5.5 Key to Suborders of Aridisols |
67 |
|
|
Other Petrocalcids that have a petrocalcic horizon within 100 cm of the soil surface and lack all other characteristics of any other subsurface diagnostic horizon. These soils represent the central concept of the great group.
Typic Petrocalcids
5.5.3 Cambids
Key to Great Groups
Cambids that have only cambic horizon within 100 cm of the soil surface and lack all other characteristics of any other subsurface diagnostic horizon.
Haplocambids, p. 67
Haplocambids
Key to Subgroups
Haplocambids that have only cambic horizon within 100 cm of the soil surface and lack all other characteristics of any other subsurface diagnostic horizon. These soils represent the central concept of the great group.
Typic Haplocambids
5.5.4 Gypsids
Key to Great Groups
Gypsids that have a petrogypsic or petrocalcic horizon within 100 cm of the soil surface.
Petrogypsids, p. 70
Other Gypsids that have an argillic horizon within 100 cm of the soil surface.
Argigypsids, p. 68
Other Gypsids that have a calcic horizon within 100 cm of the soil surface.
Calcigypsids, p. 68
Other Gypsids that have only a gypsic horizon within 100 cm of the soil surface.
Haplogypsids, p. 68
68 |
5 Identification of the Taxonomic Class of a Soil |
|
|
Argigypsids
Key to Subgroups
Argigypsids that have both:
1.An ECe of more than 8 to less than 30 dS m−1 in a layer 10 cm or more thick, within 100 cm of the soil surface: and.
2.A calcic horizon overlying the gypsic horizon
Calcic Salidic Argigypsids
Other Argigypsids that have:
A calcic horizon overlying the gypsic horizon.
Calcic Argigypsids
Calcigypsids
Key to Subgroups
Calcigypsids that have a lithic contact within 50 cm of the soil surface.
Lithic Calcigypsids
Calcigypsids that lack all other diagnostic characteristics. These soils represent the central concept of the great group (Fig. 5.4).
Typic Calcigypsids
Haplogypsids
Key to Subgroups
Haplogypsids that have both:
1.An ECe of more than 8 to less than 30 dS m−1 in a layer 10 cm or more thick, within 100 cm of the soil surface: and.
2.A gypsic horizon within 18 cm of the soil surface.
Leptic Salidic Haplogypsids
Other Haplogypsids that have a gypsic horizon within 18 cm of the soil surface (Fig. 5.5).
Leptic Haplogypsids
5.5 Key to Suborders of Aridisols |
69 |
|
|
0 cm
Ak
30 cm
Bk
90 cm
By
110 cm
Fig. 5.4 A profile of Typic Calcigypsids. Gypsum accumulation begins at 90 cm depth. A calcic horizon occurs at 30–90 cm depth. A decalcified layer at 0–30 cm
Other Haplogypsids that have only a gypsic horizon and lack all other characteristics. These soils represent the central concept of the great group.
Typic Haplogypsids
70 |
5 Identification of the Taxonomic Class of a Soil |
|
|
0 cm
Ak
18 cm
By
70 cm
Fig. 5.5 A profile of Leptic Haplogypsids. Gypsum accumulation begins at 12–15 cm from soil surface
Petrogypsids
Key to Subgroups
Petrogypsids that have a petrocalcic horizon within 100 cm of the soil surface (Fig. 5.6).
Petrocalcic Petrogypsids
Other Petrogypsids that have both:
5.5 Key to Suborders of Aridisols |
71 |
|
|
Fig. 5.6 A profile of Petrocalcic Petrogypsids. The horizon below 25 cm meets the criteria for both a petrocalcic and a petrogypsic horizon
1.An ECe of more than 8 to less than 30 dS m−1 in a layer 10 cm or more thick, within 100 cm of the soil surface: and
2.A calcic horizon overlying the petrogypsic horizon.
Calcic Salidic Petrogypsids
Other Petrogypsids that have a calcic horizon overlying the petrogypsic horizon (Fig. 5.7).
Calcic Petrogypsids
Other Petrogypsids that have only a petrogypsic horizon and lack all other diagnostic subsurface horizons or characteristics. These soils represent the central concept of the great group (Fig. 5.8).
Typic Petrogypsids