Table 2 Effects of different vegetation types on soil nutrients in 0–60 cm newly cultivated land in loess region.
Species | Depth (cm) | SOM (g.kg−1) | TN (g.kg−1) | TP (g.kg−1) | TK (g.kg−1) | AN (mg.kg−1) | AK (mg.kg−1) | AP (mg.kg−1) |
---|---|---|---|---|---|---|---|---|
Alfalfa | 0–20 | 4.11 ± 0.67Aa | 0.25 ± 0.02 Aa | 0.62 ± 0.01 Ba | 17.63 ± 0.43 ABa | 9.47 ± 1.72 Ba | 66.00 ± 6.25 Ab | 3.83 ± 0.55 Aa |
20–40 | 4.89 ± 0.52 Aa | 0.27 ± 0.02Ba | 0.63 ± 0.06 Aa | 18.04 ± 0.15 Aa | 9.70 ± 1.71 Ba | 58.00 ± 2.65 Aa | 2.43 ± 0.47 Aa | |
40–60 | 6.09 ± 0.34Ab | 0.32 ± 0.020Bb | 0.67 ± 0.02 Aa | 17.72 ± 0.33 Aa | 13.70 ± 1.01 Cb | 59.44 ± 6.95 Aa | 8.33 ± 1.00 Cb | |
Mean | 5.03 ± 0.98 | 0.28 ± 0.03 | 0.64 ± 0.04 | 17.72 ± 0.33 | 10.96 ± 2.44 | 59.44 ± 6.95 | 4.87 ± 2.74 | |
Oatgrass | 0–20 | 4.69 ± 0.27ABa | 0.25 ± 0.05 Aa | 0.58 ± 0.01 Aa | 17.68 ± 0.37 ABa | 9.00 ± 1.56 ABa | 59.67 ± 2.08 Aa | 6.47 ± 0.12 Aa |
20–40 | 4.94 ± 0.20 Aa | 0.28 ± 0.03 Ba | 0.58 ± 0.02 Aa | 17.55 ± 0.31 Aa | 9.00 ± 1.56 Aa | 62.00 ± 16.52 Aa | 8.03 ± 1.67Ba | |
40–60 | 5.94 ± 0.14 Ab | 0.45 ± 0.02Cb | 0.65 ± 0.04 Ab | 17.86 ± 0.13 Ab | 6.57 ± 1.35 Ab | 52.67 ± 4.73 Aa | 6.97 ± 0.40Ba | |
Mean | 5.19 ± 0.60 | 0.33 ± 0.09 | 0.60 ± 0.04 | 17.70 ± 0.29 | 10.57 ± 1.35 | 58.11 ± 9.62 | 7.16 ± 1.10 | |
Control check | 0–20 | 4.89 ± 0.17Ba | 0.26 ± 0.02 ABa | 0.59 ± 0.01 Ab | 17.40 ± 0.16 Aa | 6.80 ± 0.35Aa | 69.00 ± 16.52 Aa | 4.73 ± 3.78 Ab |
20–40 | 4.60 ± 0.28 Aa | 0.24 ± 0.01 Aa | 0.57 ± 0.00 Aa | 17.70 ± 0.43 Aa | 8.77 ± 0.75ABb | 57.67 ± 3.51 Aa | 7.20 ± 0.85Ba | |
40–60 | 5.60 ± 0.43 Ab | 0.30 ± 0.01 Bb | 0.66 ± 0.02 Aa | 17.61 ± 0.27 Aa | 12.17 ± 1.02ABc | 55.00 ± 2.65 Aa | 2.83 ± 0.06Ac | |
Mean | 5.03 ± 0.52 | 0.27 ± 0.03 | 0.61 ± 0.04 | 17.57 ± 0.29 | 9.24 ± 2.44 | 60.56 ± 10.70 | 4.92 ± 2.71 |