Table 3 RF residual kriging variance function fitting model and its parameters.

Kriging	Variational function model	Nugget effect	R²	SSR
RF Residual Ordinary Kriging, RFOK	Exponential	0.4834	0.645	42,186
	Spherical	0.5718	0.594	49,674
	Gaussian	0.6625	0.505	55,873
RF Residual C0-Kriging_pre, RFCK	Exponential	0.4587	0.675	41,612
	Spherical	0.5825	0.599	49,185
	Gaussian	0.6357	0.539	55,724
RF Residual C0-Kriging_tem, RFCK	Exponential	0.4723	0.658	41,737
	Spherical	0.6178	0.559	49,379
	Gaussian	0.6760	0.491	55,870
RF Residual C0-Kriging_slope, RFCK	Exponential	0.4756	0.651	41,867
	Spherical	0.6035	0.614	50,291
	Gaussian	0.6712	0.501	55,943
RF Residual C0-Kriging_elev, RFCK	Exponential	0.4823	0.649	42,158
	Spherical	0.5970	0.584	49,662
	Gaussian	0.6627	0.504	55,896

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