Schmieder, Frank and Gustafsson, Jon-Petter and Klysubun, Wantana and Zehetner, Franz and Riddle, Matthew and Kirchmann, Holger and Bergström, Lars
(2020).
Phosphorus speciation in cultivated organic soils revealed by P K-edge XANES spectroscopy.
Journal of Plant Nutrition and Soil Science. 183
, 367-381
[Journal article]
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Abstract
Cultivated organic soils make a significant contribution to phosphorus (P) leaching losses from agricultural land, despite occupying a small proportion of cultivated area. However, less is known about P mobilisation processes and the P forms present in peat soils compared with mineral soils. In this study, P forms and their distribution with depth were investigated in two cultivated Histosol profiles, using a combination of wet chemical extraction and P K-edge X-ray absorption near-edge structure (XANES) spectroscopy.Both profiles had elevated P content in the topsoil, amounting to around 40 mmol kg(-1), and P speciation in both profiles was strongly dominated by organic P. Topsoils were particularly rich in organic P (P-org), with relative proportions of up to 80%. Inorganic P in the profiles was almost exclusively adsorbed to surface reactive aluminium (Al) and iron (Fe) minerals. In one of the pro-files, small contributions of Ca-phosphates were detected.A commonly used P saturation index (PSI) based on ammonium-oxalate extraction indicated a low to moderate risk of P leaching from both profiles. However, the capacity of soil Al and Fe to retain P in organic soils could be reduced by high competition from organic compounds for sorption sites. This is not directly accounted for in PSI and similar indices.Accumulation of P-org in the topsoil may be attributable by microbial peat decomposition and transformation of mineral fertiliser P by both microbiota and crops. Moreover, high carbon-phosphorus ratio in the surface peat material in both profiles suggests reduced net mineralisation of P-org in the two soils. However, advancing microbial peat decomposition will eventually lead to complete loss of peat horizons and to mineralisation of P-org. Hence, P-org in both profiles represents a huge potentially mobilised P pool.
Authors/Creators: | Schmieder, Frank and Gustafsson, Jon-Petter and Klysubun, Wantana and Zehetner, Franz and Riddle, Matthew and Kirchmann, Holger and Bergström, Lars | ||||||
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Title: | Phosphorus speciation in cultivated organic soils revealed by P K-edge XANES spectroscopy | ||||||
Year of publishing : | 2020 | ||||||
Volume: | 183 | ||||||
Page range: | 367-381 | ||||||
Number of Pages: | 15 | ||||||
Publisher: | Wiley-VCH Verlag GmbH & Co | ||||||
ISSN: | 1436-8730 | ||||||
Language: | English | ||||||
Publication Type: | Journal article | ||||||
Article category: | Scientific peer reviewed | ||||||
Version: | Published 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 | ||||||
Keywords: | Histosol, organic phosphorus, phosphorus saturation, soil aluminium, soil iron, X-ray absorption spectroscopy | ||||||
URN:NBN: | urn:nbn:se:slu:epsilon-p-105698 | ||||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-105698 | ||||||
Additional ID: |
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ID Code: | 17253 | ||||||
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: | 18 Aug 2020 06:36 | ||||||
Metadata Last Modified: | 15 Jan 2021 19:45 |
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