Reclaiming Subsidized Land: An Evaluation of Coal Gangue Interlayers

Table 3

Acidity alkalinity, electrical conductivity (Eh), and total soil salt content.

	Treatment	0–10 cm	20–30 cm	40–50 cm	60–70 cm	80–90 cm	100–110 cm
pH	CK1	7.40 ± 0.09c	7.32 ± 0.11a	7.60 ± 0.33c	7.59 ± 0.26b	7.57 ± 0.12b	7.55 ± 0.14d
	CK2	7.42 ± 0.01abc	7.37 ± 0.16a	7.58 ± 0.25c	7.68 ± 0.00b	8.92 ± 0.26a	8.94 ± 0.08ab
	T1	7.53 ± 0.19abc	7.61 ± 0.18a	9.00 ± 0.44a	7.70 ± 0.18b	8.87 ± 0.14a	9.14 ± 0.13a
	T2	7.58 ± 0.05abc	7.61 ± 0.22a	8.02 ± 0.29bc	8.44 ± 0.26a	7.50 ± 0.10b	8.00 ± 0.10c
	T3	7.67 ± 0.05ab	7.68 ± 0.13a	8.25 ± 0.28abc	8.61 ± 0.37a	7.48 ± 0.06b	8.84 ± 0.31ab
	T4	7.47 ± 0.03abc	7.56 ± 0.10a	8.19 ± 0.35abc	7.60 ± 0.04b	7.69 ± 0.10b	8.69 ± 0.13ab
	T5	7.44 ± 0.02abc	7.45 ± 0.15a	8.57 ± 0.28ab	8.80 ± 0.10a	7.71 ± 0.20b	8.77 ± 0.14ab
	T6	7.43 ± 0.05abc	7.45 ± 0.11a	7.41 ± 0.11c	8.90 ± 0.27a	7.56 ± 0.06b	8.61 ± 0.12b
	T7	7.46 ± 0.01abc	7.39 ± 0.16a	7.49 ± 0.16c	8.53 ± 0.19a	7.86 ± 0.04b	8.93 ± 0.07ab
	T8	7.68 ± 0.06a	7.71 ± 0.08a	8.95 ± 0.04a	8.77 ± 0.15a	7.62 ± 0.12b	9.11 ± 0.10a
EC (us/cm)	CK1	63.00 ± 2.45d	75.33 ± 0.47c	94.00 ± 3.74c	95.33 ± 5.73b	98.67 ± 8.05c	109.33 ± 13.42a
	CK2	73.33 ± 4.64cd	83.00 ± 3.74bc	100.33 ± 2.36c	107.33 ± 7.72b	159.00 ± 4.32a	152.00 ± 6.16b
	T1	96.00 ± 5.89ab	101.00 ± 4.08abc	138.67 ± 2.05a	112.33 ± 4.50b	148.33 ± 4.03a	151.33 ± 12.36b
	T2	101.00 ± 4.32a	109.33 ± 4.19ab	135.33 ± 4.99a	153.67 ± 10.50a	108.00 ± 9.09bc	157.33 ± 19.95b
	T3	102.00 ± 2.94a	112.33 ± 8.73ab	134.67 ± 4.78a	151.33 ± 8.99a	112.67 ± 9.39bc	169.67 ± 9.67b
	T4	93.67 ± 8.73abc	99.67 ± 6.02abc	139.33 ± 4.19a	114.00 ± 11.43b	112.00 ± 6.48bc	163.00 ± 1.63b
	T5	89.00 ± 8.49abc	91.67 ± 17.33abc	133.67 ± 4.50a	162.33 ± 7.04a	111.33 ± 5.44bc	166.00 ± 8.04b
	T6	86.50 ± 0.41abc	94.67 ± 1.25abc	112.00 ± 7.35b	158.00 ± 5.72a	114.67 ± 4.64bc	153.67 ± 11.44b
	T7	78 ± 14.90bcd	84.67 ± 9.00bc	115.00 ± 6.68b	160.67 ± 7.59a	121.00 ± 2.16b	159.33 ± 21.82b
	T8	104.67 ± 5.73a	118.67 ± 20.55a	146.00 ± 3.56a	152.33 ± 4.11a	124.17 ± 9.85b	160.67 ± 9.74b
Total salt content (g/kg)	CK1	0.20 ± 0.01e	0.24 ± 0.00b	0.32 ± 0.05b	0.35 ± 0.04b	0.31 ± 0.03b	0.31 ± 0.02a
	CK2	0.27 ± 0.02c	0.25 ± 0.05b	0.32 ± 0.01b	0.36 ± 0.04b	0.51 ± 0.04a	0.51 ± 0.03b
	T1	0.30 ± 0.01ab	0.32 ± 0.02ab	0.53 ± 0.06a	0.43 ± 0.02ab	0.54 ± 0.03a	0.55 ± 0.04b
	T2	0.30 ± 0.01ab	0.32 ± 0.01ab	0.52 ± 0.04a	0.51 ± 0.02a	0.44 ± 0.02ab	0.51 ± 0.03b
	T3	0.32 ± 0.01a	0.35 ± 0.01ab	0.52 ± 0.04a	0.52 ± 0.04a	0.44 ± 0.02ab	0.54 ± 0.03b
	T4	0.28 ± 0.01bc	0.30 ± 0.00ab	0.51 ± 0.04a	0.43 ± 0.02ab	0.43 ± 0.02ab	0.52 ± 0.01b
	T5	0.28 ± 0.00bc	0.27 ± 0.03ab	0.51 ± 0.14a	0.52 ± 0.02a	0.44 ± 0.03ab	0.52 ± 0.02b
	T6	0.23 ± 0.00d	0.29 ± 0.06ab	0.33 ± 0.02b	0.51 ± 0.04a	0.44 ± 0.03ab	0.52 ± 0.04b
	T7	0.23 ± 0.02d	0.26 ± 0.03b	0.33 ± 0.02b	0.54 ± 0.03a	0.43 ± 0.02ab	0.51 ± 0.03b
	T8	0.33 ± 0.01a	0.38 ± 0.07a	0.51 ± 0.04a	0.51 ± 0.05a	0.44 ± 0.09ab	0.54 ± 0.02b