Reclaiming Subsidized Land: An Evaluation of Coal Gangue Interlayers

Table 4

Total and available nitrogen of interlayered soil profiles.

	Treatment	0–10 cm	20–30 cm	40–50 cm	60–70 cm	80–90 cm	100–110 cm
TN (g/kg)	CK1	0.56 ± 0.03a	0.50 ± 0.06a	0.43 ± 0.02b	0.43 ± 0.02b	0.38 ± 0.05d	0.44 ± 0.37e
	CK2	0.53 ± 0.03a	0.49 ± 0.05a	0.41 ± 0.02b	0.45 ± 0.04b	1.26 ± 0.03a	1.28 ± 0.03bc
	T1	0.44 ± 0.03b	0.34 ± 0.02b	1.25 ± 0.09a	0.47 ± 0.01b	1.18 ± 0.01b	1.26 ± 0.02bc
	T2	0.43 ± 0.02b	0.33 ± 0.04b	1.13 ± 0.08a	1.13 ± 0.08a	0.40 ± 0.03d	1.20 ± 0.05bcd
	T3	0.41 ± 0.01b	0.34 ± 0.05b	1.33 ± 0.13a	1.41 ± 0.27a	0.43 ± 0.02d	1.32 ± 0.08ab
	T4	0.44 ± 0.02b	0.35 ± 0.05b	1.24 ± 0.05a	0.47 ± 0.6b	0.58 ± 0.04c	1.14 ± 0.05cd
	T5	0.45 ± 0.01b	0.35 ± 0.05b	1.32 ± 0.09a	1.26 ± 0.07a	0.54 ± 0.02c	1.40 ± 0.02a
	T6	0.45 ± 0.04b	0.36 ± 0.04b	0.41 ± 0.02b	1.22 ± 0.01a	0.55 ± 0.06c	1.15 ± 0.07cd
	T7	0.46 ± 0.01b	0.37 ± 0.04b	0.38 ± 0.02b	1.36 ± 0.01a	0.55 ± 0.05c	1.03 ± 0.05d
	T8	0.40 ± 0.03b	0.32 ± 0.04b	1.36 ± 0.19a	1.26 ± 0.03a	0.40 ± 0.03d	1.18 ± 0.01bcd
AN (mg/kg)	CK1	25.19 ± 0.98a	21.85 ± 1.38a	18.89 ± 0.44a	15.16 ± 0.38b	14.52 ± 0.12a	13.55 ± 1.41a
	CK2	24.96 ± 1.31a	21.27 ± 1.55a	18.29 ± 0.77a	14.09 ± 0.25b	9.94 ± 0.38b	10.30 ± 0.06b
	T1	21.24 ± 1.50b	17.61 ± 0.24bc	10.63 ± 0.95c	14.73 ± 0.69b	9.96 ± 0.40b	8.69 ± 0.11bc
	T2	19.96 ± 1.56b	15.74 ± 0.16bc	10.40 ± 0.60c	9.97 ± 0.20c	15.53 ± 1.32a	9.53 ± 0.27bc
	T3	19.33 ± 0.25b	15.79 ± 0.02bc	10.48 ± 0.50c	9.81 ± 0.80c	14.68 ± 0.78a	10.25 ± 0.57b
	T4	20.06 ± 0.41b	18.09 ± 0.72b	10.35 ± 0.50c	16.35 ± 0.28a	15.52 ± 0.54a	8.14 ± 0.33c
	T5	21.94 ± 0.55b	15.92 ± 0.60bc	10.63 ± 0.59c	9.78 ± 0.69c	15.91 ± 0.60a	9.40 ± 0.39bc
	T6	21.32 ± 0.91b	17.51 ± 0.35bc	15.53 ± 1.58b	9.71 ± 0.42c	15.27 ± 0.20a	10.25 ± 0.67b
	T7	21.94 ± 1.16b	17.64 ± 0.87bc	15.43 ± 0.35b	9.79 ± 0.54c	15.22 ± 0.81a	10.09 ± 0.28b
	T8	19.06 ± 0.13b	15.12 ± 0.48c	10.16 ± 0.42c	9.80 ± 0.39c	14.66 ± 0.94a	9.35 ± 0.24bc