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@ARTICLE{Brggemann:17749,
      author       = {Brüggemann, N. and Gessler, A. and Kayler, Z. and Keel,
                      S.G. and Badeck, F. and Barthel, M. and Boeckx, P. and
                      Buchmann, N. and Brugnoli, E. and Esperschütz, J. and
                      Gavrichkova, O. and Ghashghaie, J. and Gomez-Casanovas, N.
                      and Keitel, C. and Knohl, A. and Kuptz, D. and Palacio, S.
                      and Salmon, Y. and Uchida, Y. and Bahn, M.},
      title        = {{C}arbon allocation and carbon isotope fluxes in the
                      plant-soil-atmosphere ontinuum: a review},
      journal      = {Biogeosciences},
      volume       = {8},
      issn         = {1726-4170},
      address      = {Katlenburg-Lindau [u.a.]},
      publisher    = {Copernicus},
      reportid     = {PreJuSER-17749},
      pages        = {3457 - 3489},
      year         = {2011},
      note         = {This review is an outcome of the conference "Stable
                      Isotopes and Biogeochemical Cycles in Terrestrial
                      Ecosystems" in Monte Verita, Ascona, Switzerland, in March
                      2010. We acknowledge co-funding of this conference by the
                      COST Action ES0806 SIBAE (Stable Isotopes in
                      Biosphere-Atmosphere-Earth System Research). Arthur Gessler
                      acknowledges financial support by the DFG (Deutsche
                      Forschungsgemeinschaft). Jurgen Esperschutz acknowledges the
                      Transregional Collaborative Research Centre 38 (SFB/TRR38),
                      which is financially supported by the DFG. Matthias Barthel
                      and Alexander Knohl were funded by the EC Marie Curie
                      Excellence grant ISOCYCLE under contract no.
                      MEXTCT-2006-042268. Michael Bahn acknowledges financial
                      support by the Austrian Science Fund projects FWF P18756-B16
                      and P22214-B17 as well as the EU-project CARBO-Extreme, GA
                      no. 226701 (FP7/2007-2013). Zachary Kayler would like to
                      thank Delphine Derriene and Markus Kleber for reviewing the
                      SOM section.},
      abstract     = {The terrestrial carbon (C) cycle has received increasing
                      interest over the past few decades, however, there is still
                      a lack of understanding of the fate of newly assimilated C
                      allocated within plants and to the soil, stored within
                      ecosystems and lost to the atmosphere. Stable carbon isotope
                      studies can give novel insights into these issues. In this
                      review we provide an overview of an emerging picture of
                      plant-soil-atmosphere C fluxes, as based on C isotope
                      studies, and identify processes determining related C
                      isotope signatures. The first part of the review focuses on
                      isotopic fractionation processes within plants during and
                      after photosynthesis. The second major part elaborates on
                      plant-internal and plant-rhizosphere C allocation patterns
                      at different time scales (diel, seasonal, interannual),
                      including the speed of C transfer and time lags in the
                      coupling of assimilation and respiration, as well as the
                      magnitude and controls of plant-soil C allocation and
                      respiratory fluxes. Plant responses to changing
                      environmental conditions, the functional relationship
                      between the physiological and phenological status of plants
                      and C transfer, and interactions between C, water and
                      nutrient dynamics are discussed. The role of the C
                      counterflow from the rhizosphere to the aboveground parts of
                      the plants, e. g. via CO2 dissolved in the xylem water or as
                      xylem-transported sugars, is highlighted. The third part is
                      centered around belowground C turnover, focusing especially
                      on above-and belowground litter inputs, soil organic matter
                      formation and turnover, production and loss of dissolved
                      organic C, soil respiration and CO2 fixation by soil
                      microbes. Furthermore, plant controls on microbial
                      communities and activity via exudates and litter production
                      as well as microbial community effects on C mineralization
                      are reviewed. A further part of the paper is dedicated to
                      physical interactions between soil CO2 and the soil matrix,
                      such as CO2 diffusion and dissolution processes within the
                      soil profile. Finally, we highlight state-of-the-art stable
                      isotope methodologies and their latest developments. From
                      the presented evidence we conclude that there exists a tight
                      coupling of physical, chemical and biological processes
                      involved in C cycling and C isotope fluxes in the
                      plant-soil-atmosphere system. Generally, research using
                      information from C isotopes allows an integrated view of the
                      different processes involved. However, complex interactions
                      among the range of processes complicate or currently impede
                      the interpretation of isotopic signals in CO2 or organic
                      compounds at the plant and ecosystem level. This review
                      tries to identify present knowledge gaps in correctly
                      interpreting carbon stable isotope signals in the
                      plant-soil-atmosphere system and how future research
                      approaches could contribute to closing these gaps.},
      keywords     = {J (WoSType)},
      cin          = {IBG-3},
      ddc          = {570},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {Terrestrische Umwelt / CARBO-EXTREME - The terrestrial
                      Carbon cycle under Climate Variability and Extremes $\u2013$
                      a Pan-European synthesis (226701)},
      pid          = {G:(DE-Juel1)FUEK407 / G:(EU-Grant)226701},
      shelfmark    = {Ecology / Geosciences, Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000298132200023},
      doi          = {10.5194/bgd-8-3619-2011},
      url          = {https://juser.fz-juelich.de/record/17749},
}