Table 2.
Phosphorus form classes or ratios of form classesa determined by 31P nuclear magnetic resonance spectroscopy for the studied soil samples under different land uses (means ± standard errors, n = 4)b.
| Land uses | Recovery | Pi | Po | TotPoly | IHP | Myo:other | Mono | Di | M:D | Cmono | CDiest | Deg | CM:D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Roadside | 34.9 ± 3.6 a | 46.3 ± 5.7 a | 53.7 ± 5.7 b | 3.2 ± 0.7 a | 13.8 ± 1.0 b | 0.4 ± 0 ab | 48.6 ± 4.5 b | 3.7 ± 1.8 a | 20.9 ± 6.5 a | 32.8 ± 3.3 c | 19.5 ± 2.5 a | 15.8 ± 1.7 a | 1.7 ± 0.1 a |
| Native grasslands | 43.1 ± 2.4 a | 31.5 ± 2.6 b | 68.5 ± 2.6 a | 3.7 ± 0.4 a | 18.4 ± 1.2 ab | 0.3 ± 0.1 ab | 63.1 ± 2.4 a | 3.9 ± 0.9 a | 19.3 ± 4.9 a | 43.0 ± 1.2 ab | 24.0 ± 1.8 a | 20.1 ± 1.4 a | 1.8 ± 0.1 a |
| Tame grasslands | 50.5 ± 6.6 a | 30.9 ± 2.7 b | 69.2 ± 2.7 a | 3.1 ± 0.2 a | 24.9 ± 3.8 a | 0.2 ± 0 b | 64.9 ± 2.8 a | 2.5 ± 0.6 a | 31.6 ± 7.8 a | 46.7 ± 3.8 a | 20.7 ± 1.9 a | 18.2 ± 2.4 a | 2.4 ± 0.4 a |
| Annual crop | 47.6 ± 6.7 a | 41.4 ± 2.3 ab | 58.6 ± 2.3 ab | 3.0 ± 0.6 a | 16.8 ± 2.3 b | 0.4 ± 0.1 a | 53.2 ± 1.7 b | 4.1 ± 0.7 a | 13.7 ± 1.6 a | 35.9 ± 1.9 bc | 21.4 ± 0.8 a | 17.3 ± 0.7 a | 1.7 ± 0.1 a |
a,bValues in each column followed by the same lowercase letters are not significantly different according to LSD (P < 0.05). Pi, inorganic P; Po, organic P; TotPoly, total polyphosphate, IHP, inositol hexakisphosphate; Myo:other, the ratio of myo-IHP to other IHP species; Mono, orthophosphate monoester; Di, orthophosphate diesters; M:D, the ratio of orthophosphate monoester to orthophosphate diesters; Deg, degradation; C denotes a correction for degradation products.