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rhizolith
Rhizoliths are root systems that have been encased in mineral matter. Rhizoliths are created through processes of chemical weathering, decomposition, reprecipitation and cementation. Rhizoliths are formed through the transport of dissolved Ca2+ and HCO3− enhancing the CaCO3 precipitation in a diameter of up to several centimeters around the roots. This is possible on calcareous sediments, where high amounts of Ca2+ in the rhizosphere can lead to the formation of encrustations around roots termed rhizoliths.
==Root Systems vs Burrow systems==
Rhizoliths, like animal burrows are commonly circular in cross-section and cylindrical in shape. They can vary in length from a few centimeters to several meters, the longest recorded in 〔 was 4 meters long. Burrows on the other hand, are generally less than a meter long but much larger burrows are known. Some have recorded vertical dwelling burrows up to 9 m long, but only 0.5 cm in diameter. The diameters of rhizoliths range from 0.1 mm to about 20 cm.
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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