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USDA soil taxonomy
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== Soil temperature regimes == [[File:Global Distribution of Soil Temperature Regimes.jpg|thumb|upright=1.75|Global distribution of soil temperature regimes]] Soil temperature regimes, such as frigid, mesic, and thermic, are used to classify soils at some of the lower levels of the Soil Taxonomy. The cryic temperature regime distinguishes some higher-level groups. These regimes are based on the mean annual soil temperature (MAST), mean summer temperature, and the difference between mean summer and winter temperatures all at a soil depth of 50 cm. It is normally assumed that the MAST (in °C) equals the sum of the mean annual air temperature plus 2 °C. If the difference between mean summer and winter temperatures is less than 6 °C, then add "Iso" at the front of the name of the Soil Temperature Class. {| class="wikitable" style="margin:auto;" |- ! scope="col" style="width:100px;" rowspan="1.5"| Soil temperature regime ! scope="col" style="width:100px;" colspan="1.5"| Temperature range |- | Pergelic || ~ -8 °C to -4 °C |- | Subgelic || ~ -4 °C to 0 °C |- | Frigid || ~ 0 °C to 8 °C |- | Mesic || 8 °C to 15 °C |- | Thermic || 15 °C to 22 °C |- | Hyperthermic || 22 °C or higher |- |}
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