Table 1. Soil geochemical properties in three sites under non-planting and planting treatmentsa.
Soil propertyb | Non-planting (N)c | Planting (N) | Non-planting (M) | Planting (M) | Non-planting (S) | Planting (S) |
---|---|---|---|---|---|---|
pH | 6.26 ± 0.10c | 6.28 ± 0.02c | 7.70 ± 0.12b | 8.68 ± 0.03a | 5.97 ± 0.22c | 5.09 ± 0.06d |
SOM (g kg−1) | 48.57 ± 2.94a | 48.85 ± 0.81a | 9.49 ± 0.32b | 7.39 ± 0.40b | 9.92 ± 0.41b | 10.50 ± 0.40b |
TN (g kg−1) | 2.13 ± 0.15a | 2.28 ± 0.08a | 0.61 ± 0.06b | 0.59 ± 0.06b | 0.64 ± 0.02b | 0.74 ± 0.06b |
TP (g kg−1) | 0.83 ± 0.02b | 0.91 ± 0.02a | 0.62 ± 0.02c | 0.57 ± 0.02c | 0.44 ± 0.00d | 0.45 ± 0.02d |
TK (g kg−1) | 18.53 ± 0.19a | 18.05 ± 0.13a | 17.84 ± 0.17a | 16.64 ± 0.42b | 9.86 ± 0.12c | 8.86 ± 0.22d |
AN (mg kg−1) | 161.7 ± 3.8b | 206.8 ± 4.8a | 41.8 ± 1.1d | 35.2 ± 1.1d | 52.8 ± 0.0c | 57.2 ± 1.1c |
AP (mg kg−1) | 33.04 ± 5.82a | 25.57 ± 2.12ab | 6.58 ± 0.26c | 2.26 ± 0.47c | 21.06 ± 1.32b | 20.32 ± 1.33b |
AK (mg kg−1) | 152.5 ± 1.4a | 150.8 ± 6.0a | 95.8 ± 5.1c | 62.5 ± 5.2d | 131.3 ± 3.6b | 143.3 ± 5.8ab |
NO3-N (mg kg−1) | 16.69 ± 0.31a | 6.98 ± 0.32b | 3.50 ± 0.16d | 4.15 ± 0.32d | 5.29 ± 0.17c | 5.24 ± 0.21c |
NH4-N (mg kg−1) | 0.32 ± 0.04d | 0.62 ± 0.05c | 0.79 ± 0.01b | 0.78 ± 0.08b | 1.51 ± 0.01a | 1.62 ± 0.04a |
aAll data are presented with mean ± SE, and values within the same row followed by the different letter indicate a significant difference at P < 0.05.
bAbbreviations: SOM, soil organic matter; TN, total nitrogen; TP, total phosphorus; TK, total potassium; AN, available nitrogen; AP, available phosphorus; AK, available potassium.
cN, north site with cold temperate climate; M, middle site with warm temperate climate; S, South site with subtropical climate.