News tagged with national forest
Study characterizes 300-million-year-old tropical forest preserved in volcano ash
(PhysOrg.com) -- Pompeii-like, a 300-million-year-old tropical forest was preserved in ash when a volcano erupted in what is today northern China. A new study by University of Pennsylvania paleobotanist Hermann ...
Space & Earth / Earth Sciences
Feb 20, 2012 |
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Carbon emissions from peat-swamp forest clearing quantified
(PhysOrg.com) -- Peat-swamp forests in Southeast Asia are being cleared to make way for food production and for oil-palm plantations for biofuel, but now a new study has quantified the resultant carbon emissions ...
Mar 08, 2011 |
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Giant Sequoias Yield Longest Fire History from Tree Rings
(PhysOrg.com) -- California's western Sierra Nevada had more frequent fires between 800 and 1300 than at any time in the past 3,000 years, according to a new study led by Thomas W. Swetnam, director of UA's ...
Mar 17, 2010 |
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Biologist solves mystery of tropical grasses' origin
Around 30 to 40 million years ago, grasses on Earth underwent an epic evolutionary upheaval. An assemblage capitalized on falling levels of atmospheric carbon dioxide by engineering an internal mechanism to concentrate the ...
Feb 08, 2010 |
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Wolves, moose and biodiversity: An unexpected connection
Moose eat plants; wolves kill moose. What difference does this classic predator-prey interaction make to biodiversity?
Nov 02, 2009 |
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Handful of heavyweight trees per acre are forest champs
Big trees three or more feet in diameter accounted for nearly half the biomass measured at a Yosemite National Park site, yet represented only one percent of the trees growing there.
May 02, 2012 |
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The case of the dying aspens
Over the past 10 years, the death of forest trees due to drought and increased temperatures has been documented on all continents except Antarctica. This can in turn drive global warming by reducing the amount of carbon dioxide ...
Dec 12, 2011 |
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Forest structure, services and biodiversity may be lost even as form remains
A forest may look like a forest, have many of the same trees that used to live there, but still lose the ecological, economic or cultural values that once made it what it was, researchers suggest this week in articles in ...
Oct 03, 2011 |
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New NASA map reveals patterns of tropical forest carbon storage
A NASA-led research team has used a variety of NASA satellite data to create the most precise map ever produced depicting the amount and location of carbon stored in Earth's tropical forests. The data are ...
May 31, 2011 |
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Declining nitrogen availability reduces CO2 fertilization effects
Climate models that project future atmospheric carbon dioxide concentrations should include a coupled nitrogen cycle, a team of researchers led by Oak Ridge National Laboratory has concluded.
Nov 16, 2010 |
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Sharks and wolves: Predator, prey interactions similar on land and in oceans
There may be many similarities between the importance of large predators in marine and terrestrial environments, researchers concluded in a recent study, which examined the interactions between wolves and ...
Nov 10, 2010 |
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Saving tropical forests: Value their carbon and improve farming technology
(PhysOrg.com) -- In a warming 21st century, tropical forests will be at risk from a variety of threats, especially the conversion to cropland to sustain a growing population. A new report this week in the ...
Oct 04, 2010 |
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Satellites reveal surprising connection between beetle attacks, wildfire
If your summer travels have taken you across the Rocky Mountains, you've probably seen large swaths of reddish trees dotting otherwise green forests. While it may look like autumn has come early to the mountains, ...
Sep 08, 2010 |
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Most new farmland comes from cutting tropical forest: researcher
(PhysOrg.com) -- A new study led by a Stanford researcher shows that more than 80 percent of the new farmland created in the tropics between 1980 and 2000 came from felling forests, which sends carbon into ...
Sep 03, 2010 |
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New study examines effects of drought in the Amazon
Recent research surrounding the impact of drought in the Amazon has provided contradictory findings as to how tropical forests react to a drier and warmer climate. A new study published in the August 2 Early Edition of the ...
Aug 02, 2010 |
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