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Phosphorus speciation of clay fractions from long-term fertility experiments in Sweden

Eriksson, Ann Kristin and Gustafsson (forward), Jon Petter and Hesterberg, Dean (2015). Phosphorus speciation of clay fractions from long-term fertility experiments in Sweden. Geoderma. 241-242, 68-74
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Abstract

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. (C) 2014 Elsevier B.V. All rights reserved.

Authors/Creators:Eriksson, Ann Kristin and Gustafsson (forward), Jon Petter and Hesterberg, Dean
Title:Phosphorus speciation of clay fractions from long-term fertility experiments in Sweden
Series/Journal:Geoderma (0016-7061)
Year of publishing :2015
Depositing date:25 June 2015
Volume:241-242
Page range:68-74
Number of Pages:7
Publisher:Elsevier
ISSN:0016-7061
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Agris subject categories.:F Plant production > F07 Soil cultivation
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Agrovoc terms:soil, X-ray spectroscopy, phosphorus
Keywords:Soils, X-ray absorption spectroscopy, Sweden, Phosphorus, Phosphate, Clays
URN:NBN:urn:nbn:se:slu:epsilon-e-2741
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2741
Additional ID:
Type of IDID
Web of Science (WoS)000348083700008
DOI10.1016/j.geoderma.2014.10.023
ID Code:12362
Faculty:S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:25 Jun 2015 11:59
Metadata Last Modified:13 Nov 2016 00:15

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