Table 1. Sampling site characteristics and soil properties.

Region	No.1)	pH	SOC2) g kg−1	TN g kg−1	C/N	NH4+ mg kg−1	NO3− mg kg−1
Northern	1	5.0	30.1	2.3	13.3	20.5	10.6
	2	4.9	46.0	3.7	12.6	20.7	13.7
	3	4.8	48.6	3.7	13.2	3.1	10.2
	4	5.3	59.8	4.2	14.1	31.9	13.3
	5	4.9	83.0	8.4	9.9	9.9	21.8
	6	5.5	21.4	1.7	12.9	0.5	5.4
	7	7.4	46.7	4.0	11.7	6.3	68.5
	8	6.7	68.2	5.5	12.4	4.7	50.8
Southern	9	4.2	24.2	1.6	15.1	19.2	2.9
	10	4.3	24.1	1.1	21.9	18.8	3
	11	4.3	23.2	1.1	21.1	17.5	2.5
	12	4.2	62.8	3.1	20.3	45.1	1
	13	4.5	13.2	0.9	14.7	93.2	10
	14	4.6	30.4	2.3	13.3	16.2	3.9
	15	4.6	30.4	2.3	13.3	16.3	3.9
	16	4.1	68.2	3.9	17.7	33.4	4.2
	17	4.3	29.3	2.7	10.7	8.6	7.7
	18	4.3	33.3	3.0	11.1	16.1	6.1
	19	4.7	29.1	1.8	16.5	26.3	7.1
	20	4.6	18	0.6	29.2	2.1	1.7
	21	4.9	16	0.7	24.1	2.2	2
	22	4.7	18.1	0.8	21.6	2.4	2.1
	23	4.3	53.5	1.4	39.6	3.8	1.4
	24	4.5	56.2	2.4	23.8	23.8	2.5
	25	4.6	43.1	3	14.5	24.4	5.4
Northern soils3)		5.6b	50.5a	4.2b	12.5a	12.2a	24.3a
Southern soils (lab incubation)		4.5a	31.9a	1.58a	21.6b	22.4a	3.2a
Southern soils (field incubation)4)		4.4a	38.1a	2.7ab	13.9a	20.1a	5.8a

¹⁾No., site number according to soil site listed from north to south.

²⁾SOC, soil organic C; TN, total N.

³⁾Identical letters indicate no significant differences in the average values.

⁴⁾Gross N transformation rates in soils 15–19 were determined by field incubation.