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World’s Soil Resources

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FLUVISOLS (Fluvents, Fluv-Subroups)<br />

Fluvisols are soils developedin fluvial, lacustrine or marine deposits A noted characteristic is an irregular<br />

decrease in organic carbon. In fact, significant soil organic carbon is buried by depositional events. Typical<br />

horizonation is A-C 2<br />

-C 3<br />

-Ab (Figure A 33).<br />

Fluvisols are found in all climates except permafrost. Vegetation depends on climate and proximity to<br />

water. The relief is usually level. Most of the soils are of recent origin.<br />

Fluvisols occupy approximately 350 million ha of the land surface of the globe. Countries with more than<br />

20 million ha are Russia, China and Indonesia.<br />

Status of the <strong>World’s</strong> <strong>Soil</strong> <strong>Resources</strong> | Main Report Annex | <strong>Soil</strong> groups, characteristics,<br />

591<br />

distribution and ecosystem services

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