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@ARTICLE{Thieme:862823,
      author       = {Thieme, Lisa and Graeber, Daniel and Hofmann, Diana and
                      Bischoff, Sebastian and Schwarz, Martin T. and Steffen,
                      Bernhard and Meyer, Ulf-Niklas and Kaupenjohann, Martin and
                      Wilcke, Wolfgang and Michalzik, Beate and Siemens, Jan},
      title        = {{D}issolved organic matter characteristics of deciduous and
                      coniferous forests with variable management: different at
                      the source, aligned in the soil},
      journal      = {Biogeosciences},
      volume       = {16},
      number       = {7},
      issn         = {1726-4189},
      address      = {Katlenburg-Lindau [u.a.]},
      publisher    = {Copernicus},
      reportid     = {FZJ-2019-03024},
      pages        = {1411 - 1432},
      year         = {2019},
      abstract     = {Dissolved organic matter (DOM) is part of thebiogeochemical
                      cycles of carbon and nutrients, carries pol-lutants and
                      drives soil formation. The DOM concentrationand properties
                      along the water flow path through forestecosystems depend on
                      its sampling location and transfor-mation processes. To
                      improve our understanding of the ef-fects of forest
                      management, especially tree species selec-tion and
                      management intensity, on DOM concentrations andproperties of
                      samples from different ecosystem fluxes, westudied
                      throughfall, stemflow, litter leachate and mineral
                      soilsolution at 26 forest sites in the three regions of the
                      Ger-man Biodiversity Exploratories. We covered forest
                      standswith three management categories (coniferous,
                      deciduousage class and unmanaged beech forests). In water
                      samplesfrom these forests, we monitored DOC concentrations
                      over 4years and characterized the quality of DOM with UV-vis
                      ab-sorption, fluorescence spectroscopy combined with
                      parallelfactor analysis (PARAFAC) and Fourier transform ion
                      cy-clotron resonance mass spectrometry (FT-ICR-MS).
                      Addi-tionally, we performed incubation-based biodegradation
                      as-says. Multivariate statistics revealed strong significant
                      ef-fects of ecosystem fluxes and smaller effects of main
                      treespecies on DOM quality. Coniferous forests differed
                      fromdeciduous forests by showing larger DOC
                      concentrations,more lignin- and protein-like molecules, and
                      fewer tannin-like molecules in throughfall, stemflow, and
                      litter leachate.Cluster analysis of FT-ICR-MS data indicated
                      that DOMcompositions, which varied in aboveground samples
                      depend-ing on tree species, become aligned in mineral soil.
                      Thisalignment of DOM composition along the water flow pathin
                      mineral soil is likely caused by microbial production
                      andconsumption of DOM in combination with its
                      interactionwith the solid phase, producing a characteristic
                      pattern of or-ganic compounds in forest mineral soils. We
                      found similarlypronounced effects of ecosystem fluxes on the
                      biodegradabil-ity of DOM, but surprisingly no differences
                      between deciduous and coniferous forests. Forest management
                      intensity,mainly determined by biomass extraction,
                      contribution ofspecies, which are not site-adapted, and
                      deadwood mass, didnot influence DOC concentrations, DOM
                      composition andproperties significantly.},
      cin          = {IBG-3 / JSC},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118 / I:(DE-Juel1)JSC-20090406},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255) / 511 - Computational Science and Mathematical
                      Methods (POF3-511)},
      pid          = {G:(DE-HGF)POF3-255 / G:(DE-HGF)POF3-511},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000463512200002},
      doi          = {10.5194/bg-16-1411-2019},
      url          = {https://juser.fz-juelich.de/record/862823},
}