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@ARTICLE{Gbel:863326,
      author       = {Göbel, Leonie and Coners, Heinz and Hertel, Dietrich and
                      Willinghöfer, Sandra and Leuschner, Christoph},
      title        = {{T}he {R}ole of {L}ow {S}oil {T}emperature for
                      {P}hotosynthesis and {S}tomatal {C}onductance of {T}hree
                      {G}raminoids {F}rom {D}ifferent {E}levations},
      journal      = {Frontiers in Functional Plant Ecology},
      volume       = {10},
      issn         = {1664-462X},
      address      = {Lausanne},
      publisher    = {Frontiers Media88991},
      reportid     = {FZJ-2019-03406},
      pages        = {330},
      year         = {2019},
      abstract     = {In high-elevation grasslands, plants can encounter periods
                      with high air temperature while the soil remains cold, which
                      may lead to a temporary mismatch in the physiological
                      activity of leaves and roots. In a climate chamber
                      experiment with graminoid species from three elevations
                      (4400, 2400, and 250 m a.s.l.), we tested the hypothesis
                      that soil temperature can influence photosynthesis and
                      stomatal conductance independently of air temperature. Soil
                      monoliths with swards of Kobresia pygmaea (high alpine),
                      Nardus stricta (lower alpine), and Deschampsia flexuosa
                      (upper lowland) were exposed to soil temperatures of 25, 15,
                      5, and -2∘C and air temperatures of 20 and 10∘C for
                      examining the effect of independent soil and air temperature
                      variation on photosynthesis, leaf dark respiration, and
                      stomatal conductance and transpiration. Soil frost (-2∘C)
                      had a strong negative effect on gas exchange and stomatal
                      conductance in all three species, independent of the
                      elevation of origin. Leaf dark respiration was stimulated by
                      soil frost in D. flexuosa, but not in K. pygmaea, which also
                      had a lower temperature optimum of photosynthesis. Soil
                      cooling from 15 to 5∘C did not significantly reduce
                      stomatal conductance and gas exchange in any of the species.
                      We conclude that all three graminoids are able to maintain a
                      relatively high root water uptake in cold, non-frozen soil,
                      but the high-alpine K. pygmaea seems to be especially well
                      adapted to warm shoot – cold root episodes, as it has a
                      higher photosynthetic activity at 10 than 20∘C air
                      temperature and does not up-regulate leaf dark respiration
                      upon soil freezing, as was observed in the grasses from
                      warmer climates.},
      ddc          = {570},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.3389/fpls.2019.00330},
      url          = {https://juser.fz-juelich.de/record/863326},
}