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@ARTICLE{Konrad:1039723,
      author       = {Konrad, Alexander and Hofmann, Diana and Siemens, Jan and
                      Stutz, Kenton P. and Lang, Friederike and Mulder, Ines},
      title        = {{M}icrobial carbon use efficiency of mineral-associated
                      organic matter is related to its desorbability},
      journal      = {Soil biology $\&$ biochemistry},
      volume       = {203},
      issn         = {0038-0717},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2025-01771},
      pages        = {109740},
      year         = {2025},
      abstract     = {Interactions between organic substances, minerals, and
                      microorganisms are crucial for organic carbon
                      (OC)stabilization in soil. We hypothesized that thresholds
                      of sorption strength (described by the sorption coefficient
                      ofthe Freundlich isotherms) and desorbability (i.e., the
                      ratio of the amount desorbed to the amount sorbed) oforganic
                      monomers control the extent of their microbial
                      processing.Freundlich sorption isotherms and desorbability
                      of uniformly 14C-labeled glucose,
                      acetylglucosamine,phenylalanine, salicylic acid, and citric
                      acid onto goethite, kaolinite, and illite were studied in
                      batch experiments.Monomers adsorbed to minerals were mixed
                      with loamy and sandy arable topsoil and incubated at 25
                      ◦C.Mineralization of mineral-adsorbed monomers was
                      observed over three weeks, after which the assimilation
                      intomicrobial biomass, and the 14C remaining in soil were
                      quantified. Subsequently, the mineralization of
                      incubatedsoils was observed for additional three weeks after
                      glucose priming.The adsorption of carboxylic acids onto
                      minerals exceeded that of (amino) sugars and phenylalanine,
                      with theoverall highest amounts both adsorbed and retained
                      after desorption with water for goethite. Assimilation
                      ofmonomer 14C into microbial biomass and the microbial
                      carbon use efficiency (CUE) of mineral-adsorbedmonomers in
                      both soils increased linearly with the monomer desorbability
                      from mineral phases. Furthermore,the CUEs of monomers
                      adsorbed to goethite were lower than those of the same
                      monomers adsorbed to clayminerals. In terms of total amount
                      of carbon retained in the soil, carboxylic acids adsorbed on
                      goethite showedhighest values, emphasizing the significance
                      of oxides for the stabilization of OC within soils. Priming
                      of incu-bated soil with non-labeled glucose caused an
                      additional mineralization of monomer-C, with the priming
                      effectdecreasing from goethite to clay minerals.We conclude
                      that sorption strength and desorbability shape microbial
                      utilization of mineral-bound organiccompounds, but no
                      universal thresholds determine bio-accessibility of sorbed
                      organic compounds.},
      cin          = {IBG-3},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001427425600001},
      doi          = {10.1016/j.soilbio.2025.109740},
      url          = {https://juser.fz-juelich.de/record/1039723},
}