Table 3. Selected variables of soil physical and chemical properties in Quercus mongolica stands.

Horizon	Variable	Mean	Standard deviation	Minimum	Maximum
A horizon (n=91)	Sand (%)	51	16	24	87
	Silt (%)	32	13	11	61
	Clay (%)	16	8	1	34
	pH	4.2	0.3	3.5	5.2
	OM (mg g−1)	73	37	15	190
	TN (mg g−1)	2.9	1.2	0.6	6.9
	C/N	15.0	5.3	3.0	36.3
	P2O5 (mg kg−1)	61	54	4	226
	Ca2+ (cmolc kg−1)	0.56	0.48	0.11	2.13
	Mg2+ (cmolc kg−1)	0.24	0.18	0.05	0.98
	K+ (cmolc kg−1)	0.11	0.05	0.04	0.26
	Na+ (cmolc kg−1)	0.05	0.03	0.02	0.25
	CEC (cmolc kg−1)	22.5	6.5	9.6	38.4
B horizon (n=112)	Sand (%)	55	15	25	88
	Silt (%)	28	11	9	56
	Clay (%)	16	8	1	35
	pH	4.5	0.4	3.9	5.7
	OM (mg g−1)	34	23	6	119
	TN (mg g−1)	1.4	0.9	0.3	4.3
	C/N	15.5	10.2	5.7	67
	P2O5 (mg kg−1)	33	35	4	174
	Ca2+ (cmolc kg−1)	0.27	0.28	0.03	2.13
	Mg2+ (cmolc kg−1)	0.16	0.13	0.01	0.61
	K+ (cmolc kg−1)	0.08	0.03	0.02	0.18
	Na+ (cmolc kg−1)	0.04	0.02	0.02	0.13
	CEC (cmolc kg−1)	15.8	4.2	5.5	30.4