Spatial pattern and driving factors of biomass carbon density for natural and planted coniferous forests in mountainous terrain, eastern Loess Plateau of China

Forest Ecosystems

Table 5 Estimated parameters of semivariogram based on the data of biomass carbon density and from cluster and outlier analysis for natural and planted coniferous forests

Forest type	Data	Model	Nugget (C₀)	Sill (C₀ + C)	Nugget effect C₀/(C₀ + C)	Range (km)	RSS	R²
Natural	Biomass carbon density	Exponential	0.2680	0.8710	0.692	57.6	0.0445	0.728
Natural	Cluster and outlier analysis	Gaussian	0.0470	0.5540	0.915	885.1	0.0015	0.915
Planted	Biomass carbon density	Exponential	0.0040	0.0349	0.887	15.3	0.0002	0.022
Planted	Custer and outlier analysis	Exponential	0.0306	0.1592	0.808	2133.0	0.0020	0.591