Table 3 Pearson correlation coefficients among fractal dimensions and soil chemical properties¹.

From: Research on the soil fractal characteristics and their correlation with soil properties in various forest types: insights from sub-humid area in Northern China

Indicator	Soil layer	D	D₀	D₁	D₂	D₁/D₀	SOC	N_T	P_T	K_T	Navi	Pavi	Kavi
D	Topsoil	1	0.91**	−0.81*	0.92**	−0.92**	0.91**	0.93**	0.85*	0.94**	0.82*	0.65	0.95**
D	Sub-topsoil	1	0.91**	−0.93**	0.65	−0.93**	0.82*	0.85*	0.93**	0.92**	0.91**	0.91**	0.63
D₀	Topsoil	0.91**	1	−0.92**	0.84*	−0.94**	0.83*	0.82*	0.74*	0.72*	0.74*	0.81*	0.54
D₀	Sub-topsoil	0.91**	1	−0.92**	0.83*	−0.94**	0.84*	0.83*	0.74	0.83*	0.75	0.84*	0.52
D₁	Topsoil	−0.81*	−0.92**	1	0.92**	0.93**	−0.92**	−0.81*	−0.83*	−0.83*	−0.70	−0.52	−0.85*
D₁	Sub-topsoil	−0.93*	−0.92**	1	−0.64	0.92**	−0.71	−0.84*	−0.86*	−0.83*	−0.84*	−0.81*	−0.46
D₂	Topsoil	0.92**	0.84*	0.92**	1	−0.94**	0.90*	0.93**	0.91**	0.91*	0.85*	0.71	0.91**
D₂	Sub-topsoil	0.65	0.83*	−0.64	1	−0.72	0.64	0.74*	0.60	0.54	0.54	0.85*	0.64
D₁/D₀	Topsoil	−0.92**	−0.94**	0.93**	−0.94**	1	−0.94**	−0.94**	−0.95**	−0.92**	−0.81*	−0.60	−0.93**
D₁/D₀	Sub-topsoil	−0.93**	−0.94**	0.92**	−0.72	1	−0.73*	−0.84*	−0.85*	−0.83*	−0.84*	−0.81*	−0.46
SOC	Topsoil	0.91**	0.83*	−0.92**	0.90**	−0.94**	1	0.83*	0.85*	0.97**	0.72	0.50	0.92**
SOC	Sub-topsoil	0.82	0.84*	−0.71	0.64	-0.73	1	0.63	0.56	0.80*	0.62	0.62	0.26
N_T	Topsoil	0.93**	0.82*	−0.81*	0.93**	−0.94**	0.83*	1	0.91**	0.84*	0.95**	0.81*	0.93**
N_T	Sub-topsoil	0.85*	0.83*	−0.84*	0.74	−0.84*	0.63	1	0.85*	0.80*	0.91*	0.83*	0.71
P_T	Topsoil	0.85*	0.74*	−0.83*	0.91**	−0.95**	0.85*	0.91**	1	0.82*	0.81	0.61	0.84*
P_T	Sub-topsoil	0.93**	0.74*	−0.86*	0.60	−0.85*	0.56	0.85*	1	0.91**	0.94**	0.91**	0.64
K_T	Topsoil	0.94**	0.72	−0.83*	0.91**	−0.92**	0.97**	0.84**	0.82*	1	0.73	0.52	0.94**
K_T	Sub-topsoil	0.92**	0.83*	−0.83*	0.54	−0.83*	0.80*	0.80*	0.91**	1	0.91**	0.81*	0.60
Navi	Topsoil	0.82*	0.74*	−0.70	0.85*	−0.81*	0.72	0.95**	0.81	0.73	1	0.91**	0.83*
Navi	Sub-topsoil	0.91**	0.75*	−0.84*	0.54	−0.84*	0.62	0.91**	0.94**	0.91**	1	0.92**	0.73
Pavi	Topsoil	0.65	0.81*	−0.52	0.71	−0.60	0.50	0.81*	0.61	0.52	0.91**	1	0.64
Pavi	Sub-topsoil	0.91*	0.84*	−0.81*	0.85*	−0.81*	0.62	0.83*	0.91**	0.81*	0.92**	1	0.75*
Kavi	Topsoil	0.95**	0.54	−0.85*	0.91**	−0.93**	0.92**	0.93**	0.84*	0.94**	0.83*	0.64	1
Kavi	Sub-topsoil	0.63	0.52	−0.46	0.64	−0.46	0.26	0.71	0.64	0.60	0.73	0.75	1

¹N_T presents the total nitrogen, P_T presents the total phosphorus, K_T presents total potassium, N_avi presents available nitrogen, P_avi presents available phosphorus, K_avi presents available potassium.

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Table 3 Pearson correlation coefficients among fractal dimensions and soil chemical properties¹.

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