Selasa, 03 Maret 2009

Common Oak and Durmast Oak

By Lauren Elizabeth

The red oak is a native of North America, where it grows in mixed stands, with other broad-leaved woody plants, from the 35th parallel northward to Canada. It is a robust tree, reaching a height of 35 metres. When grown in the open, it develops a broad cro,A1 with strong branches. The bark remains smooth and grey-green until an advanced age. The lobed leaves turn dark red in autumn, hence its name. The acorns mature in the autumn of the second year. They are not as popular a food with forest animals as other acorns, because of the sharp point at their tip.

The red oak grows faster than European oaks when young, and gives greater yields of timber per hectare. It has more moderate requirements as to soil conditions and grows well on acid soils, but should not be planted in water-logged soils.

Because of its characteristics, it is sometimes planted in Europe for forestry purposes and is also a very popular ornamental for parks and gardens. It is more shade-tolerant than European oaks. The timber is heavy, with red-brown heartwood, and is used for the same purpose as European oaks, though its quality is not as good.

The common oak grows mainly in moist bottomlands; it is the principal tree of lowland forests, where it occurs together with the elm, ash, hornbeam and lime. It grows at elevations up to 500 metres, provided that there is adequate moisture. It has a vast and deep root system and produces vigorous stump suckers when felled. The heavy, hard wood is used to make furniture.

Much like the common oak, the durmast oak tends to be somewhat smaller with a narrower crown. It has a similar range, but does not extend as far cast to regions with severe winters. Unlike the common oak it is a tree of the hills and is found at elevations up to 700 metres. It does not require soil as rich as the common oak, and even tolerates stony, acid soils. However, it requires plenty of light to thrive well. The durmast oak reaches a height of 30 to 40 metres, and its trunk is straighter than, but not as thick as, that of the common oak. The flowers, appearing 10 to 14 days later than those of the common oak, resemble them, but the female flowers, unlike those of its relative, are pressed close to the twig. The mature acorns are borne on very short stalks close to the twig.

The timber, with pale-brown heartwood, is not as highly prized as that of the smooth-leaved elm, and so this tree is hardly ever planted for forestry purposes.

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