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Phosphorus speciati...
Phosphorus speciation in cultivated organic soils revealed by P K-edge XANES spectroscopy
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- Schmieder, Frank (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
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- Gustafsson, Jon Petter, 1964- (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,KTH,Vatten- och miljöteknik,Swedish Univ Agr Sci, Dept Soil & Environm, POB 7014, SE-75007 Uppsala, Sweden.,Institutionen för mark och miljö,Department of Soil and Environment
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- Klysubun, Wantana (författare)
- Synchrotron Light Res Inst SLRI, 111 Univ Ave, Muang Dist 30000, Nakhon Ratchasi, Thailand.
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- Zehetner, Franz (författare)
- Univ Nat Resources & Life Sci, Inst Soil Res, Dept Forest & Soil Sci, Peter Jordan Str 82, Vienna 1190, Austria.
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- Riddle, Matthew (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
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- Kirchmann, Holger (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
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- Bergström, Lars (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
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(creator_code:org_t)
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- 2020-05-07
- 2020
- Engelska.
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Ingår i: Journal of Plant Nutrition And Soil Science/Zeitschrift für Pflanzenernahrung und Bodenkunde. - : Wiley. - 1436-8730 .- 1522-2624. ; 183:3, s. 367-381
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https://onlinelibrar...
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https://pub.epsilon.... (primary) (Raw object) (free)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
Nyckelord
- Histosol
- organic phosphorus
- phosphorus saturation
- soil aluminium
- soil iron
- X-ray absorption spectroscopy
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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