Geoscience Reference
In-Depth Information
8.3 Classification of Soils with Folistic and Histic
Epipedons
Folistic epipedons are recognized in ST both in Histosols and in mineral soils.
However, of the 32 soil series containing a folistic epipedon, all but one is in the
Histosol order (Table
8.3
). Of the soils containing a histic epipedon (excluding
Folists), 68 % of the soil series are in the Histosol order and 20 % are in the
Inceptisols. Mollisols, Andisols, Entisols, Spodosols, and Alfisols all contain soil
series in histic subgroups (Table
8.4
). Gelisols contain soils with a histic epipedon
in the Histel suborder and in the Histoturbel and Historthel great groups.
8.4 Distribution of Soils with Folistic and Histic Epipedons
The distribution of soils with a histic epipedon can be seen by mapping Histosols
since this order accounts for 68 % of the soil series with a histic epipedon.
Aquepts with a histic epipedon comprise only 13 % of all Aquepts. Soils with
histic epipedons occur in three general regions: the Great Lakes (Minnesota
(MN), MI, Wisconsin (WI), northern Indiana (IN), FL, the Mid-Atlantic Coast
(NC), with smaller areas in southern Louisiana (LA) and northern New York
(NY); Fig.
8.3
). Histosols occur in 44 of the 50 states. The total area of soils
Table 8.3 Classification of soil series with a folistic epipedon
No. of soil
series
Order
Suborder
Great group
Subgroup
Andisols
Cryands
Fulvicryands
Folistic (0)
0
Haplocryands
Folistic (0)
0
Vitricryands
Folistic (0)
0
0
Gelisols
Histels
Folistels
Typic (1)
Orthels
Haplorthels
Folistic (0)
0
Mollorthels
Folistic (0)
0
Umbrorthels
Folistic (0)
0
Turbels
Haploturbels
Folistic (0)
0
Molliturbels
Folistic (0)
0
Umbriturbels
Folistic (0)
0
1
Histosols
Folists
Cryofolists
Lithic (2), Typic (4)
6
Torrifolists
Typic (1)
1
Udifolists
Lithic (11), Typic (7)
18
Ustifolists
Lithic (3), Typic (3)
6
31
Inceptisols
Cryepts
Dystrocryepts
Folistic (0)
0
Spodosols
Cryods
Humicryods
Folistic (0)
0
Total
32
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