Research Article
Soil Phosphorus Forms and Profile Distributions in the Tidal River Network Region in the Yellow River Delta Estuary
Table 3
Mean content (mg kg−1) of P forms of the tidal river network region soil profiles in the Yellow River Delta estuary.
| Soil | Depth (cm) | Resin-P | Bicarb-Pi | NaOH-Pi | D.HCl-Pi | C.HCl-Pi | Residual-P | Bicarb-Po | NaOH-Po | C.HCl-Po | Pi | Po | Pt |
| BRB | 0–10 | 12.5 | 5.2 | 4.5 | 414.1 | 51.3 | 41.0 | 26.6 | 34.9 | 30.4 | 528.6 | 102.5 | 620.5 | 10–20 | 11.3 | 4.3 | 4.8 | 418.8 | 50.0 | 37.1 | 26.5 | 32.6 | 27.9 | 526.2 | 96.2 | 613.3 | 20–30 | 9.5 | 4.7 | 4.0 | 414.5 | 42.4 | 33.4 | 33.7 | 33.5 | 28.2 | 508.6 | 100.6 | 604.0 | 30–40 | 9.1 | 4.2 | 3.6 | 417.7 | 44.5 | 35.4 | 29.6 | 37.2 | 33.9 | 514.5 | 102.2 | 615.1 | 40–50 | 7.9 | 3.1 | 3.6 | 440.5 | 41.8 | 39.9 | 31.9 | 25.7 | 32.5 | 536.9 | 97.5 | 627.1 | 50–60 | 7.1 | 3.6 | 3.8 | 415.5 | 40.8 | 34.3 | 31.8 | 28.3 | 27.6 | 505.1 | 94.4 | 592.9 |
| RB | 0–10 | 14.6 | 5.8 | 5.3 | 423.1 | 61.1 | 40.2 | 50.6 | 44.9 | 19.0 | 550.0 | 135.7 | 664.5 | 10–20 | 10.5 | 5.3 | 5.4 | 394.1 | 65.9 | 44.5 | 39.8 | 46.5 | 23.8 | 525.7 | 130.8 | 635.8 | 20–30 | 9.8 | 4.0 | 5.0 | 410.2 | 51.6 | 44.5 | 33.7 | 38.9 | 20.3 | 525.1 | 117.1 | 618.0 | 30–40 | 10.1 | 4.4 | 5.2 | 418.2 | 60.4 | 44.9 | 42.1 | 44.4 | 19.7 | 543.1 | 131.4 | 649.3 | 40–50 | 10.5 | 4.8 | 5.9 | 417.1 | 70.6 | 40.1 | 41.8 | 44.3 | 28.2 | 549.0 | 126.1 | 663.3 | 50–60 | 10.7 | 5.4 | 5.7 | 441.6 | 60.2 | 38.2 | 37.0 | 44.4 | 21.0 | 561.8 | 119.5 | 664.1 |
| TB | 0–10 | 18.4 | 8.2 | 7.5 | 421.9 | 78.7 | 46.4 | 20.7 | 26.6 | 26.4 | 581.1 | 93.7 | 654.8 | 10–20 | 15.6 | 6.5 | 5.9 | 420.6 | 71.8 | 46.7 | 16.8 | 27.2 | 21.6 | 567.1 | 90.7 | 632.7 | 20–30 | 12.8 | 4.5 | 5.1 | 420.5 | 67.2 | 46.3 | 14.1 | 22.7 | 19.1 | 556.4 | 83.1 | 612.4 | 30–40 | 14.2 | 5.1 | 5.2 | 424.8 | 70.7 | 50.4 | 18.7 | 25.9 | 20.1 | 570.4 | 95.0 | 635.1 | 40–50 | 14.5 | 5.4 | 5.3 | 420.8 | 83.5 | 50.8 | 20.5 | 25.8 | 28.3 | 580.3 | 97.0 | 654.9 | 50–60 | 12.1 | 5.0 | 5.2 | 432.4 | 70.6 | 40.6 | 15.2 | 26.0 | 20.7 | 565.8 | 81.8 | 627.8 |
| TCB | 0–10 | 18.8 | 9.7 | 7.7 | 419.6 | 82.4 | 44.3 | 40.1 | 24.3 | 29.7 | 582.5 | 108.6 | 676.5 | 10–20 | 18.7 | 7.7 | 6.6 | 414.2 | 71.3 | 49.3 | 40.6 | 15.9 | 30.1 | 567.9 | 105.8 | 654.5 | 20–30 | 15.4 | 6.5 | 5.4 | 416.7 | 75.9 | 50.9 | 36.5 | 24.0 | 22.5 | 570.8 | 111.4 | 653.8 | 30–40 | 15.8 | 6.5 | 5.4 | 407.7 | 71.1 | 45.6 | 36.8 | 18.7 | 33.4 | 552.0 | 101.2 | 640.9 | 40–50 | 16.0 | 6.4 | 5.6 | 407.6 | 83.2 | 47.0 | 37.5 | 23.9 | 29.7 | 565.8 | 108.4 | 656.9 | 50–60 | 15.0 | 5.6 | 6.2 | 421.9 | 84.2 | 45.3 | 33.8 | 25.8 | 26.1 | 578.3 | 104.9 | 664.0 |
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