cork oak


Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.
Related to cork oak: cork tree

cork oak,

name for an evergreen species of the oak genus (Quercus) of the family Fagaceae (beechbeech,
common name for the Fagaceae, a family of trees and shrubs mainly of temperate and subtropical regions in the Northern Hemisphere. The principal genera—Castanea (chestnut and chinquapin), Fagus (beech), and Quercus
..... Click the link for more information.
 family). The cork oak (Q. suber) is native to the Mediterranean region, where most of the world's commercial supply of corkcork,
protective, waterproof outer covering of the stems and roots of woody plants. Cork is a specialized secondary tissue produced by the cork cambium of the plant (see meristem, bark).
..... Click the link for more information.
 is obtained. It is cultivated elsewhere as an ornamental and has been introduced into warmer regions of the United States because of its economic value. The bark of the tree is stripped off (about every 10 years) and then processed for shipment as commercial cork. There is a cork layer in all trees but it is not as extensive or valuable as in the cork oak. Cork oak is classified in the division MagnoliophytaMagnoliophyta
, division of the plant kingdom consisting of those organisms commonly called the flowering plants, or angiosperms. The angiosperms have leaves, stems, and roots, and vascular, or conducting, tissue (xylem and phloem).
..... Click the link for more information.
, class Magnoliopsida, order Fagales, family Fagaceae.

Cork Oak

 

two (or three) species of evergreen trees of the genus Quercus, whose trunk and thick branches become covered with corky bark by the third to fifth year of life. The cork may be removed when the tree is 15 to 20 years old. It is removed once every ten years until the tree is 200 years old. The leaves have dentate or entire margins and are gray and hairy below. The trunk reaches a height of 20 m and a diameter of about 1 m.

Quercus suber grows in the coastal region of the western Mediterranean at elevations to 400–500 m. A closely related species is Q. occidentalis, which is native to the coastal region of Portugal and is distinguished by its thin and pubescent leaves. Both species of cork oak are cultivated. In the USSR they are raised in the southern Crimea and in the Caucasus. A third species, Q. crenata (formerly Q. pseudosuber), grows in southern Europe. Apparently a hybrid of Q. cerris and Q. suber, it has a poorly developed cork layer. The species is grown as an ornamental.

REFERENCES

Pravdin, L. F. Probkovyi dub i ego razvedenie v SSSR. Moscow-Leningrad, 1949.
Derev’ia i kustarniki SSSR, vol. 2. Moscow-Leningrad, 1951.
References in periodicals archive ?
To disseminate the techniques and tools developed at a local level (forest owners, managers and cork companies) and within the EU countries concerned (Portugal, France, Italy) in order to: a) improve the management of cork oak forests in Catalonia and southern Europe; and b) raise awareness of the problems addressed and demonstrate that a sustainable economic activ
In Morocco, at the Ben Slimane cork oak forest, measurements were made at the end of the dry summer of 1999, when the soils were at their lowest soil moisture content (<3 [cm.
Cork oak trees are one of the world's most eco-friendly natural resources, providing refuge for rare and endangered species and reducing greenhouse gases --14 million metric tons of carbon dioxide is captured annually by cork oak forests in the Mediterranean.
Plastic bottle stoppers and artificial fibre carpets use up valuable oil resources in their manufacture and do nothing to maintain valuable cork oak forests.
BioShield offers Cork Flooring, which comes from cork oak trees found in the olive groves and vineyards of Spain and Portugal.
About 50 percent of the world's cork supply comes from forests in Portugal and Spain, where farmers strip the bark off cork oak trees for the wine industry.
Among the Mediterranean tree species threatened by climate change were the cork oak, holm oak, Aleppo pine, and maritime pine.
The cork oak tree in the middle of the second fairway has always been the subject of debate and so have the drives down the sloping fairway of the long 11th and dogleg 18th.
It takes a cork oak 40 years to produce quality bark, which thereafter can be stripped only every nine years.
Below that depth, soil pH was significantly lower and exchangeable Al greater under the cork oak stand than at the other 2 sites.
Cork is traditionally made from the bark of cork oak trees.