Spatial Differentiation of Ecological Stoichiometry of Nitrogen and Phosphorus in Mollic Epipedon of China

Table 2

Parameters of the semivariogram models for soil TN, TP contents, and N/P ratio.

Index	Theoretical model	Nugget	Massive gold effect	Variation	Fitting residual error	R ^2
TN	Gaussian	0.319	0.152	5.417	4.520 × 10^−2	0.899
TP	Exponential	0.423	0.262	4.400	3.480 × 10^−2	0.863
N/P	Gaussian	0.468	0.462	2.075	2.214 × 10^−2	0.874