Soil Organic Carbon Distribution in a Humid Tropical Plain of Cameroon: Interrelationships with Soil Properties
Table 4
Physical properties of the soils.
Horizon
Depth (cm)
BD (Mg m−3)
Porosity (%)
WHC (%)
Sand (%)
Silt (%)
Clay (%)
Clay ratio
Sand/silt ratio
Silt/clay ratio
Textural class
Profile 1. Bamia series
Ap
0–10
1.07
59.62
40.22
33
35
32
0.47
0.94
1.09
CL
AB
10–24
1.16
56.23
40.07
30
23
47
0.89
1.30
0.49
C
Bw1
24–42
1.20
54.72
40.40
27
27
46
0.85
1.00
0.59
C
Bw2
42–72/90
1.32
50.19
30.74
37
27
36
0.56
1.37
0.75
CL
Bw3
72/90–102
1.25
52.83
30.46
36
29
35
0.54
1.24
0.83
CL
Cr1
102–157
1.01
61.89
30.97
50
23
27
0.37
2.17
0.85
SCL
Cr2
157–215
1.23
53.58
30.54
46
35
19
0.23
1.31
1.84
L
Profile 2. Santchou series
Ah
0–12
0.66
75.09
49.02
42
32
26
0.35
1.31
1.23
L
2Bt/E
12–38
1.13
57.34
31.85
20
15
65
1.86
1.33
0.23
HC
2E/Bt
38–58
1.11
58.11
32.21
24
16
60
1.50
1.50
0.27
C
2Btg2
58–90
1.15
56.60
34.90
17
17
66
1.94
1.00
0.26
HC
2Btg3
90–115
1.30
50.94
36.55
46
15
39
0.64
3.07
0.38
SC
2C1
115–167
1.34
49.43
33.48
56
14
31
0.44
4.00
0.45
SCL
2C2
167–205
1.40
47.17
28.02
65
19
16
0.19
3.42
1.19
SL
Profile 3. Lelem series
A
0–18
1.15
56.60
31.75
28
31
41
0.69
0.90
0.76
C
Bt1
18–43
1.19
55.09
35.15
19
35
46
0.86
0.54
0.76
C
Bt2
43–73
1.19
55.09
31.22
15
25
60
1.50
0.60
0.41
C
Btg
73–118/134
1.09
58.87
31.40
16
33
51
1.04
0.48
0.65
C
BCtg
118/134–175
1.14
56.98
29.98
15
26
59
1.44
0.58
0.44
C
Profile 4. Ntengie series
Ap
0–27
0.92
65.28
35.68
39
33
28
0.39
1.18
1.18
CL
AB
27–50
0.78
70.57
42.64
54
20
26
0.35
2.70
0.77
SCL
Cg
50–82
1.11
58.11
35.05
64
12
24
0.32
5.33
0.50
SCL
2AB
82–116
0.80
69.81
38.88
47
24
29
0.41
1.96
0.83
SCL
2Btg
116–160
1.11
58.11
27.12
33
32
35
0.54
1.03
0.91
CL
2BC
160–210
1.18
55.47
36.34
36
26
38
0.61
1.38
0.68
CL
Profile 5. Bamengwi series
Ap
0–25
1.03
61.13
35.01
29
44
27
0.37
0.66
1.63
CL
AB
25–44
1.01
61.89
37.61
38
40
22
0.28
0.95
1.82
L
BCt
41–66
1.30
50.94
28.06
43
24
33
0.49
1.79
0.73
CL
2Cg1
66–102
1.30
50.94
32.82
59
29
12
0.14
2.03
2.42
SL
3Cg2
102–134
1.31
50.57
33.08
28
42
29
0.41
0.67
1.45
CL
4Cg3
134–162
1.32
50.19
33.74
64
24
12
0.14
2.67
2.00
SL
5Cg4
162–205
1.29
51.32
35.16
62
27
11
0.12
2.30
2.45
SL
Textural class according to FAO [60]. WHC water holding capacity, CL clay loam, C clay, SCL sandy clay loam, L loam, HC heavy clay, SC sandy clay, and SL sandy loam.
