Evolution of phosphorus speciation with depth in an agricultural soil profile

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Evolution of phosphorus speciation with depth in an agricultural soil profile

Eriksson, Ann Kristin (author): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment

Hillier, Stephen (author): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment,The James Hutton Institute

Hesterberg, Dean (author)

Klysubun, Wantana (author)

Ulen, Barbro (author): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment

Gustafsson, Jon Petter (author): Sveriges lantbruksuniversitet,KTH,Mark- och vattenteknik,Swedish University of Agricultural Sciences, Sweden,Institutionen för mark och miljö,Department of Soil and Environment,Royal Institute of Technology (KTH)

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Elsevier, 2016
2016
English.
In: Geoderma. - : Elsevier. - 0016-7061 .- 1872-6259. ; 280, s. 29-37

Related links:: https://kth.diva-por... (primary) (Raw object); show more...; http://kth.diva-port...; https://pub.epsilon.... (primary) (Raw object) (free); https://urn.kb.se/re...; https://doi.org/10.1...; https://res.slu.se/i...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

With time, different soil-forming processes such as weathering, plant growth, accumulation of organic matter, and cultivation are likely to affect phosphorus (P) speciation. In this study, the depth distribution of P species was investigated for an agricultural clay soil, Lanna, Sweden. Small amounts of apatite-P was demonstrated in the topsoil whereas the speciation of Pat 70-100 cm depth consisted of approximately 86% apatite according to P K-edge XANES (X-ray absorption near-edge structure) spectroscopy. Because there were only minor differences in bulk mineralogy and texture, these variations in P speciation were interpreted as the result of apatite weathering of the topsoil. Speciation modeling on soil extracts supported this idea: hydroxyapatite was not thermodynamically stable in the top 50 cm of the soil. Apatite was enriched in the bulk soil relative to the clay fraction, as expected during apatite dissolution. Combined results from batch experiments, XANES spectroscopy and X-ray diffraction suggested chemical transformations of the topsoil as a result from accumulation of organic matter and airing from tillage followed by enhanced weathering of apatite, amphiboles, clay minerals, and iron oxides. This caused the formation of poorly crystalline secondary iron and aluminum (hydr)oxides in the topsoil, which retained part of the released P from apatite. Other P was incorporated into organic forms. Furthermore, the results also showed that short-term acidification below the current pH value (below 5.5 in the topsoil and 7.2 in the deeper subsoil) caused significant solubilization of P. This is attributed to two different mechanisms: the instability of Al-containing sorbents (e.g. Al hydroxides) at low pH (in the topsoil), and the acid-mediated dissolution of apatite (the subsoil).

Subject headings

LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)

Keyword

Acidification
Apatite
Clay
Secondary iron and aluminum (hydr)oxides
X-ray adsorption spectroscopy
Land and Water Resources Engineering
Mark- och vattenteknik

Publication and Content Type

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art (subject category)

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By the author/editor: Eriksson, Ann Kr ...; Hillier, Stephen; Hesterberg, Dean; Klysubun, Wantan ...; Ulen, Barbro; Gustafsson, Jon ...

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AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Agriculture Fore ...; and Soil Science

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Geochemistry

Articles in the publication: Geoderma

By the university: Royal Institute of Technology; Swedish University of Agricultural Sciences

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