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Figure 1

From: Organic/inorganic phosphorus partition and transformation in long-term paddy cultivation in the Pearl River Delta, China

Figure 1

Distribution of sequential fractionation of P in soil profiles across three soil cultivation ages. The depth of a specific soil horizon is not directly comparable to the width of bar. (NaHCO3-Pi, NaHCO3-extractable inorganic P; NaHCO3-Po, NaHCO3-extractable organic P; NaOH-Pi, NaOH-extractable inorganic P; NaOH-Po, NaOH-extractable organic P; Dil.HCl-Pi, dilute HCl-extractable inorganic P; Conc.HCl-Pi, concentrated HCl-extractable inorganic P; Conc.HCl-Po, concentrated HCl-extractable organic P; Residual-P, residual inorganic and organic P; PF200, PF400, and PF900 were the cultivation ages of 200, 400-yr and 900-yr, respectively).

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