Table 3 Semi-variogram of the LER from 1985 to 2022.

Year	Model	Nug(C0)	Still (C + C0)	C0/(C + C0)/%	Range(m)	R²	Residual (×10 − ⁹)
1985	Gaussian model	0.000003	0.000014	77.10	206806.87	0.979	0.045
1990	Gaussian model	0.000093	0.000361	74.10	196414.56	0.980	2.468
1995	Gaussian model	0.000094	0.000321	70.80	177535.21	0.974	2.275
2000	Gaussian model	0.000101	0.000307	67.10	184809.82	0.960	2.940
2005	Gaussian model	0.000097	0.000289	66.40	201264.30	0.962	2.508
2010	Gaussian model	0.000106	0.000275	61.20	209231.74	0.936	3.409
2015	Gaussian model	0.000109	0.000253	56.70	203169.56	0.889	4.478
2020	Gaussian model	0.000108	0.000237	54.40	195721.74	0.872	4.198
2022	Gaussian model	0.000125	0.000251	50.20	234866.09	0.872	3.928

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