.S. researcher
. Speaking at an environmental conference this week in Colorado, Craig Allen, a research ecologist with the U.S. Geological Survey, described how since the mid-1990s the Southwest’s alpine forests have increasingly been replaced by grasslands and shrublands following fires, The New York Times
reports. While southwestern fires in the distant past typically remained close to the forest floor — a natural cycle that prevented the overcrowding of trees — a combination of cattle devouring grassy surface vegetation, new government policies to prevent fires, and a drier climate have significantly altered this ecosystem. As a result, Allen said, forest fires now climb to the top of the canopy and the species that live in mountainous areas — including ponderosa pines and juniper — cannot regenerate as temperatures climb and precipitation decreases. “These forests did not evolve with this type of fire,” Allen said.
Yale Environment 360 is
a publication of the
Yale School of Forestry
& Environmental Studies
Yale Environment 360
articles are now available in Spanish and Portuguese on Universia
, the online educational network. Visit the site.
Business & Innovation
Policy & Politics
Pollution & Health
Science & Technology
Antarctica and the Arctic
Central & South America
Photographer Robert Wintner documents the exquisite beauty and biodiversity of Cuba’s unspoiled coral reefs. View the gallery.
is now available for mobile devices at e360.yale.edu/mobile
The Warriors of Qiugang
, a Yale Environment 360
video, chronicles a Chinese village’s fight against a polluting chemical plant. It was nominated for a 2011 Academy Award for Best Documentary Short.
Watch the video.
Top Image: aerial view of Iceland
. © Google & TerraMetrics.
A three-part series Tainted Harvest
looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup. Read the series.