Tree
hideA 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
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News tagged with trees
SKorea to plant trees in China to reduce 'yellow dust'
Nov 04, 2009 |
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The Seoul city government will help fund a tree-planting project in a Chinese desert to reduce the amount of harmful "yellow dust" blowing over South Korea, officials said Wednesday.
Sun or shade: Pecan leaves' photosynthetic light response evaluated
Nov 03, 2009 |
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Pecan, the most valuable nut tree native to North America, is native from northern Illinois and southeastern Iowa to the Gulf Coast of the United States, where it grows abundantly along the Mississippi River, ...
Study of alternate bearing presents recommendations for citrus growers
Nov 02, 2009 |
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Alternate bearing (also called biennial or uneven bearing) is the tendency of fruit trees to produce a heavy crop one year (called "on-crop") followed by a light crop or no crop the following "off-crop" year. ...
Trees facilitate wildfires as a way to protect their habitat
Oct 28, 2009 |
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Fire is often thought of something that trees should be protected from, but a new study suggests that some trees may themselves contribute to the likelihood of wildfires in order to promote their own abundance ...
Scientists Cryopreserve Pest-Imperiled Ash Trees
Oct 28, 2009 |
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(PhysOrg.com) -- Using cryopreservation methods, Agricultural Research Service (ARS) scientists have devised a procedure for storing frozen budwood from ash trees (Fraxinus) and thawing the delicate buds for ...
Like a hungry teen, life on Earth had big growth spurts
Space & Earth / Earth Sciences
Oct 27, 2009 |
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Twice in the Earth's history, living creatures underwent astonishing growth spurts, and each time, new organisms emerged that were a million times larger than anything that had existed before.
Calif. citrus farmers fear tree-killing disease
Oct 08, 2009 |
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(AP) -- Tom Mulholland is girding for battle against a tiny enemy that could devastate the orange grove he has spent his life cultivating. His adversary: the Asian citrus psyllid, a fruit-fly-sized insect ...
MSU Archaeology Team's latest find: 16,000-year-old sand dune
Other Sciences / Archaeology & Fossils
Sep 21, 2009 |
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(PhysOrg.com) -- A team of MSU researchers and archaeology students has confirmed the existence of an undisturbed, prehistoric sand dune beneath a grove of pine trees between Demonstration Hall and Munn Ice ...
Purchase Carbon Offsets at the Airport
Sep 21, 2009 |
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(PhysOrg.com) -- One of the activities that puts a great deal of carbon dioxide into the environment is air travel. Air travel is one of the ways that individuals contribute to an increase in pollution and ...
'Green Clean:' Researchers Determining Natural Ways To Clean Contaminated Soil
Sep 17, 2009 |
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(PhysOrg.com) -- Researchers at North Carolina State University are working to demonstrate that trees can be used to degrade or capture fuels that leak into soil and ground water. Through a process called ...
Invasive Species on the March: Variable Rates of Spread Set Current Limits to Predictability
Sep 17, 2009 |
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(PhysOrg.com) -- Whether for introduced muskrats in Europe or oak trees in the United Kingdom, zebra mussels in United States lakes or agricultural pests around the world, scientists have tried to find new ...
As ash borer claims more trees, researcher works for species survival
Sep 10, 2009 |
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Mark Widrlechner may someday be known as the modern-day Johnny Appleseed for ash trees. As the devastating insect emerald ash borer is working its way across North America destroying almost all the native ...
Forests of Artificial Trees Could Slow Global Warming
Aug 28, 2009 |
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(PhysOrg.com) -- A new study on how technology could help to regulate climate change has studied hundreds of ideas, and selected three considered practical and able to be implemented quickly. The report's ...
Scientists announce unique acacia tree's promise to revive African soils
Aug 24, 2009 |
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Scientists said today at the 2nd World Congress of Agroforestry that a type of acacia tree with an unusual growth habit—unlike virtually all other trees—holds particular promise for farmers in Africa as a free source of nitrogen ...
New study: Farmers protecting and growing significant amount of world's trees
Aug 24, 2009 |
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Although agriculture, particularly in the developing world, is often associated with massive deforestation, scientists from the World Agroforestry Centre demonstrated today, in a study using detailed satellite imagery, that ...
