Isofrigid--The mean annual soil temperatu re is lower than 8°C.
Isomesic--The mean annual soil temperature is 8&# 176;C or higher but lower than 15°C.
Isothermic--The mean annual soil temperature is 15°C or higher but lower than 22°C.
Isohyperthermic--The mean annual soil temp erature is 22°C or higher.
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8/10/98