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Evolution of phosphorus speciation with depth in an agricultural soil profile

Eriksson, Ann Kristin and Hillier, Stephen and Hesterberg, Dean and Klysubun, Wantana and Ulén, Barbro and Gustafsson, Jon Petter (2016). Evolution of phosphorus speciation with depth in an agricultural soil profile. Geoderma. 280, 29-37
[Journal article]

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Abstract

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). (C) 2016 Elsevier B.V. All rights reserved.

Authors/Creators:Eriksson, Ann Kristin and Hillier, Stephen and Hesterberg, Dean and Klysubun, Wantana and Ulén, Barbro and Gustafsson, Jon Petter
Title:Evolution of phosphorus speciation with depth in an agricultural soil profile
Series/Journal:Geoderma (0016-7061)
Year of publishing :2016
Volume:280
Page range:29-37
Number of Pages:9
Publisher:Elsevier
ISSN:0016-7061
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Restricted
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Geochemistry
Agrovoc terms:soil analysis, soil chemistry
Keywords:Acidification, Apatite, Clay, Secondary iron and aluminum (hydr)oxides, X-ray adsorption spectroscopy
URN:NBN:urn:nbn:se:slu:epsilon-e-3645
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3645
Additional ID:
Type of IDID
Web of Science (WoS)000380626700005
DOI10.1016/j.geoderma.2016.06.004
ID Code:13639
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:06 Sep 2016 09:38
Metadata Last Modified:06 Sep 2016 09:38

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