Jiang, Xiaoqian
[Author];
Klumpp, Erwin
[Author];
Cade-Menun, Barbara J.
[Author];
Bol, Roland
[Author];
Nischwitz, Volker
[Author];
Willbold, Sabine
[Author];
Vereecken, Harry
[Author];
Bauke, Sara L.
[Author];
Amelung, Wulf
[Author]
Colloid-bound and dissolved phosphorus species in topsoil water extracts along a grassland transect from Cambisol to Stagnosol
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Media type:
Computer Dataset
Title:
Colloid-bound and dissolved phosphorus species in topsoil water extracts along a grassland transect from Cambisol to Stagnosol
Contributor:
Jiang, Xiaoqian
[Author];
Klumpp, Erwin
[Author];
Cade-Menun, Barbara J.
[Author];
Bol, Roland
[Author];
Nischwitz, Volker
[Author];
Willbold, Sabine
[Author];
Vereecken, Harry
[Author];
Bauke, Sara L.
[Author];
Amelung, Wulf
[Author]
Footnote:
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Description:
Phosphorus (P) species in colloidal and “dissolved” soil fractions may have different distributions. To understand which P species are potentially involved, we obtained water extracts from the surface soils of a gradient 5 from Cambisol, Stagnic Cambisol to Stagnosol from temperate grassland in Germany. These were filtered to <450 nm, and divided into three procedurally defined fractions: small-sized colloids (20–450 nm), nano-sized colloids (1–20 nm), and “dissolved P” (<1 nm), using asymmetric flow 10 field-flow fractionation (AF4), as well as filtration for solution 31P-nuclear magnetic resonance (NMR) spectroscopy. The total P of soil water extracts increased in the order Cambisol Stagnic Cambisol>Stagnosol. Across all 20 soil types, elevated proportions of inositol hexakisphosphate (IHP) species (e.g., myo-, scyllo- and D-chiro-IHP) were associated with soil mineral particles (i.e., bulk soil and small-sized soil colloids), whereas other orthophosphate monoesters and phosphonates were found in the “dissolved” 25 P fraction. We conclude that P species composition varies among colloidal and “dissolved” soil fractions after characterization using advanced techniques, i.e., AF4 and NMR. Furthermore, stagnic properties affect P speciation and availability by potentially releasing dissolved inorganic and esterbound P forms as well as nano-sized organic matter–Fe/Al–P 30 colloids.