Soil Organic Carbon Distribution in a Humid Tropical Plain of Cameroon: Interrelationships with Soil Properties

Table 6

Correlation matrix of the soil properties.

Clay

Sand

Silt

Sand/silt

Silt/clay

Clay ratio

WHC

BD

SOC

pH-H2O

pH-CaCl2

pH-KCl

Exch. Al^3+

Exch. H^+

Clay

1

Sand

−0.855^∗∗

1

Silt

−0.262

−0,277

1

Sand/silt

−0.814^∗∗

0.855^∗∗

−0.086

1

Silt/clay

−0.801^∗∗

0.505^∗∗

0.543^∗∗

0.764^∗∗

1

Clay ratio

0.963^∗∗

−0.784^∗∗

−0.327

−0.664^∗∗

−0.692^∗∗

1

WHC

−0.115

0.076

0.072

-0.019

0.045

−0.149

1

BD

−0.031

0.116

−0.160

0.247

0.095

0.003

−0.636^∗∗

1

SOC

0.172

−0.230

0.108

−0.317

−0.171

0.152

0.589^∗∗

−0.648^∗∗

1

pH-H2O

−0.667^∗∗

0.442^∗

0.407^∗

0.555^∗∗

0.730^∗∗

−0.634^∗∗

0.010

0.191

−0.333

1

pH-CaCl2

−0.658^∗∗

0.474^∗∗

0.329

0.614^∗∗

0.738^∗∗

−0.591^∗∗

0.036

0.130

−0.295

0.902^∗∗

1

pH-KCl

−0.683^∗∗

0.603^∗∗

0.135

0.624^∗∗

0.617^∗∗

−0.618^∗∗

0.067

0.124

−0.305

0.843^∗∗

0.912^∗∗

1

Exch. Al^3+

0.173

−0.177

0.039

−0.148

0.057

0.238

0.480^∗

−0.301

0.707^∗∗

−0.381

−0.376

−0.291

1

Exch. H^+

0.708^∗∗

−0.682^∗∗

0.067

−0.603^∗∗

−0.390

0.702^∗∗

0.073

−0.089

0.456^∗

−0.788^∗∗

−0.700^∗∗

−0.762^∗∗

0.606^∗∗

1

Correlation is significant at the 0.01 level (2-tailed); ∗correlation is significant at the 0.05 level (2-tailed). SOCS: SOC stock.