Answer
Hi Elin,
in most trees the roots are not that deep at all. Most of the tree roots are in the top 50-100 cm of the soil. These are the nutritional roots of the tree, they are not thick and mainly grow horizontally. Their task is to absorb nutrients and water and these will be found most in the top layer of the soil.
In addition, the roots also serve to firmly fix the tree in the ground, so that it does not fall over or get blown over. That is why some roots will go deeper into the ground, these are anchoring roots. They are firmer and grow more in depth.
All roots together are called the root system. You can assume that the root system of a tree is about as wide as the crown of a tree. If you stand under the branches of a tree, its roots are under your feet, in the ground.
Regards,
Gert
Answered by
Dr. Gert Ausloos
Biology, botany
Nieuwelaan 38 1860 Meise
http://www.plantentuinmeise.be
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