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Phosphorus speciation of clay fractions from long-term fertility experiments in Sweden
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. Swedish University of Agricultural Sciences, Sweden.ORCID iD: 0000-0001-8771-7941
2015 (English)In: Geoderma, ISSN 0016-7061, E-ISSN 1872-6259, Vol. 241, 68-74 p.Article in journal (Refereed) Published
Abstract [en]

Phosphorus (P) losses from agricultural soils constitute a main driver for eutrophication of the Baltic Sea. There is limited knowledge about sorption and release processes of P in these soils, especially concerning the effects of fertilization. In this study, P speciation of the clay fractions from six different soils in long-term fertility experiments in Sweden was investigated by P K-edge XANES spectroscopy. As expected, unfertilized soils had lower concentrations of acid-digestible P compared with fertilized soils. Based on best-fit standards that emerged from linear combination fitting (LCF) of XANES spectra, phosphate sorbed on iron (Fe) (hydr)oxides was a dominant P species in clay fractions from unfertilized soils containing more than 35 mmol kg(-1) of oxalate-extractable Fe. In contrast, P sorbed on aluminum (Al) (hydr)oxides predominated in soils with lower concentrations of oxalate-extractable Fe. A greater proportion of organically bound P was fit for soil samples containing >2% organic carbon. The soils included one calcareous soil for which a greater proportion of P was fit as apatite. After long-term fertilization, P had accumulated mainly as P adsorbed to Al (hydr) oxides according to the XANES analysis. Our research shows that P speciation in fertilized agricultural soils depended on the level of P buildup and on the soil properties.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 241, 68-74 p.
Keyword [en]
Soils, X-ray absorption spectroscopy, Sweden, Phosphorus, Phosphate, Clays
National Category
Soil Science
URN: urn:nbn:se:kth:diva-160733DOI: 10.1016/j.geoderma.2014.10.023ISI: 000348083700008ScopusID: 2-s2.0-84919934924OAI: diva2:792102
Swedish Research Council Formas, 2010-1677

QC 20150303

Available from: 2015-03-03 Created: 2015-02-27 Last updated: 2016-03-01Bibliographically approved

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