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@ARTICLE{Rodionov:885562,
      author       = {Rodionov, Andrei and Bauke, Sara L. and von Sperber,
                      Christian and Hoeschen, Carmen and Kandeler, Ellen and
                      Kruse, Jens and Lewandowski, Hans and Marhan, Sven and
                      Mueller, Carsten W. and Simon, Margaux and Tamburini,
                      Federica and Uhlig, David and von Blanckenburg, Friedhelm
                      and Lang, Friederike and Amelung, Wulf},
      title        = {{B}iogeochemical cycling of phosphorus in subsoils of
                      temperate forest ecosystems},
      journal      = {Biogeochemistry},
      volume       = {150},
      number       = {3},
      issn         = {1573-515X},
      address      = {Dordrecht [u.a.]},
      publisher    = {Springer Science + Business Media B.V.},
      reportid     = {FZJ-2020-03933},
      pages        = {313 - 328},
      year         = {2020},
      abstract     = {Tree roots penetrate the soil to several meters depth, but
                      the role of subsoils for the supply of nutrient elements
                      such as phosphorus (P) to the trees is poorly understood.
                      Here, we tested the hypothesis that increased P deficiency
                      in the topsoil results in an increased microbial recycling
                      of P from the forest subsoil. We sampled soils from four
                      German temperate forest sites representing a gradient in
                      total P stocks. We analyzed the oxygen isotopic composition
                      of HCl-extractable phosphate (δ18OP) and identified
                      differences in P speciation with increasing soil depth using
                      X-ray absorption near-edge structure (XANES) spectroscopy.
                      We further determined microbial oxygen demand with and
                      without nutrient supply at different soil depths to analyse
                      nutrient limitation of microbial growth and used nanoscale
                      secondary ion mass spectrometry (NanoSIMS) to visualize
                      spatial P gradients in the rhizosphere. We found that δ18OP
                      values in the topsoil of all sites were close to the
                      isotopic signal imparted by biological cycling when oxygen
                      isotopes in phosphate are exchanged by enzymatic activity.
                      However, with increasing soil depth and increasing HCl-P
                      concentrations, δ18Ο values continuously decreased towards
                      values expected for primary minerals in parent material at
                      depths below 60 cm at sites with high subsoil P stocks and
                      below more than 2 m at sites with low subsoil P stocks,
                      respectively. For these depths, XANES spectra also indicated
                      the presence of apatite. NanoSIMS images showed an
                      enrichment of P in the rhizosphere in the topsoil of a site
                      with high P stocks, while this P enrichment was absent at a
                      site with low P stocks and in both subsoils. Addition of C,
                      N and P alone or in combination revealed that microbial
                      activity in subsoils of sites with low P stocks was mostly P
                      limited, whereas sites with high P stocks indicated N
                      limitation or N and P co-limitation. We conclude that
                      subsoil P resources are recycled by trees and soil
                      microorganisms. With continued weathering of the bedrock and
                      mobilisation of P from the weathered rocks, P cycling will
                      proceed to greater depths, especially at sites characterised
                      by P limitation.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000574343500001},
      doi          = {10.1007/s10533-020-00700-8},
      url          = {https://juser.fz-juelich.de/record/885562},
}