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Phosphorus (P) species in colloidal and <q>dissolved</q> soil fractions may havedifferent distributions. To understand which P species are potentiallyinvolved, we obtained water extracts from the surface soils of a gradientfrom Cambisol, Stagnic Cambisol to Stagnosol from temperate grassland inGermany. These were filtered to  <  450 nm, and divided into threeprocedurally defined fractions: small-sized colloids (20–450 nm),nano-sized colloids (1–20 nm), and <q>dissolved P</q> (<  1 nm), usingasymmetric flow field-flow fractionation (AF4), as well as filtration forsolution 31P-nuclear magnetic resonance (NMR) spectroscopy. The total P of soil water extractsincreased in the order Cambisol  <  Stagnic Cambisol  <  Stagnosol due toincreasing contributions from the dissolved P fraction. Associations ofC–Fe/Al–PO43−/pyrophosphate were absent in nano-sized (1–20 nm)colloids from the Cambisol but not in the Stagnosol. The 31P-NMR resultsindicated that this was accompanied by elevated portions of organic P in theorder Cambisol  >  Stagnic Cambisol  >  Stagnosol. Across all soil types,elevated proportions of inositol hexakisphosphate (IHP) species (e.g.,myo-, scyllo- and D-chiro-IHP) were associatedwith soil mineral particles (i.e., bulk soil and small-sized soil colloids),whereas other orthophosphate monoesters and phosphonates were found in the<q>dissolved</q> P fraction. We conclude that P species composition varies amongcolloidal and <q>dissolved</q> soil fractions after characterization usingadvanced techniques, i.e., AF4 and NMR. Furthermore, stagnic properties affectP speciation and availability by potentially releasing dissolved inorganicand ester-bound P forms as well as nano-sized organic matter–Fe/Al–Pcolloids

Colloid-bound and dissolved phosphorus species in topsoil water extracts along a grassland transect from Cambisol to Stagnosol