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@ARTICLE{Konrad:890527,
      author       = {Konrad, Alexander and Billiy, Benjamin and Regenbogen,
                      Philipp and Bol, Roland and Lang, Friederike and Klumpp,
                      Erwin and Siemens, Jan},
      title        = {{F}orest {S}oil {C}olloids {E}nhance {D}elivery of
                      {P}hosphorus {I}nto a {D}iffusive {G}radient in {T}hin
                      {F}ilms ({DGT}) {S}ink},
      journal      = {Frontiers in forests and global change},
      volume       = {3},
      issn         = {2624-893X},
      address      = {Lausanne},
      publisher    = {Frontiers Media},
      reportid     = {FZJ-2021-01014},
      pages        = {577364},
      year         = {2021},
      abstract     = {Phosphorus (P) is preferentially bound to colloids in soil.
                      On the one hand, colloids may facilitate soil P leaching
                      leading to a decrease of plant available P, but on the other
                      hand they can carry P to plant roots, thus supporting the P
                      uptake of plants. We tested the magnitude and the kinetics
                      of P delivery by colloids into a P sink mimicking plant
                      roots using the Diffusive Gradients in Thin-Films (DGT)
                      technique. Colloids were extracted with water from three
                      forest soils differing in parent material using a method
                      based on dispersion and sedimentation. Freeze-dried
                      colloids, the respective bulk soil, and the colloid-free
                      extraction residue were sterilized and mixed with quartz
                      sand and silt to an equal P basis. The mixtures were wetted
                      and the diffusive fluxes of P into the DGTs were measured
                      under sterile, water unsaturated conditions. The colloids
                      extracted from a P-poor sandy podzolic soil were highly
                      enriched in iron and organic matter compared to the bulk
                      soil and delivered more P at a higher rate into the sink
                      compared to bulk soil and the colloid-free soil extraction
                      residue. However, colloidal P delivery into the sink was
                      smaller than P release and transport from the bulk soil
                      developed on dolomite rock, and with no difference for a
                      soil with intermediate phosphorus-stocks developed from
                      gneiss. Our results provide evidence that both the mobility
                      of colloids and their P binding strength control their
                      contribution to the plant available P-pool of soils.
                      Overall, our findings highlight the relevance of colloids
                      for P delivery to plant roots.},
      cin          = {IBG-3},
      ddc          = {630},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {217 - Für eine nachhaltige Bio-Ökonomie – von
                      Ressourcen zu Produkten (POF4-217)},
      pid          = {G:(DE-HGF)POF4-217},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000614091500001},
      doi          = {10.3389/ffgc.2020.577364},
      url          = {https://juser.fz-juelich.de/record/890527},
}