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Phosphorus abundance and speciation in acid forest Podzols - Effect of postglacial weathering

Tuyishime, Marius and Adediran, Gbotemi and Olsson, Bengt and Spohn, Marie and Hillier, Stephen and Klysubun, Wantana and Gustafsson, Jon Petter (2022). Phosphorus abundance and speciation in acid forest Podzols - Effect of postglacial weathering. Geoderma. 406 , 115500
[Research article]

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Abstract

The molecular speciation of phosphorus (P) in forest soils is of strategic importance for sustainable forest management. However, only limited information exists about soil P speciation in boreal forests. We combined P K-edge XANES spectroscopy, wet chemical P extractions, and X-ray diffraction analysis of soil minerals to investigate the vertical distribution of P species in seven podzolised forest soils differing in soil properties and climatic conditions. The results showed that the total P stock was on average, 4.0 g m(-2) in the Oe horizon, 9.5 g m(-2) in the A and E horizons, and substantially higher (117.5 g m(-2), and 109.3 g m(-2)) in the B and C horizons down to 80 cm depth, respectively. Although the Oe horizons contain a minor total P stock, 87% of it was stored as organic P. The composition of P species in the P-depleted A/E horizons was highly variable depending on the site. However, of the P stored in B and C horizons down to 80 cm, 58% was adsorbed P, mostly to Al, while apatite accounted for 25% of P, most of which was found in the C horizons. The apatite stocks in the A/E, B, and C horizons (down to 80 cm) accounted for 2.5%, 20%, and 77.2%, respectively, of the total apatite for all the mineral soils studied. These figures can be explained, first, by the dissolution of primary mineral apatite caused mainly by acidification. Second, P uptake by plants and microorganisms, and the associated formation of the Oe horizons, led to the formation of soil organic P. Further, the formation of organo-metal complexes and podzolization led to the translocation of P to the B horizons, where P accumulated mostly as P adsorbed to imogolite-type materials (e.g. allophane) and ferrihydrite, as shown by P K-edge XANES spectroscopy. In conclusion, this study shows that despite the young age of these soils (<15,000 years), most of the primary mineral apatite in the upper 30 cm has been transformed into organic P, and Fe-, Al-bound PO 4 . Moreover, the subsoil P, mainly consisting of adsorbed P to Al, and apatite, dominates the P inventory and probably serves as a long-term buffer of P.

Authors/Creators:Tuyishime, Marius and Adediran, Gbotemi and Olsson, Bengt and Spohn, Marie and Hillier, Stephen and Klysubun, Wantana and Gustafsson, Jon Petter
Title:Phosphorus abundance and speciation in acid forest Podzols - Effect of postglacial weathering
Series Name/Journal:Geoderma
Year of publishing :2022
Volume:406
Article number:115500
Number of Pages:13
Publisher:ELSEVIER
ISSN:0016-7061
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:P speciation, P stocks, Apatite weathering, Podzolization, P K-edge XANES spectroscopy
URN:NBN:urn:nbn:se:slu:epsilon-p-114027
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-114027
Additional ID:
Type of IDID
DOI10.1016/j.geoderma.2021.115500
Web of Science (WoS)000703716800019
ID Code:25879
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment

(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:20 Oct 2021 08:25
Metadata Last Modified:20 Oct 2021 08:31

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