EEA.Sombriudox

Key to Great Groups 

EEA. Udox that have a sombric horizon within 150 cm of the mineral soil surface. Sombriudox, p. 682 

EEA. These are the Udox that have a sombric horizon. These soils are poorly understood. They have an increase in content of organic carbon in the subsoil. The only known pedons are near the Rift Valley in Africa. 

Definition 

Sombriudox are the Udox that have a sombric horizon within 150 cm of the mineral soil surface. 

Key to Subgroups 

EEAA. Sombriudox that have a petroferric contact within 125 cm of the mineral soil surface. Petroferric Sombriudox 

EEAB. Other Sombriudox that have a lithic contact within 125 cm of the mineral soil surface. Lithic Sombriudox 

EEAC. Other Sombriudox that have 16 kg/m2 or more organic carbon between the mineral soil surface and a depth of 100 cm. Humic Sombriudox 

EEAD. Other Sombriudox. Typic Sombriudox 

Definition of Typic Sombriudox 

Typic Sombriudox are the Sombriudox that:

1. Have neither a petroferric nor a lithic contact within 125 cm of the mineral soil surface; and

2. Have less than 16 kg of organic carbon per m2 to a depth of 1 m, exclusive of surface litter.

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