Home > Publications database > Colloid-bound and dissolved phosphorus species in topsoil water extracts along a grassland transect from Cambisol to Stagnosol > print

001     828118
005     20220930130118.0
024 7 _ |a 10.5194/bg-14-1153-2017
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041 _ _ |a English
082 _ _ |a 570
100 1 _ |a Jiang, Xiaoqian
|0 P:(DE-Juel1)156268
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245 _ _ |a Colloid-bound and dissolved phosphorus species in topsoil water extracts along a grassland transect from Cambisol to Stagnosol
260 _ _ |a Katlenburg-Lindau [u.a.]
|c 2017
|b Copernicus
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520 _ _ |a 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 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 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 due to increasing contributions from the dissolved P fraction. Associations of C–Fe/Al–PO43−/pyrophosphate were absent in nano-sized (1–20 nm) colloids from the Cambisol but not in the Stagnosol. The 31P-NMR results indicated that this was accompanied by elevated portions of organic P in the order Cambisol  >  Stagnic Cambisol  >  Stagnosol. Across all 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" 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 ester-bound P forms as well as nano-sized organic matter–Fe/Al–P colloids.
536 _ _ |a 255 - Terrestrial Systems: From Observation to Prediction (POF3-255)
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700 1 _ |a Klumpp, Erwin
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700 1 _ |a Cade-Menun, B. J.
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700 1 _ |a Bol, Roland
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700 1 _ |a Nischwitz, Volker
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700 1 _ |a Willbold, Sabine
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700 1 _ |a Vereecken, Harry
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700 1 _ |a Bauke, S. L.
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700 1 _ |a Amelung, Wulf
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773 _ _ |a 10.5194/bg-14-1153-2017
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