Further of Common walnut

The Walnut is already booked for the Tertiary. It is believed that in Syria, and western and southern Anatolia survived the ice ages. Their natural distribution in the Quaternary, it has in the eastern Mediterranean, the Balkan Peninsula as well as in Middle East and Central Asia. She is in a wet ravine forests of the mountains to find and grow in the Himalayas at altitudes up to 3300 m above sea level. NN.

Known are the walnut forests in Kyrgyzstan in the Tian Shan Mountains. Kyrgyzstan is a forested area with only 4% of waldärmsten Asian countries, but is home to the largest walnut stocks in the world. At an altitude zone from 1000 to 2000 m above sea level. NN are the trees in particular on the northern slopes of up to 30 m high and reach an age of 150 years. In the middle of these woods several pome and stone fruit species to grow, and the exploitation of stocks agroforestry.

There is some controversial evidence of the spread of the species in Central Europe already in the history, certainly they were cultivated since Roman times in many parts of southern, western and central Europe. So their actual distribution is strongly influenced by the cultivation as a fruit tree. In Central Europe, it usually comes in the form of cultivated on farms, in gardens or as a single tree in the field corridor. Occasionally they are found wild, mainly in lowland forests of the Rhine and the Danube. In Upper Austria, found in the lowland forests of the river Alm, Enns and Traun-fruited, quite hardy wild forms. These are called pointed, beak-or nut. It is unclear whether this is an indigenous Central European variety. Although the Walnut is found in the Alps up to about 1200 m, they rarely grow on sites about 800 m above sea level. The Walnut is also grown extensively in North America because of its tasty fruit, especially in California.

Since it is very sensitive to winter cold and late frosts, they are found frequently in mildest winters, not to low rainfall locations such as in wine-growing areas. It grows especially well on deep, fresh, nutrient-and calcium-rich clay and clay soils.

An additional distribution than forestry economy in spite of the high-quality timber tree species has so far hardly taken place since the Walnut tree light as less competitive (in the youth but schattentolerant) holds and therefore only partially integrated into current forestry concepts. First steps intended to create appropriate plant material, and attempts to silvicultural treatment in recent years, however, under way.

In addition, the stock of walnut, according to the Board of Trustees "Tree of the Year" in recent years by excessive use and lack-planting in Germany decreased greatly, which is why it was chosen as the "Tree of the Year 2008".


Source: http://de.wikipedia.org/wiki/Echte_Walnuss
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