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@ARTICLE{Dorau:902545,
      author       = {Dorau, Kristof and Bohn, Bianca and Weihermüller, Lutz and
                      Mansfeldt, Tim},
      title        = {{T}emperature-induced diurnal redox potential in soil},
      journal      = {Environmental science},
      volume       = {23},
      number       = {11},
      issn         = {2050-7887},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {FZJ-2021-04347},
      pages        = {1782 - 1790},
      year         = {2021},
      abstract     = {With the capabilities to measure redox potentials (EH) at a
                      high temporal resolution, scientists have observed diurnal
                      EH that occur in a distinct periodicity in soils and
                      sediments. These patterns have been disregarded for a long
                      time because minor fluctuations of the EH in the tens of mV
                      range are difficult to interpret. Various explanations have
                      been proposed for the origin of diel EH but a cohesive
                      assessment of the temperature-dependency for field- and
                      laboratory-based investigations is missing at present. In
                      this study, we investigated spatiotemporal diel EH of
                      previous long-term (up to 10 years) field- and lab-based
                      monitoring data collected at high-temporal (every hour) and
                      spatial (up to 6 depths) resolution. In addition, we set up
                      a redox experiment where we manipulated the soil temperature
                      (ST) by diel temperature cycles to assess the EH response.
                      Diel fluctuations were absent for laboratory experiments
                      with ΔEH of a few mV (daily EH-max – daily EH-min), but
                      we found pronounced fluctuations up to ∼100 mV for field
                      investigations. The spatiotemporal pattern in EH
                      fluctuations was amplified in the topsoil during the summer
                      months concomitant with ST. We showed for the first time
                      that changes in ST during an incubation experiment altered
                      the EH by −3.3 mV °C−1 and inferred that the diel EH
                      were driven by the thermal conditions of the soil itself.
                      This is particularly important when EH is measured close to
                      the soil surface and underlines that minor fluctuations of
                      the EH with a recurring periodicity should be carefully
                      checked for its dependency with the soil and reference
                      electrode temperature. Redox measurements should not be
                      considered a routine determination and cautious handling of
                      EH data by physical sound corrections is urgently needed in
                      order to link ΔEH to daily biogeochemical cycling in
                      soils.},
      cin          = {IBG-3},
      ddc          = {333.7},
      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},
      pubmed       = {pmid:34704578},
      UT           = {WOS:000711538600001},
      doi          = {10.1039/D1EM00254F},
      url          = {https://juser.fz-juelich.de/record/902545},
}