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En la tundra rigen los factores físicos como limitantes especialmente la temperatura aunque el agua también es escasa para las funciones biológicas. Las precipitaciones son escasas pero hay una baja tasa de evaporación. Se caracteriza por tener una capa del suelo permanente helada llamada permafrost que se divide en pergelisol que siempre está helada y mollisol que es la zona más superficial que puede descongelarse.

LA TUNDRA

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