Multivariate-Statistical Assessment of Heavy Metals for Agricultural Soils in Northern China

Table 4

Spatial correlation for heavy metals.

	Model	Nugget; 𝐶0	Sill; 𝐶 + 𝐶0	𝐶0/(𝐶 + 𝐶0); (%)	Range; (km)
𝑃Cu	Spherical	0.0037	0.0064	58.40	0.0746
𝑃Zn	Spherical	5.8𝑒−05	0.0001	44.25	0.05
𝑃Ni	Exponential	0.0007	0.0015	45.58	0.1192
𝑃Pb	Spherical	0.0023	0.0038	59.74	0.0613
𝑃Cr	Exponential	0.0016	0.0034	48.24	0.0384
𝑃Hg	Spherical	0.0019	0.0041	46.49	0.0521