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@ARTICLE{deSosa:859359,
      author       = {de Sosa, Laura L. and Glanville, Helen C. and Marshall,
                      Miles R. and Schnepf, Andrea and Cooper, David M. and Hill,
                      Paul W. and Binley, Andrew and Jones, Davey L.},
      title        = {{S}toichiometric constraints on the microbial processing of
                      carbon with soil depth along a riparian hillslope},
      journal      = {Biology and fertility of soils},
      volume       = {54},
      number       = {8},
      issn         = {1432-0789},
      address      = {Heidelberg},
      publisher    = {Springer},
      reportid     = {FZJ-2019-00227},
      pages        = {949 - 963},
      year         = {2018},
      abstract     = {Soil organic matter (SOM) content is a key indicator of
                      riparian soil functioning and in the provision of ecosystem
                      services such as water retention, flood alleviation,
                      pollutant attenuation and carbon (C) sequestration for
                      climate change mitigation. Here, we studied the importance
                      of microbial biomass and nutrient availability in regulating
                      SOM turnover rates. C stabilisation in soil is expected to
                      vary both vertically, down the soil profile and laterally
                      across the riparian zone. In this study, we evaluated the
                      influence of five factors on C mineralisation (Cmin): (i)
                      substrate quantity, (ii) substrate quality, (iii) nutrient
                      (C, N and P) stoichiometry, (iv) soil microbial activity
                      with proximity to the river (2 to 75 m) and (v) as a
                      function of soil depth (0–3 m). Substrate quality,
                      quantity and nutrient stoichiometry were evaluated using
                      high and low molecular weight 14C-labelled dissolved organic
                      (DOC) along with different nutrient additions. Differences
                      in soil microbial activity with proximity to the river and
                      soil depth were assessed by comparing initial (immediate)
                      Cmin rates and cumulative C mineralised at the end of the
                      incubation period. Overall, microbial biomass C (MBC),
                      organic matter (OM) and soil moisture content (MC) proved to
                      be the major factors controlling rates of Cmin at depth.
                      Differences in the immediate and medium-term response (42
                      days) of Cmin suggested that microbial growth increased and
                      carbon use efficiency (CUE) decreased down the soil profile.
                      Inorganic N and/or P availability had little or no effect on
                      Cmin suggesting that microbial community growth and activity
                      is predominantly C limited. Similarly, proximity to the
                      watercourse also had relatively little effect on Cmin. This
                      work challenges current theories suggesting that areas
                      adjacent to watercourse process C differently from upslope
                      areas. In contrast, our results suggest that substrate
                      quality and microbial biomass are more important in
                      regulating C processing rates rather than proximity to a
                      river.},
      cin          = {IBG-3},
      ddc          = {640},
      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:000447917800006},
      pubmed       = {pmid:30956377},
      doi          = {10.1007/s00374-018-1317-2},
      url          = {https://juser.fz-juelich.de/record/859359},
}