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001     838330
005     20220930130133.0
024 7 _ |a 10.1007/s11104-017-3430-7
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037 _ _ |a FZJ-2017-06968
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100 1 _ |a Missong, Anna
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245 _ _ |a Phosphorus in water dispersible-colloids of forest soil profiles
260 _ _ |a Dordrecht [u.a.]
|c 2018
|b Springer Science + Business Media B.V
336 7 _ |a article
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520 _ _ |a Background and aimsNanoparticles and colloids affect the mobilisation and availability of phosphorus for plants and microorganisms in soils. We aimed to give a description of colloid sizes and composition from forest soil profiles and to evaluate the size-related quality of colloids for P fixation.MethodsWe investigated the size-dependent elemental composition and the P content of water-dispersible colloids (WDC) isolated from five German (beech-dominated) forest soil profiles of varying bulk soil P content by field-flow fractionation (FFF) coupled to various detectors.ResultsThree size fractions of WDC were separated: (i) nanoparticles <25 nm (NP) rich in Corg, (ii) fine colloids (25 nm–240 nm; FC) composed mainly of Corg, Fe and Al, probably as associations of Fe- and Al- (hydr)oxides and organic matter, and (iii) medium-sized colloids (240 nm–500 nm; MC), rich in Fe, Al and Si, indicating the presence of phyllosilicates. The P concentration in the overall WDC was up to 16 times higher compared to the bulk soil. The NP content decreased with increasing soil depth while the FC and MC showed a local maximum in the mineral topsoil due to soil acidification, although variant distributions in the subsoil were observed. NP were of great relevance for P binding in the organic surface layers, whereas FC- and MC-associated P dominated in the Ah horizon.ConclusionThe nanoparticles and colloids appeared to be of high relevance as P carriers in the forest surface soils studied, regardless of the bulk soil P content.
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700 1 _ |a Nischwitz, Volker
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700 1 _ |a Bol, Roland
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700 1 _ |a Siemens, Jan
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700 1 _ |a Krüger, Jaane
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700 1 _ |a Lang, Friederike
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700 1 _ |a Klumpp, Erwin
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773 _ _ |a 10.1007/s11104-017-3430-7
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