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@ARTICLE{Uhlig:864344,
      author       = {Uhlig, David and von Blanckenburg, Friedhelm},
      title        = {{H}ow {S}low {R}ock {W}eathering {B}alances {N}utrient
                      {L}oss {D}uring {F}ast {F}orest {F}loor {T}urnover in
                      {M}ontane, {T}emperate {F}orest {E}cosystems},
      journal      = {Frontiers in Earth Science},
      volume       = {7},
      issn         = {2296-6463},
      address      = {Lausanne},
      publisher    = {Frontiers Media},
      reportid     = {FZJ-2019-04140},
      pages        = {159},
      year         = {2019},
      abstract     = {Mineral nutrient cycling between trees and the forest floor
                      is key to forest ecosystem nutrition. However, in sloping,
                      well-drained landscapes the forest floor experiences
                      permanent nutrient loss in particulate form by plant litter
                      erosion and as solute after plant litter decomposition,
                      solubilisation, and export. To prevent nutrient deficit, a
                      replenishing mechanism must be in operation that we suggest
                      to be sourced in the subsoil and the weathering zone beneath
                      it, provided that atmospheric input is insufficient. To
                      explore such a mechanism, we quantified deep (up to 20 m
                      depth) weathering and mineral nutrient cycling in two
                      montane, temperate forest ecosystems in Southern Germany:
                      Black Forest (CON) and Bavarian Forest (MIT). From
                      measurements of the inventories, turnover times, and fluxes
                      of macronutrients (K, Ca, Mg, P) we found evidence for a
                      fast, shallow “organic nutrient cycle”, and a slow, deep
                      “geogenic nutrient pathway”. We found that the finite
                      nutrient pool size of the forest floor persists for a few
                      years only. Despite this loss, foliar nutrient
                      concentrations in Picea abies and Fagus sylvatica do not
                      indicate deficiency. We infer that ultimately the
                      biologically available fraction in the deep regolith (CON:
                      3–7 m, MIT: 3–17 m) balances nutrient loss from the
                      forest floor and is also decisive for the level of the
                      forest trees' mineral nutrient stoichiometry. Intriguingly,
                      although the nutrient supply fluxes from chemical weathering
                      at CON are twice those of MIT, nutrient uptake fluxes into
                      trees do not differ. The organic nutrient cycle apparently
                      regulates the efficiency of nutrient re-utilization from
                      organic matter to cater for differences in its replenishment
                      by the deep geogenic nutrient pathway, and thereby ensures
                      long-term forest ecosystem nutrition.},
      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:000475976200001},
      doi          = {10.3389/feart.2019.00159},
      url          = {https://juser.fz-juelich.de/record/864344},
}