Table 2. Semivariogram models and parameters for canopy structure and understory light environment.

Sites	Season	Indicator	Model	Nugget C0	Sill C0+C	Range (m)	Spatial structure ratio C/C0+C	Coefficient of determination R2	Residual sum of squares RSS
PF	Summer	CO	Gau	0.001	0.843	7.985	0.999	0.721	0.032
		LAI	Gau	0.001	0.789	9.405	0.999	0.724	0.057
		Tdir	Gau	0.093	0.965	6.668	0.904	0.932	0.002
		Tdif	Sph	0.001	0.842	8.230	0.999	0.722	0.014
		Ttot	Gau	0.001	0.874	8.833	0.999	0.816	0.031
	Winter	CO	Gau	0.001	0.828	7.742	0.999	0.602	0.046
		LAI	Gau	0.001	0.750	8.972	0.999	0.640	0.066
		Tdir	Sph	0.001	0.966	7.000	0.999	0.617	0.011
		Tdif	Gau	0.020	0.806	7.032	0.975	0.733	0.010
		Ttot	Gau	0.001	0.833	8.158	0.999	0.653	0.050
MF	Summer	CO	Sph	0.001	0.918	6.350	0.999	0.363	0.008
		LAI	Gau	0.001	1.026	7.898	0.999	0.633	0.073
		Tdir	Gau	0.083	1.096	7.621	0.924	0.879	0.012
		Tdif	Gau	0.001	0.972	7.760	0.999	0.594	0.072
		Ttot	Gau	0.001	1.056	7.604	0.999	0.725	0.039
	Winter	CO	Gau	0.001	1.066	8.678	0.999	0.792	0.047
		LAI	Gau	0.001	1.004	9.405	0.999	0.725	0.081
		Tdir	Sph	0.021	1.012	7.710	0.979	0.927	0.002
		Tdif	Sph	0.001	1.028	9.059	0.999	0.831	0.039
		Ttot	Gau	0.001	0.994	8.245	0.999	0.797	0.030

Note:

Sph, Spherical model; Gau, Gaussian model.