Table 1 Statistical results of nitrogen, phosphorus and TOC contents of 0–30 cm soil layer in the study area (n = 4179, Aver., average value; s. d., Standard deviation; Max., maximum value; Min., minimum value; Med., median value).

	soil layer (cm)	TOC (g kg⁻¹)	NO₃^—N (mg kg⁻¹)	NH₄⁺-N (mg kg⁻¹)	TN (mg kg⁻¹)	TP (mg kg⁻¹)
Aver.		5.31	7.03	8.19	460.01	615.33
s. d.		2.74	12.34	6.91	254.43	96.21
Max.	0–10	20.23	60.95	44.45	1442.79	1023.41
Min.		1.69	0.33	1.05	122.40	439.52
Med.		4.80	2.60	5.80	415.44	607.28
Aver.		3.99	4.81	6.86	362.02	579.14
s. d.		2.14	8.36	5.25	186.00	90.32
Max.	10–20	12.54	56.05	29.95	1314.58	932.68
Min.		0.85	0.25	0.55	70.46	281.09
Med.		3.52	2.05	5.40	329.79	573.34
Aver.	20–30	3.30	4.19	6.52	302.40	578.68
s. d.		1.77	6.99	4.05	156.72	81.76
Max.		9.17	38.25	18.10	762.15	867.16
Min.		0.69	0.41	0.25	85.56	406.08
MED.		2.89	2.00	5.45	250.68	564.87
Aver.		4.21	5.36	7.20	375.91	591.27
s. d.		2.40	9.59	5.58	213.44	91.16
Max.	0–30	20.23	60.95	44.45	1442.79	1023.41
Min.		0.69	0.25	0.25	70.46	281.09
Med.		3.77	2.15	5.57	324.30	579.64

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