%0 Journal Article
%A Missong, Anna
%A Nischwitz, Volker
%A Bol, Roland
%A Siemens, Jan
%A Krüger, Jaane
%A Lang, Friederike
%A Klumpp, Erwin
%T Phosphorus in water dispersible-colloids of forest soil profiles
%J Plant and soil
%V 4227
%N 1-2
%@ 0032-079X
%C Dordrecht [u.a.]
%I Springer Science + Business Media B.V
%M FZJ-2017-06968
%P 71-86
%D 2018
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000434056500006
%R 10.1007/s11104-017-3430-7
%U https://juser.fz-juelich.de/record/838330