Table 1.
P rate (mg kg−1) | Shoot biomass (g per pot) | Root biomass (g per pot) | Shoot P concentration (mg g−1) | Total root length (m per pot) | Specific root length (m g−1) | Proportion of root length in different diameters to total root length (%) | ||
---|---|---|---|---|---|---|---|---|
<0.2 mm | 0.2–0.4 mm | >0.4 mm | ||||||
0 | 0.25 ± 0.01f | 0.15 ± 0.00f | 0.98 ± 0.03h | 26.3 ± 1.2d | 173 ± 6f | 69.5 ± 0.7g | 24.3 ± 0.6a | 6.2 ± 0.3bc |
2.5 | 0.30 ± 0.01f | 0.18 ± 0.01ef | 0.97 ± 0.03h | 32.2 ± 1.5dc | 180 ± 3f | 70.9 ± 1.0gf | 23.6 ± 0.8ab | 5.5 ± 0.2cd |
5 | 0.28 ± 0.02f | 0.18 ± 0.01ef | 1.09 ± 0.06h | 37.5 ± 2.7dc | 210 ± 8e | 73.8 ± 0.9efg | 21.3 ± 0.6bc | 4.9 ± 0.4de |
10 | 0.32 ± 0.02f | 0.19 ± 0.01e | 1.23 ± 0.03h | 43.3 ± 4.3c | 224 ± 9de | 76.4 ± 1.3cd | 19.4 ± 1.1cd | 4.2 ± 0.3efg |
25 | 0.68 ± 0.04e | 0.26 ± 0.02d | 2.35 ± 0.06g | 78.4 ± 6.1ab | 295 ± 8a | 81.3 ± 1.1b | 15.3 ± 1.1efg | 3.4 ± 0.2g |
50 | 1.06 ± 0.05d | 0.28 ± 0.01d | 3.18 ± 0.05f | 80.6 ± 8.0ab | 289 ± 18ab | 84.6 ± 0.9a | 11.9 ± 0.6h | 3.5 ± 0.3fg |
75 | 1.25 ± 0.03c | 0.32 ± 0.01ab | 3.68 ± 0.09e | 84.0 ± 4.7a | 265 ± 15abc | 81.8 ± 0.8ab | 13.7 ± 0.8gh | 4.5 ± 0.2def |
150 | 1.49 ± 0.03b | 0.29 ± 0.01bcd | 4.71 ± 0.13d | 75.7 ± 5.2ab | 261 ± 8bc | 78.9 ± 1.6bc | 15.0 ± 1.1fg | 6.1 ± 0.5c |
300 | 1.44 ± 0.05b | 0.28 ± 0.02cd | 5.08 ± 0.19c | 69.6 ± 7.0b | 244 ± 10cd | 76.1 ± 1.1cd | 16.6 ± 0.7ef | 7.3 ± 0.4ab |
600 | 1.45 ± 0.05b | 0.31 ± 0.01abc | 5.83 ± 0.15b | 79.3 ± 2.4ab | 252 ± 8cd | 75.1 ± 0.9de | 17.5 ± 0.7de | 7.4 ± 0.2a |
1200 | 1.68 ± 0.12a | 0.34 ± 0.01a | 7.12 ± 0.05a | 82.9 ± 5.3ab | 245 ± 15cd | 72.5 ± 1.8efg | 19.4 ± 1.1cd | 8.2 ± 0.8a |