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Phosphorus in 2D :
Phosphorus in 2D : Spatially resolved P speciation in two Swedish forest soils as influenced by apatite weathering and podzolization
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- Adediran, Gbotemi A. (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
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- Tuyishime, J. R. Marius (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
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- Vantelon, Delphine (author)
- Synchrotron SOLEIL, St Aubin BP 48, F-91192 Gif Sur Yvette, France.
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- Klysubun, Wantana (author)
- Synchrotron Light Res Inst, 111 Moo 6, Muang, Nakhon Ratchasi, Thailand.
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- Gustafsson, Jon Petter, 1964- (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,KTH,Hållbar utveckling, miljövetenskap och teknik,Swedish Univ Agr Sci, Dept Soil & Environm, Box 7014, S-75007 Uppsala, Sweden.,Institutionen för mark och miljö,Department of Soil and Environment,Royal Institute of Technology (KTH)
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(creator_code:org_t)
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- Elsevier BV, 2020
- 2020
- English.
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In: Geoderma. - : Elsevier BV. - 0016-7061 .- 1872-6259. ; 376
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Abstract
Subject headings
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- The cycling and long-term supply of phosphorus (P) in soils are of global environmental and agricultural concern. To advance the knowledge, a detailed understanding of both the vertical and lateral variation of P chemical speciation and retention mechanism(s) is required, a knowledge that is limited in postglacial forest soils. We combined the use of synchrotron X-ray fluorescence microscopy with multi-elemental co-localisation analysis and P K-edge XANES spectroscopy to reveal critical chemical and structural soil properties. We established a two-dimensional (2D) imagery of P retention and speciation at a microscale spatial resolution in two forest soil profiles formed in glaciofluvial and wave-washed sand. The abundance and speciation of P in the upper 40 cm was found to be influenced by soil weathering and podzolization, leading to spatial variability in P speciation on the microscale (< 200 pm) with P existing predominantly as organic P and as PO4 adsorbed to allophane and ferrihydrite, according to XANES spectroscopy. These species were mostly retained at sharp edges and in pore spaces within Al and Si-bearing particles. Despite the relatively young age ( < 15,000 years) of the soils, our results show primary mineral apatite to have weathered from the surface horizons. In the C horizon however, a large fraction of the P was in the form of apatite, which appeared as widely dispersed ( > 600 pm) hot spots of inclusions in aluminosilicates or as discrete micro-sized apatite grains. The subsoil apatite represents a pool of P that trees can potentially acquire and thus add to the biogeochemically active P pool in temperate forest soils.
Subject headings
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries (hsv//eng)
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
Keyword
- Phosphorus retention and speciation
- Postglacial forest soils
- Apatite weathering
- Podzolization
- X-ray fluorescence microscopy and spectroscopy
Publication and Content Type
- ref (subject category)
- art (subject category)
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