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@ARTICLE{DeFeudis:829704,
      author       = {De Feudis, M. and Cardelli, V. and Massaccesi, L. and
                      Hofmann, D. and Berns, A. E. and Bol, R. and Cocco, S. and
                      Corti, G. and Agnelli, A.},
      title        = {{A}ltitude affects the quality of the water-extractable
                      organic matter ({WEOM}) from rhizosphere and bulk soil in
                      {E}uropean beech forests},
      journal      = {Geoderma},
      volume       = {302},
      issn         = {0016-7061},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2017-03348},
      pages        = {6 - 13},
      year         = {2017},
      abstract     = {Water-extractable organic matter (WEOM) is the most dynamic
                      and bioavailable fraction of the soil organicmatter pool.
                      Although the litterfloor is considered the main source of
                      WEOM, roots also release a great amountof labile organic
                      compounds through rhizodeposition processes. This makes the
                      rhizosphere, the small soilvolume in proximity to the roots,
                      a soil compartment relatively enriched in WEOM. Since both
                      the rhizosphereand the labile organic C pool are highly
                      sensitive to the environmental conditions we evaluated
                      thecharacteristics of WEOM from rhizosphere and bulk soil
                      collected from the A horizons of European beech(Fagus
                      sylvaticaL.) forest soils of Apennines mountains (central
                      Italy) at two altitudes (800 and 1000 m), usingelevation as
                      a proxy for temperature change. Specifically, we tested ifi)
                      the rhizosphere contains higher amountsof WEOM with a
                      greater diversity of compounds with respect to the bulk
                      soil, andii) this effect is morepronounced at higher
                      altitude. At both 800 m and 1000 m above sea level, the main
                      distinction between WEOMfrom rhizosphere and bulk soil was
                      the larger amounts of sugars in the soil close to the roots.
                      Further, our resultsindicated an influence of altitude on
                      rhizospheric processes as suggested by the larger
                      concentrations of organicC and soluble phenols, and richness
                      of tannins in the rhizosphere WEOM than in the bulk soil at
                      1000 m. Weattributed this influence to environmental
                      constraints which enhanced the release of labile organics
                      andsecondary metabolites by rhizodeposition and humification
                      processes in the rhizosphere. As a whole, our datadraw a
                      picture where the roots are able to affect the
                      characteristics of WEOM and environmental constraintsenhance
                      the differentiation between rhizosphere and bulk soil. This
                      view confirms the influence of therhizosphere on the soil C
                      cycle, and the importance of the rhizospheric processes when
                      environmental conditionsbecome harsher.},
      cin          = {IBG-3},
      ddc          = {550},
      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:000403522800002},
      doi          = {10.1016/j.geoderma.2017.04.015},
      url          = {https://juser.fz-juelich.de/record/829704},
}