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@ARTICLE{Moschen:3790,
      author       = {Moschen, R. and Kühl, N. and Rehberger, I. and Lücke, A.},
      title        = {{S}table carbon and oxygen isotopes in sub-fossil
                      {S}phagnum: {A}ssessment of their applicability for
                      palaeoclimatology},
      journal      = {Chemical geology},
      volume       = {259},
      issn         = {0009-2541},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {PreJuSER-3790},
      year         = {2009},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {To investigate the potential of stable isotopes of Sphagnum
                      peat deposits for palaeoclimate research and to inform
                      sampling strategies, we present results from a study of
                      selected Sphagnum plant constituents. We report a combined
                      stable carbon and oxygen isotope record of cellulose
                      separately extracted from Sphagnum branches and stem
                      sections manually sampled from a similar to 4000 year old
                      peat, deposited in a small dry maar crater located in the
                      Westeifel Volcanic Field, Germany. We have determined the
                      species composition of each individual sample of Sphagnum
                      branches to address the sensitivity of the stable isotope
                      records to potential changes in Sphagnum assemblages. The
                      youngest approximately 3000 years old peat section consists
                      of scarcely decomposed Sphagnum plant material. From the
                      bog's surface to a depth of similar to 60 cm the predominant
                      species is Sphagnum magellanicum. Between similar to 60 and
                      similar to 550 cm the peat predominantly consists of
                      Sphagnum capillifolium var. rubellum. At greater depths the
                      decomposition status increases, species identification is,
                      however, solely achievable if the record under examination
                      consists of moderately decomposed peat. The stable carbon
                      and oxygen isotope values of cellulose from Sphagnum stem
                      sections are significantly lighter than those of the
                      branches. Both isotopic offsets between the different plant
                      compounds exhibit a strong degree of correlation, are
                      statistically highly significant and observable down-core.
                      The stable carbon isotope offset averages to 1.5 parts per
                      thousand, however, presumably decreases with increasing age
                      of the plant material. In contrast, the averaged oxygen
                      isotope offset of 0.9 parts per thousand is consistent in
                      time. Our results imply that if no differentiation into
                      Sphagnum branches and stem sections prior to stable isotope
                      analyses is possible, erroneous interpretations of the
                      isotope records are likely, since down-core changes in the
                      ratio of branches to stem sections in the peat profile are
                      most likely. This also implies that the removal of all
                      non-Sphagnum plants or plant fragments is insufficient to
                      retrieve stable isotope signals from peat deposits
                      exclusively reflecting palaeo-environmental conditions. Even
                      isotopic records from bulk Sphagnum cellulose comprise of
                      two different signals: firstly, an environmental signal
                      based on the plant response to external controls. This
                      signal is, however, masked by a second plant physiological
                      signal originating from the isotopic offset between branches
                      and stem sections. (C) 2008 Elsevier B.V. All rights
                      reserved.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB793},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Geochemistry $\&$ Geophysics},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000264060000015},
      doi          = {10.1016/j.chemgeo.2008.11.009},
      url          = {https://juser.fz-juelich.de/record/3790},
}