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Table 4.

Model parameter of isotropic variogram for land use eco-risk index in 1995 and 2005.

Year	Fitting model	Nugget	Sill	Range	Effective	Proportion	r²	RSS
Year	Fitting model	C₀	C₀ + C	Parameter A₀	Range	C/C₀ + Cssss	r²	RSS
1995	Spherical model	0.00270	0.04570	611000	11000	0.941	0.898	5.190E-05
	Exponential model	0.00220	0.07650	611000	33000	0.971	0.883	5.954E-05
	Linear model	0.00277	0.02662	233949	33949	0.896	0.910	1.964E-03
	Gaussian model	0.00700	0.16980	611000	58283	0.959	0.978	1.138E-05
2005	Spherical model	0.01440	0.07560	611000	11000	0.810	0.963	3.545E-05
	Exponential model	0.01360	0.11980	611000	33000	0.886	0.961	3.866E-05
	Linear model	0.01462	0.04832	233949	33949	0.842	0.960	3.293E-05
	Gaussian model	0.02110	0.20490	555800	52673	0.897	0.930	6.686E-05