Table 3.

Correlation coefficients between characteristics of studied soils and fractions of Cd, Zn, and Cu

	Cd				Zn				Cu
	F1	F2	F3	F4	F1	F2	F3	F4	F1	F2	F3	F4
pH	− 0.167	− 0.486*	0.453*	− 0.216	− 0.296	0.371	0.042	− 0.130	− 0.036	0.230	0.103	− 0.037
Organic C	− 0.083	− 0.168	0.059	0.145	− 0.421*	0.097	0.041	0.005	− 0.401*	− 0.268	0.145	− 0.276
Sand	− 0.077	0.160	0.035	− 0.158	0.670*	0.180	0.161	− 0.617*	0.567*	0.392*	0.102	− 0.142
Silt	0.053	− 0.490*	0.268	0.008	− 0.046	0.232	0.248	− 0.283	0.128	− 0.067	0.353	− 0.245
Clay	− 0.001	− 0.089	0.120	− 0.105	− 0.531*	0.001	− 0.025	0.305	− 0.437*	0.108	− 0.037	0.013

F1, acid-soluble and exchangeable fraction; F2, reducible fraction; F3, oxidizable fraction; F4, residual fraction

*P < 0.05