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 | ||||||
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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: |
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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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