Senin, 02 Maret 2009

Silver Birch

By Jenna Nevaeh

The grey alder is primarily a tree of northern Europe. In central and southern Europe it grows in the mountains, mainly in the region of the Alps and Carpathians. It attains a height of only 15 to 20 metres and has smooth grey bark even in old age, its life span being a maximum of 60 to 100 years. The flowers appear in spring about fourteen days before those of the black poplar, the cones and seeds maturing in late September. The seed is light brown with a broad, encircling wing. The grey alder has a shallow root system, and is marked not only by vigorous production of stump suckers, but also by root suckers, especially in the northern parts of its range.

It attains heights of 20 to 25 metres and develops a slim bole topped with a crown of slender, pendent branches. It has a fairly short life span, attaining an age of 100 to 200 years. The twigs are covered with waxy warts. The bark is white and smooth, becoming blackish and fissured at the base. The flowers appear in April, and the fruits mature in June, being gradually dispersed great distances by the wind until the onset of winter. This, plus the fact that the tree grows well even on poor soils, makes it an important colonist of forest clearings, pastures and fallow land. The silver birch is a light-demanding species and stands up well to both frost and the sun's heat. The white trunk and fresh green of its spring foliage make it an ornamental element in the landscape.

The beech is a slow- growing tree whose fallen leaves enrich the soil and in certain areas it is marked by abundant natural propagation by seed. The hard wood is used to make furniture, parquet flooring, sleepers and cellulose. Its ornamental forms are often planted in parks.

The Spanish chestnut is indigenous to southern Europe, Asia Minor and North Africa. As early as Roman times, however, it was introduced into more northerly regions, and later it was cultivated in monastery gardens by monks. Today, centuries old specimSns may be found in Great Britain and the whole of western and central Europe. The Spanish chestnut is often a large tree attaining a height of up to 30 metres with a trunk more than two metres in diameter. The oblong-lanceolate, boldly toothed leaves are ornamental.

A shade-loving tree, it makes moderate demands on soil fertility and moisture. It has a shallow, widespreading root system and is marked by the production of stump sprouts when cut back.

The nuts, which are very tasty, are used by confectioners and also eaten roasted. The tree requires a mild climate and adequate moisture for good growth and a good nut harvest. It is sensitive to late spring and early autumn frosts, is intolerant of lime, and under forest conditions does well even in moderate shade. The high quality, durable wood is used to make furniture, barrels, fencing and also provides tannin.

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