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@ARTICLE{Ney:862557,
      author       = {Ney, Patrizia and Graf, Alexander and Bogena, Heye and
                      Bernd, Diekkrüger and Drüe, Clemens and Esser, Odilia and
                      Heinemann, Günther and Klosterhalfen, Anne and Pick,
                      Katharina and Pütz, Thomas and Schmidt, Marius and Valler,
                      Veronika and Vereecken, Harry},
      title        = {{CO}$_2$ fluxes before and after partial deforestation of a
                      {C}entral {E}uropean spruce forest},
      journal      = {Agricultural and forest meteorology},
      volume       = {274},
      issn         = {0168-1923},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2019-02851},
      pages        = {61-74},
      year         = {2019},
      abstract     = {A seven year CO$_2$-flux dataset measured in a 70 year old
                      spruce monoculture is presented, of which 22\% was
                      deforested three years after the start of the measurements
                      to accelerate regeneration towards natural deciduous
                      vegetation. An eddy covariance (EC) system, mounted on top
                      of a tower within the spruce forest, continuously sampled
                      fluxes of momentum, sensible heat, latent heat and CO$_2$.
                      After clear-cutting, a second EC station with an identical
                      set of instruments was installed inside the deforested area.
                      In total, we examined an EC dataset including three years
                      before (forest) and four years after partial deforestation
                      (forest and deforested). Full time series and annual carbon
                      budgets of the net ecosystem exchange (NEE) and its
                      components gross primary production (GPP) and total
                      ecosystem respiration (Reco) were calculated for both EC
                      sites. Soil respiration was measured with manual chambers on
                      average every month after the deforestation at 75
                      measurement points in the forest and deforested area. Annual
                      sums of NEE measured above the forest indicated a strong
                      carbon sink of -660 (-535) g C m$^{-2}$ y$^{-1}$ with small
                      interannual variability ±78 (72) g C m$^{-2}$ y$^{-1}$
                      (values in brackets including correction for self-heating of
                      the open-path gas analyzer). In the first year after partial
                      deforestation, regrowth on the clearcut consisted mainly of
                      grasses, with beginning of the second year shrubs and young
                      trees became increasingly important. The regrowth of
                      vegetation is reflected in the annual sums of NEE, which
                      decreased from a carbon source of 521 (548) g C m$^{-2}$
                      y$^{-1}$ towards 82 (236) g C m$^{-2}$ y$^{-1}$ over the
                      past four years, due to an increase in the magnitude of GPP
                      from 385 (447) to 892 (1036) g C m$^{-2}$ y$^{-1}$.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255) / IDAS-GHG - Instrumental and Data-driven
                      Approaches to Source-Partitioning of Greenhouse Gas Fluxes:
                      Comparison, Combination, Advancement (BMBF-01LN1313A) /
                      TERENO - Terrestrial Environmental Observatories
                      (TERENO-2008)},
      pid          = {G:(DE-HGF)POF3-255 / G:(DE-Juel1)BMBF-01LN1313A /
                      G:(DE-HGF)TERENO-2008},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000471356600007},
      doi          = {10.1016/j.agrformet.2019.04.009},
      url          = {https://juser.fz-juelich.de/record/862557},
}