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fibrous root system : ウィキペディア英語版
fibrous root system

A fibrous root system is the opposite of a taproot system. It is usually formed by thin, moderately branching roots growing from the stem. A fibrous root system is universal in monocotyledonous plants and ferns. The fibrous root systems look like a mat made out of roots when the tree has reached full maturity.
Most trees begin life with a taproot, but after one to a few years change to a wide-spreading fibrous root system with mainly horizontal surface roots and only a few vertical, deep anchoring roots. A typical mature tree 30-50 m tall has a root system that extends horizontally in all directions as far as the tree is tall or more, but well over 95% of the roots are in the top 50 cm depth of soil.
A few plants with fibrous root systems:
* Coconut palm 〔P.K. Thampan. 1981. Handbook on Coconut Palm. Oxford & IBH Publishing Co.〕
* Grass
* Onion
Fibrous roots grow fairly close to the surface of the ground.
Leaves with parallel venation have fibrous roots.
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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