cork oak

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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
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 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).
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 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).
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, 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 ?
The choice of cork oak as phorophyte takes into account the importance of this species not only in the area being investigated, but in the greater (surrounding) area [63].
The project aims to implement and demonstrate new forest management techniques for European cork oak (Quercus suber) forests, in order to improve their adaptation and resilience to climate change and to enhance their prospects both for conservation and for management.
In addition, the Al-complexing ability of the water-soluble component from freshly fallen leaf litter of cork oak and radiata pine was evaluated as well as the ability of these extracts to mobilise Fe from packed soil columns.
We have recycled more than 47 million cork stoppers and have planted more than 8,000 cork oaks," says Matt Hughes, brand manager at ReCORK, North America's largest cork recycling initiative.
Cork oaks, through their unique ability to thrive in sandy and low-nutrient soils, allow for the crucial fixation of organic matter and water-retention capabilities.
Natural cork is biodegradable, recyclable and sustainable, and its use encourages the stewardship of cork oak forests that offset carbon pollution.
Cork oaks can live for hundreds of years, and there is no shortage of corks or cork oak trees.
If this trend continues, the cork oaks will be replaced by quick cash crops that provide none of the environmental advantages of cork oaks.
50sec at Limerick, and was a Cork Oaks semi-finalist.
Winner of the Cork Oaks recently, Tyrur Tinkerbell damaged a wrist on Saturday and Hennessy stated that it is serious and could well end her racing career.
Fraser Black's Cork Oaks finalist Lady Lucielle proved herself a strong stayer when taking it up before the first bend for a two-length margin over Helmet Boy in 32.
Quite apart from the English Derby Trial Stake, the card includes the semifinals of the McCarthy Insurance Group Cork Oaks, three very interesting contests.