Geoscience Reference
In-Depth Information
Table 21.1
(continued)
Horizon
a
Org. C (%) Clay (%) CEC (cmol(+)/kg) Base sat. (%) Al
c
Depth (cm) Munsell color (moist) pH
References
AB
19-30
2.5YR 3/4
5.1
1.36
55.9
Bw
30-48
2.5YR 4/3
5.1
1.01
56.1
Bso1
48-86
2.5YR 3/6
5.0
0.10
55.4
Bso2
86-140
2.5YR 3/4
4.9
0.72
53.8
4.7
1.3
56.4
12.2
3.7
Average true sombric
4.8
1.0
52.7
7.3
4.6
Average above true sombric
a
Sombric or sombric-like horizon in boldface
b
Pedon contains true sombric horizon
c
Al
: a = exchangeable Al (mmol(+)/kg soil; b = oxalate-extractable Fe (%); and c = pyrophosphate-extractable Al (%)
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