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  • Humaquepts are the Aquepts that:1. Have an umbric, mollic, melanic, or histic epipedon;2. Do not have a sulfuric horizon that has its upper boundary within 50 cm of the mineral soil surface;3. Do not have, within 100 cm of the mineral soil surface, one or more horizons in which plinthite or a cemented or indurated diagnostic horizon either forms a continuous phase or constitutes one-half or more of the volume;4. Have an exchangeable sodium percentage (ESP) of less than 15 (or a sodium adsorption ratio [SAR] of less than 13) inhalf or more of the soil volume within 50 cm of the mineral soil surface or an ESP (or SAR) below 50 cm that remains constant or increases with increasing depth;5. Have neither a salic horizon nor a fragipan with its upper boundary within 100 cm of the mineral soil surface;6. Do not have a cryic soil temperature regime; and7. Do not have, in one or more layers at least 25 cm thick (cumulative) within 100 cm of the mineral soil surface, 25 percent or more (by volume) recognizable bioturbation, such as filled animal burrows, wormholes, or casts.
Source title Species Location Generic habitat Specific habitat Category of rate/density Summary stat Population value Unit of population Unit of confidence Confidence value
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