TY  - JOUR
AU  - Missong, Anna
AU  - Nischwitz, Volker
AU  - Bol, Roland
AU  - Siemens, Jan
AU  - Krüger, Jaane
AU  - Lang, Friederike
AU  - Klumpp, Erwin
TI  - Phosphorus in water dispersible-colloids of forest soil profiles
JO  - Plant and soil
VL  - 4227
IS  - 1-2
SN  - 0032-079X
CY  - Dordrecht [u.a.]
PB  - Springer Science + Business Media B.V
M1  - FZJ-2017-06968
SP  - 71-86
PY  - 2018
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000434056500006
DO  - DOI:10.1007/s11104-017-3430-7
UR  - https://juser.fz-juelich.de/record/838330
ER  -