News tagged with trees
New report examines effects of trees killed by bark beetles on wildfire
A recent report analyzing a range of published studies on the impact of bark beetles on trees in the U.S. and Canada provides a more complete picture of the effect of this destructive insect on wildfires.
May 30, 2012 |
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Beetle-infested pine trees contribute more to air pollution and haze in forests
The hordes of bark beetles that have bored their way through more than 6 billion trees in the western U.S. and British Columbia since the 1990s do more than damage and kill stately pine, spruce and other trees. ...
May 23, 2012 |
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American Express plants money trees in "Farmville"
American Express on Tuesday began letting lovers of Zynga games plant money trees on "Farmville" acreage.
May 22, 2012 |
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Researchers aim to assemble the tree of life for all 2 million named species
A new initiative aims to build a grand tree of life that brings together everything scientists know about how all living things are related, from the tiniest bacteria to the tallest tree.
May 21, 2012 |
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Research team claims to have found evidence Lake Cheko is impact crater for Tunguska Event
(Phys.org) -- Early on the morning of June 30th, 1908, a huge explosion occurred in a remote part of Siberia near the Podkamennaya Tunguska River. So great was the blast that trees were knocked down in neat ...
Space & Earth / Earth Sciences
May 21, 2012 |
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Forest diversity from Canada to the sub-tropics influenced by family proximity
How species diversity is maintained is a fundamental question in biology. In a new study, a team of Indiana University biologists has shown for the first time that diversity is influenced on a spatial scale ...
May 17, 2012 |
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Millennium-old olive trees of the Iberian Peninsula are younger than expected
Northeast Spain is home to olive trees so old that they are known as "millennium-old." A group of scientists have now studied their age. The oldest is to be found in the Catalan region of Montsia and is 627 ...
May 16, 2012 |
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Study shows trees absorb less carbon than earlier thought; leaf activity drops during summer
(Phys.org) -- On the first day of summer – the longest day of the year – tree leaves are lush and green, luminous in the June sunlight.
May 15, 2012 |
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Beetle-fungus disease threatens crops and landscape trees in Southern California
(Phys.org) -- A plant pathologist at the University of California, Riverside has identified a fungus that has been linked to the branch dieback and general decline of several backyard avocado and landscape ...
May 08, 2012 |
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Fringe trees are finding new homes in urban landscapes
It's a little tree with big personality - fringe tree, or Chionanthus virginicus.
May 04, 2012 |
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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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New avocado rootstocks are high-performing and disease-tolerant
Avocado, a significant fruit crop grown in many tropical and subtropical parts of the world, is threatened by Phytophthora root rot (PRR), a disease that has already eliminated commercial avocado production ...
Apr 27, 2012 |
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Scientists find 'man's remotest relative' in lake sludge
After two decades of examining a microscopic algae-eater that lives in a lake in Norway, scientists on Thursday declared it to be one of the world's oldest living organisms and man's remotest relative.
Apr 26, 2012 |
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Trees help you breathe more easily
Research by the University of Birmingham has contributed to The Woodland Trust's new Urban Air Quality report. Published in collaboration with Lancaster University, the report highlights how considered planting of trees and ...
Apr 26, 2012 |
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Do urban 'heat islands' hint at trees of future?
City streets can be mean, but somewhere near Brooklyn, a tree grows far better than its country cousins, due to chronically elevated city heat levels, says a new study. The study, just published in the journal ...
Apr 24, 2012 |
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Tree
A tree is a perennial woody plant. It is most often defined as a woody plant that has many secondary branches supported clear of the ground on a single main stem or trunk with clear apical dominance. A minimum height specification at maturity is cited by some authors, varying from 3 m to 6 m; some authors set a minimum of 10 cm trunk diameter (30 cm girth). Woody plants that do not meet these definitions by having multiple stems and/or small size, are called shrubs. Compared with most other plants, trees are long-lived, some reaching several thousand years old and growing to up to 115 m (379 ft) high.
Trees are an important component of the natural landscape because of their prevention of erosion and the provision of a weather-sheltered ecosystem in and under their foliage. Trees also play an important role in producing oxygen and reducing carbon dioxide in the atmosphere, as well as moderating ground temperatures. They are also elements in landscaping and agriculture, both for their aesthetic appeal and their orchard crops (such as apples). Wood from trees is a building material, as well as a primary energy source in many developing countries. Trees also play a role in many of the world's mythologies (see trees in mythology).
For more information about Tree, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
