Home About Browse Search
Svenska


Phosphorus dynamics in Swedish agricultural soils as influenced by fertilization and mineralogical properties: Insights gained from batch experiments and XANES spectroscopy

Eriksson, Ann Kristin and Hesterberg, Dean and Klysubun, Wantana and Gustafsson, Jon Petter (2016). Phosphorus dynamics in Swedish agricultural soils as influenced by fertilization and mineralogical properties: Insights gained from batch experiments and XANES spectroscopy. Science of the total environment. 566-567, 1410-1419
[Journal article]

[img] PDF - Accepted Version
Restricted to Repository staff only until 15 June 2018.
Available under License Creative Commons Attribution Non-commercial No Derivatives.

14MB

Official URL: http://www.sciencedirect.com/science/article/pii/S...

Abstract

The soil chemistry of phosphorus (P) is important for understanding the processes governing plant availability as well as the risk of environmental losses of P. The objective of this research was to investigate both the speciation and the pH-dependent solubility patterns of P in clayey agricultural soils in relation to soil mineralogy and fertilization history. The study focused on soil samples from six fields that were subjected to different P fertilization regimes for periods of 45 to 57 years. Soil P speciation was analyzed by P K-edge XANES spectroscopy and chemical fractionation, sorption isotherms were constructed, and dissolved P was measured as a function of pH. The XANES fitting results showed that organic P and P adsorbed to Fe and Al (hydr) oxides were common P constituents in all soils. Calciumphosphateswere identified in five of six soil samples. The XANES results also indicated an increase in P adsorbed to Al and to a lesser extent Fe (hydr) oxides as a result of fertilization. Moreover, the fluorescence intensity from the P K-edge XANES analysis was most strongly correlated with HCl-digestible P (r = 0.81***). Consistent with the XANES analysis, laboratory sorption isotherm models showed that the Freundlich sorption coefficient (K-F) was most closely related to oxalate-extractable Al. Greater proportions of Ca phosphate in two of the heavily fertilized soils in combination with enhanced PO4 solubilization upon sample acidification indicated neoformation of Ca-phosphate precipitates. The results for the unfertilized soil samples generally showed a minimum in dissolved PO4 between pH 6.5 and 7.5, with increases particularly at lower pH. This behavior can be explained either by the dissolution of Al-hydroxide-type sorbents or Ca phosphates at lower pH. In fertilized soils, there was no consistent trend in pH-dependent solubilization of P, with a complex relationship to solid-phase speciation. To conclude, inorganic P species changed most dynamically in agricultural clay soils over a period of several decades, and the role of pH in the solubilization of P depended mainly on P fertilization history and the content of reactive Ca phosphates. (C) 2016 Elsevier B.V. All rights reserved.

Authors/Creators:Eriksson, Ann Kristin and Hesterberg, Dean and Klysubun, Wantana and Gustafsson, Jon Petter
Title:Phosphorus dynamics in Swedish agricultural soils as influenced by fertilization and mineralogical properties: Insights gained from batch experiments and XANES spectroscopy
Series/Journal:Science of the total environment (0048-9697)
Year of publishing :2016
Volume:566-567
Page range:1410-1419
Number of Pages:10
Publisher:Elsevier
ISSN:0048-9697
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 > 405 Other Agricultural Sciences > Environmental Sciences related to Agriculture and Land-use
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Geochemistry
Agrovoc terms:soil analysis, soil chemistry
Keywords:XANES spectroscopy, Phosphorus, Phosphate, Apatite, Secondary iron and aluminium (hydr)oxides, Clay mineralogy
URN:NBN:urn:nbn:se:slu:epsilon-e-3644
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3644
Additional ID:
Type of IDID
Web of Science (WoS)000381060900136
DOI10.1016/j.scitotenv.2016.05.225
ID Code:13638
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 09:16
Metadata Last Modified:06 Sep 2016 09:16

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits