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@ARTICLE{VonSperber:203160,
      author       = {Von Sperber, C. and Weiler, M. and Brüggemann, N.},
      title        = {{T}he effect of soil moisture, soil particle size, litter
                      layer and carbonic anhydrase on the oxygen isotopic
                      composition of soil-released {CO} $_{2}$},
      journal      = {European journal of soil science},
      volume       = {66},
      number       = {3},
      issn         = {1351-0754},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {FZJ-2015-05165},
      pages        = {566 - 576},
      year         = {2015},
      abstract     = {Soil respiration and photosynthesis are the two largest
                      carbon dioxide (CO2) fluxes between terrestrial ecosystems
                      and the atmosphere and, therefore, the dominant processes
                      influencing the oxygen isotopic composition of atmospheric
                      CO2. The characterization of temporal and spatial variations
                      of plant and soil-related fluxes of different oxygen
                      isotopologues of CO2 (12C16O2; 12C16O18O) is relevant to
                      constraining the global carbon budget. The oxygen isotopic
                      composition of soil-respired CO2 is controlled by its
                      release rate, the degree of isotopic equilibrium with soil
                      water and the diffusional transport of CO2. The hypothesis
                      of this study was that, as well as soil moisture, the soil
                      particle size, the presence of an organic litter layer and
                      the enzyme carbonic anhydrase (CA) would have a significant
                      impact on the oxygen isotopic composition of soil-released
                      CO2. We tested this hypothesis with soil microcosm
                      experiments on columns of medium and fine sand. Soil water
                      content and soil texture influenced the isotopic composition
                      of soil-released CO2 significantly. A litter layer had a
                      significant effect on the isotopic composition of water
                      vapour but not on CO2 released from soil. In the absence of
                      CA, oxygen isotope equilibration between the CO2 invasion
                      flux and soil water was insignificant, whereas in the
                      presence of CA about $55\%$ of the CO2 invading the soil
                      exchanged oxygen isotopes with soil water. Our findings
                      highlight the importance of small-scale variability of soil
                      attributes for the oxygen isotopic composition of
                      soil-released CO2 as well as the strong impact of CA
                      activity in soils.},
      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:000355004000018},
      doi          = {10.1111/ejss.12241},
      url          = {https://juser.fz-juelich.de/record/203160},
}