Table 1 Grain-size distribution, textural classes and smectite properties and proportion.
Profile | Horizon | Depth | Particle size [%] | Textural class | Octahedral occupancy of smectites [%] | Smectite in the parent material [%] | |||
|---|---|---|---|---|---|---|---|---|---|
[cm] | Clay (<2 µ) | Silt (2 µ-63 µ) | Sand (63 µ−2000 µ) | Dioctahedral | Trioctahedral | ||||
P1 | Bwb1 | 0–23 | 15 | 18 | 67 | Sandy Loam | 92 | 8 | |
Bwb2 | 23–34 | 15 | 19 | 66 | Sandy Loam | 97 | 3 | ||
Bwb3 | 34–45 | 14 | 19 | 67 | Sandy Loam | 92 | 8 | ||
Parent material | from Bwb3 horizon | 55 | 45 | 28.4 | |||||
2Abb | 45–60 | 17 | 21 | 62 | Sandy loam | 81 | 19 | ||
2Bab | 60–73 | 20 | 22 | 58 | Sandy clay loam | 91 | 9 | ||
Parent material | from 2ABb horizon | 68 | 32 | 33.6 | |||||
3Abb | 73+ | 20 | 15 | 65 | Sandy clay loam | 99 | 1 | ||
Parent material | from 3ABb horizon | 72 | 28 | 41.8 | |||||
P2 | Abb | 0–20 | 19 | 17 | 64 | Sandy clay loam | 98 | 2 | |
Bwb1 | 20–30 | 15 | 19 | 66 | Sandy loam | 98 | 2 | ||
Bwb2 | 30–53 | 15 | 18 | 67 | Sandy loam | 99 | 1 | ||
Bwb3 | 53+ | 15 | 13 | 72 | Sandy loam | 97 | 3 | ||
Parent material | from Bwb3 horizon | 75 | 25 | 29.7 | |||||
