Study on vertical variation characteristics of soil phosphorus adsorption and desorption in black soil region of Northeast China.

Both D max , D r , and RDP exhibited a decreasing trend with increasing soil depth before showing an upward trend.

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The correlation coefficients ranged from 0.991 to 0.997 and 0.990 to 0.995, respectively, indicating highly significant associations ( Table 4 ).

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The maximum adsorption capacity (Q max ) and maximum adsorption buffer capacity (MBC) of black soil in the study area ranged from 313.8 to 411.9 mg kg -1 and from 3.1 to 28.8 L kg -1 , respectively, within the soil layer of 0–100 cm depth, exhibiting an increasing trend with greater soil depth.

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