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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Official URL: http://www.sciencedirect.com/science/article/pii/S...
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 | ||||||
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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 | ||||||
Copyright: | Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0 | ||||||
Full Text Status: | Public | ||||||
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: |
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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: | 09 Sep 2020 14:17 |
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