Articles | Volume 12, issue 21
Biogeosciences, 12, 6443–6452, 2015
Biogeosciences, 12, 6443–6452, 2015

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 et al.


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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.
Final-revised paper