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@ARTICLE{Graf:362,
      author       = {Graf, A. and Weihermüller, L. and Huisman, J. A. and
                      Herbst, M. and Bauer, J. and Vereecken, H.},
      title        = {{M}easurement depth effects on the apparent temperature
                      sensitivity of soil respiration in field studies},
      journal      = {Biogeosciences},
      volume       = {5},
      issn         = {1726-4170},
      address      = {Katlenburg-Lindau [u.a.]},
      publisher    = {Copernicus},
      reportid     = {PreJuSER-362},
      pages        = {1175 - 1188},
      year         = {2008},
      note         = {We gratefully acknowledge field assistance by Rainer Harms,
                      partial funding of A. Graf's postdoctoral appointment by the
                      "Impuls- und Vernetzungsfonds" of the Helmholtz Association,
                      financial support by the Helmholtz-funded FLOWatch project
                      and by the SFB/TR 32 "Patterns in SoilVegetation-Atmosphere
                      Systems: Monitoring, Modelling, and Data Assimilation"
                      funded by the Deutsche Forschungsgemeinschaft (DFG), and
                      helpful comments by all participants of the BGD open
                      discussion related to this publication.},
      abstract     = {CO2 efflux at the soil surface is the result of respiration
                      in different depths that are subjected to variable
                      temperatures at the same time. Therefore, the temperature
                      measurement depth affects the apparent temperature
                      sensitivity of field-measured soil respiration. We summarize
                      existing literature evidence on the importance of this
                      effect, and describe a simple model to understand and
                      estimate the magnitude of this potential error source for
                      heterotrophic respiration. The model is tested against field
                      measurements. We discuss the influence of climate (annual
                      and daily temperature amplitude), soil properties (vertical
                      distribution of CO2 sources, thermal and gas diffusivity),
                      and measurement schedule (frequency, study duration, and
                      time averaging). Q(10) as a commonly used parameter
                      describing the temperature sensitivity of soil respiration
                      is taken as an example and computed for different
                      combinations of the above conditions. We define conditions
                      and data acquisition and analysis strategies that lead to
                      lower errors in field-based Q(10) determination. It was
                      found that commonly used temperature measurement depths are
                      likely to result in an underestimation of temperature
                      sensitivity in field experiments. Our results also apply to
                      activation energy as an alternative temperature sensitivity
                      parameter.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4 / JARA-ENERGY},
      ddc          = {570},
      cid          = {I:(DE-Juel1)VDB793 / $I:(DE-82)080011_20140620$},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Ecology / Geosciences, Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000259986400016},
      url          = {https://juser.fz-juelich.de/record/362},
}