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@ARTICLE{Mukherjee:281970,
      author       = {Mukherjee, Santanu and Weihermüller, Lutz and Tappe,
                      Wolfgang and Vereecken, Harry and Burauel, Peter},
      title        = {{M}icrobial respiration of biochar- and digestate-based
                      mixtures},
      journal      = {Biology and fertility of soils},
      volume       = {52},
      number       = {2},
      issn         = {0178-2762},
      address      = {Berlin},
      publisher    = {Springer},
      reportid     = {FZJ-2016-01614},
      pages        = {151 - 164},
      year         = {2016},
      abstract     = {The addition of biochar or digestate as organic amendments
                      to soils is currently controversially discussed with regard
                      to its positive and negative effects on C mineralization.
                      Organic amendments are generally applied to agricultural
                      fields to improve soil quality and crop yield. In this
                      study, we present results from short-term respiration
                      experiments (90 days), where two different biochars
                      (produced at 400 and 800 °C) as well as digestate from
                      biogas production were added in different combinations to
                      two soils (loamy sand and silt loam). Additionally, both
                      amendments were mixed together into the soil to study
                      interactions between biochar and digestate effects and
                      investigate the interactions of both amendments with clay
                      minerals resulting in a total of 13 mixtures (plus control
                      soils) per soil type. The results indicate that the rate of
                      CO2 evolution was not proportional to the amount of C added
                      to the systems indicating a saturation effect in the C
                      degradation mechanism. More than 40 $\%$ of the digestate C
                      was released as CO2 and only 3 $\%$ for the biochar soil
                      mixture; the recalcitrant nature of biochar and its
                      suitability for short-term C stabilization in soils
                      (incubation period of 90 days) were shown. Surprisingly, a
                      much lower CO2 release (up to 11-fold) was observed in
                      soil/digestate/biochar compared to soil/digestate mixtures
                      without biochar. This effect was observed even when only 1
                      $\%$ (w/w) biochar was added to the digestate/soil mixtures,
                      indicating that the biochar changed the physicochemical
                      properties of the system. Additional dissolved organic C
                      (DOC) sorption experiments revealed that large quantities of
                      DOC can be sorbed by the biochar reducing the microbial
                      accessible DOC in the liquid phase and as a consequence also
                      the CO2 production.},
      cin          = {IBG-3},
      ddc          = {630},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000373441100003},
      doi          = {10.1007/s00374-015-1060-x},
      url          = {https://juser.fz-juelich.de/record/281970},
}