Biogeosciences
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Articles | Volume 12, issue 21
Articles | Volume 12, issue 21
https://doi.org/10.5194/bg-12-6443-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-12-6443-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 12, issue 21
Research article
 | 
11 Nov 2015
Research article |  | 11 Nov 2015

Speciation and distribution of P associated with Fe and Al oxides in aggregate-sized fraction of an arable soil

X. Jiang, R. Bol, S. Willbold, H. Vereecken, and E. Klumpp

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Short summary
Overall P content increased with decreasing size of soil aggregate-sized fractions. The relative distribution and speciation of varying P forms were independent of particle size. The majority of alkaline extractable P was in the amorphous Fe/Al oxide fraction, most of which was orthophosphate. Significant amounts of monoester P were also bound to these oxides. Residual P contained similar amounts of P occluded in amorphous and crystalline Fe oxides. This P may be released by FeO dissolution.
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