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@TECHREPORT{Kuhn:850112,
      author       = {Kuhn, Arnd Jürgen},
      title        = {{M}ikrosonden-{A}nalysen zur {I}onenaufnahme in {F}ichten
                      ({P}icea abies [{L}.] {K}arst.)},
      volume       = {2744},
      number       = {Juel-2744},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2018-04191, Juel-2744},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {204 p.},
      year         = {1993},
      abstract     = {The influence of several parameters on the nutrient supply
                      of trees in a forest ecosystem was object of the presented
                      work. Quantitative element analysis of bulk samples was
                      performed by use of inductively coupled plasma optical
                      emission spectroscopy (ICP-OES) and total-reflection X-ray
                      fluorescence spectrometry (TRFA). The main interest was
                      focused on the cellular level by analysing thin sections
                      using the laser-microprobe-mass-analyser (LAMMA) and the
                      energy-dispersive X-ray analyser (EDXA). The nutrient supply
                      was described in 90- to 120-year-old spruce (Picea abies [L
                      .] Karst.) growing in a forest decline stand and was
                      compared to a model-system of two- and three-year-old spruce
                      cultured in different soils. The investigations were focused
                      on: - the element content and the element distribution in
                      mycorrhized spruce roots in relation to soil depth and
                      damage class of the trees analysed - the comparison between
                      the relative element distribution in rnycorrhized roots and
                      in the shoot of spruce cultured in different soils. Stable
                      isotope labelling was performed under defined conditions
                      with spruce trees grown in soil and spruce seedlings from
                      sterile cultures to study the following points concerning
                      the physiological mechanisms of nutrient uptake have been of
                      main interest: - Ion-exchange capacity of mycorrhized roots
                      for Mg, K and Ca in relation to element-concentration, pH
                      and addition of Al - accessibility for Mg, K and Ca to
                      mycorrhized finest roots- temperature dependence of the
                      uptake kinetics for Mg, K and Ca - comparison of ion-uptake
                      in sterile and mycorrhized spruce seedlings - balance of
                      ion-uptake in spruce cultured in soil and the influence of
                      Al-addition. $\textbf{Nutrient status of old spruce and
                      spruce cultured in soli:}$ Two old spruce trees of differing
                      vitality(stand "POSTTURM"), forestry commission Farchau /
                      Ratzeburg ; damage class 0 and 3, respectively) were
                      analysed. Finest roots as well as the surrounding soil were
                      collected in 3 soil depths (0-10crn, 10-30cm, 30-50cm). The
                      element distribution within the mycorrhizas determined with
                      LAMMA and the element content of the mycorrhizas and of the
                      centrifuged soil solutions were measured by use of ICP-OES.
                      There were no clear correlations between element
                      distribution, element content of mycorrhizas and element
                      content of soil solutions. The Al content of mycorrhizas
                      rises with increasing soil depth. The element distribution
                      clearly shows higher Al contents in the cortex than in the
                      walls of the primary xylem. In all samples the Mg content is
                      clearly higher in the lumen of cortical cells than in the
                      corresponding cell walls. The distribution of Ca is reverse.
                      Mycorrhizas from trees of damage class 3 collected in
                      30-50cm soil-depth show lower element contents of Na, Mg, K
                      and Ca relative to those from trees of damage class 0 grown
                      in the same depth. The largest difference in the element
                      distribution in mycorrhizas from soil depth are manifested
                      as higher Na- and lower K-contents over the entire
                      cross-section and as lower Mg content in the lumina of
                      cortex cells at damage class O.},
      cin          = {PRE-2000},
      cid          = {I:(DE-Juel1)PRE2000-20140101},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)29},
      url          = {https://juser.fz-juelich.de/record/850112},
}