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Phosphorus speciati...
Phosphorus speciation of clay fractions from long-term fertility experiments in Sweden
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- Eriksson, Ann Kristin (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
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- Gustafsson, Jon Petter (författare)
- Sveriges lantbruksuniversitet,KTH,Mark- och vattenteknik,Swedish University of Agricultural Sciences, Sweden,Institutionen för mark och miljö,Department of Soil and Environment
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Hesterberg, Dean (författare)
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(creator_code:org_t)
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- Elsevier, 2015
- 2015
- Engelska.
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Ingår i: Geoderma. - : Elsevier. - 0016-7061 .- 1872-6259. ; 241, s. 68-74
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
Nyckelord
- Soils
- X-ray absorption spectroscopy
- Sweden
- Phosphorus
- Phosphate
- Clays
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Geoderma
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