Spatial Distribution and Evolution of pH as a Function of Cation Exchange Capacity, Sum of Exchangeable Bases, and Organic Matter and Aluminum in the Soils of Foumban
Table 2
Statistical table of chemical parameters and pH of different soil units.
Rock substratum
Sample
Number of values
pH H20
CEC (meq/100 g)
SBE (meq/100 g)
MO (%)
(Ca + Mg)/K
Mean
SD
Mean
SD
Mean
SD
Mean
SD
Mean
SD
Gneiss
SU1
13
5.05
0.59
20.53
5.7
12.32
5.51
4.28
2.33
48.05
41.73
SU2
20
5.12
0.61
20.32
6.36
11
6.64
5.67
2.13
58.23
141.3
Migmatites
SU3
7
4.8
0.37
20.82
5.07
10.78
4.78
4.72
1.73
19.65
14.01
SU4
3
4.8
0.61
24.33
9.41
15.19
9.29
4.89
0.31
22.41
24.93
SU5
4
4.9
0.63
22.4
5.4
10.87
4.63
5.99
2.54
130.56
327.56
Basalts
SU6
17
4.8
0.57
18.25
6.99
8.66
5.58
5.38
1.71
43.16
29.46
SU7
14
5.4
0.8
29.76
3.68
17.1
4.41
7.6
3.4
27.98
23.57
SU8
2
5.1
0.2
17.67
14.65
5.91
5.2
4.42
0.36
22.8
26.13
Trachytes
SU9
4
5.1
0.52
16.22
8.5
6.9
4.06
4.19
0.78
19.05
12.88
SU10
3
4.9
0.78
16
2.81
7.95
3.09
3.39
0.71
37.12
31.01
Granites
SU11
3
4.9
0.53
16.35
4.87
6.86
5.1
3.03
0.32
34.28
30.02
SU: soil unit; %S: percentage of sands; %A: percentage of clays; %L: percentage of silts; SEB: sum of exchangeable bases; CEC: cation exchange capacity; Ca: calcium; Mg: magnesium; K: potassium. SD: standard deviation.
