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@ARTICLE{Jiang:828118,
      author       = {Jiang, Xiaoqian and Klumpp, Erwin and Cade-Menun, B. J. and
                      Bol, Roland and Nischwitz, Volker and Willbold, Sabine and
                      Vereecken, Harry and Bauke, S. L. and Amelung, Wulf},
      title        = {{C}olloid-bound and dissolved phosphorus species in topsoil
                      water extracts along a grassland transect from {C}ambisol to
                      {S}tagnosol},
      journal      = {Biogeosciences},
      volume       = {14},
      issn         = {1726-4170},
      address      = {Katlenburg-Lindau [u.a.]},
      publisher    = {Copernicus},
      reportid     = {FZJ-2017-02115},
      pages        = {1153-1164},
      year         = {2017},
      abstract     = {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.},
      cin          = {IBG-3 / ZEA-3},
      ddc          = {570},
      cid          = {I:(DE-Juel1)IBG-3-20101118 / I:(DE-Juel1)ZEA-3-20090406},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000396169300003},
      doi          = {10.5194/bg-14-1153-2017},
      url          = {https://juser.fz-juelich.de/record/828118},
}