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@ARTICLE{Liu:864340,
      author       = {Liu, Qun and Zhuang, Liyan and Yin, Rui and Ni, Xiangyin
                      and You, Chengming and Yue, Kai and Tan, Bo and Liu, Yang
                      and Zhang, Li and Xu, Zhenfeng},
      title        = {{R}oot diameter controls the accumulation of humic
                      substances in decomposing root litter},
      journal      = {Geoderma},
      volume       = {348},
      issn         = {0016-7061},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2019-04136},
      pages        = {68 - 75},
      year         = {2019},
      abstract     = {The humification of plant litter is a crucial step for the
                      buildup of soil organic matter in terrestrial ecosystems.
                      Yet, how environmental change and substrate quality affect
                      root humification still remains poorly understood. A
                      two-year litterbag experiment was conducted to assess the
                      root mass remaining and accumulation of humic substances in
                      roots of three diameter classes (0–2, 2–5 and
                      5–10 mm) of two common subalpine tree species (Picea
                      asperata and Abies faxoniana) at two elevations (3037 m
                      and 3580 m) on the eastern Tibetan Plateau. No significant
                      differences were found between elevation treatments in the
                      concentration of humic substances. Both root mass loss and
                      concentrations of humic substance, humic acid and fulvic
                      acid decreased with increasing root diameter. Both fulvic
                      acid concentration and humification degree declined as root
                      decomposition progressed but humic acid concentration
                      exhibited an opposite trend. Our results reveal that the
                      diameter-associated variations in accumulation of humic
                      substances were substantially stronger than altitudinal and
                      interspecific differences in decomposing root litters. These
                      findings have important implications for carbon
                      sequestration via root humification in the subalpine forests
                      experiencing snow-covered winter.},
      cin          = {IBG-3},
      ddc          = {910},
      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:000470042500008},
      doi          = {10.1016/j.geoderma.2019.04.016},
      url          = {https://juser.fz-juelich.de/record/864340},
}