Abstract
Information on phosphorus (P) adsorption and its impacts on the redistribution of the P fraction in soil profiles are important for environmental management under intensive agricultural practices. To clarify the dominant factors influencing soil phosphorus adsorption in an Entisol (locally known as purple soil), P adsorption experiments were conducted in Sichuan Basin of southwestern China for cropland and woodland soils with acidic, neutral and calcareous origins throughout their profile. After various doses of P were added during incubation experiments, soil P fractions were also analyzed. The results showed that there were no significant differences in Fe-oxides and P adsorption along the vertical gradients. Agricultural practices and lower pH conditions reduced the P adsorption capacity of purple soils throughout the soil profiles. For acidic and neutral purple soil profiles, the P adsorption capability was mainly influenced by Fe-oxides and soil texture. Ca-bound P and Fe-Al-bound P represented the majority of the total inorganic P of calcareous soils. There was a saturation of adsorption capacity by sesquioxide and a high risk of dissoluble reactive P (NH4Cl-P) being released out of the soil profile in acidic and neutral purple soils after the greatest P addition, indicated by the higher proportions of NH4Cl-P (over 40%) and decreasing Fe-Al-P fraction. P fractions migrated with greater difficulty in calcareous purple soil profiles as Ca-P fraction peaked over 65% when adding a P dose at or greater than 80 g P kg-1, indicating the high potential of P adsorption. The X-Ray Diffraction analysis also verified the formation of brushite. Adaptive management practices should be designed to alleviate P losses for acidic and neutral purple soils.
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Acknowledgements
This study was supported by National key R&D program (Grant No. 2016YFD0200309-7), Natural Science Foundation of China (Grant No. 41430750 and 41371241) and West Light Foundation of Chinese Academy of Sciences (Young Scholarship A). Furthermore, we sincerely thank the staff at Yanting Station for their support during the measurements.
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**ao, Y., Tang, Jl., Wang, Mk. et al. Impacts of soil properties on phosphorus adsorption and fractions in purple soils. J. Mt. Sci. 14, 2420–2431 (2017). https://doi.org/10.1007/s11629-017-4545-2
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DOI: https://doi.org/10.1007/s11629-017-4545-2