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@ARTICLE{Uhlig:884256,
      author       = {Uhlig, D. and Amelung, W. and Blanckenburg, F.},
      title        = {{M}ineral nutrients sourced in deep regolith sustain
                      long‐term nutrition of mountainous temperate forest
                      ecosystems},
      journal      = {Global biogeochemical cycles},
      volume       = {34},
      number       = {9},
      issn         = {1944-9224},
      address      = {Hoboken, NJ},
      publisher    = {Wiley},
      reportid     = {FZJ-2020-03151},
      pages        = {1-21 e2019GB006513},
      year         = {2020},
      abstract     = {Primary productivity of forest ecosystems depends on the
                      availability of plant‐essential mineral nutrients. Because
                      nutrient demand of trees often exceeds nutrient supply from
                      rock, tree nutrition is sustained by efficient reutilization
                      of organic‐bound nutrients. These nutrients are
                      continuously returned from trees to the forest floor in
                      litterfall. However, over millennia nutrient limitation may
                      develop in landscapes from which nutrients are permanently
                      lost by drainage and erosion. Such a deficit is prevented if
                      advection of unweathered bedrock toward the surface as
                      driven by erosion continuously supplies fresh nutrients. Yet
                      the mechanisms and the depth range over which this deep
                      nutrient resource is accessed are poorly known. We show that
                      in two montane temperate forest ecosystems in the Black
                      Forest and Bavarian Forest the geogenic source of nutrients
                      was found within a depth zone of several meters. This deep
                      zone contains a large pool of biologically available
                      nutrients. We applied isotope ratios as proxies for nutrient
                      uptake depth, and we tracked the regolith depth at which the
                      isotope ratios of 87Sr/86Sr and 10Be(meteoric)/9Be match the
                      respective values in plant tissue. We mapped the depth
                      distribution of the biologically available calcium‐bound
                      form of the most plant‐essential mineral nutrient
                      phosphorus and found that the depth of phosphorus
                      availability is as deep or even deeper as the range defined
                      by the isotope ratios. We conclude that nutrient supply from
                      a regolith depth of several meters is critical for forest
                      ecosystem function in landscapes of moderate hillslopes and
                      rainfall that are affected by permanent nutrient loss.},
      cin          = {IBG-3},
      ddc          = {540},
      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:000576406900018},
      doi          = {10.1029/2019GB006513},
      url          = {https://juser.fz-juelich.de/record/884256},
}