A biophysical surface energy budget analysis of soil temperature in the boreal forests of interior Alaska

A biophysical surface energy budget analysis of soil temperature in the boreal forests of... Observed soil degree‐days (SDD) for 20 forest stands in the discontinuous permafrost zone of interior Alaska range from 483 to 2217. These stands differ in terms of forest structure, topography, and soils. A biophysical model that solves the surface energy budget of a multilayer forest canopy was used to examine which site factors were most important in controlling the observed soil temperature gradient. Simulated soil temperature averaged 851 SDD for the 20 sites. Sensitivity analyses indicated that this average could vary by 0–88 SDD (0–10% of the mean) because of possible parameter error. Removing the forest canopy and the moss cover caused the soil to warm, on average, by 408 and 345 SDD, respectively. Elevation and soil drainage differences among sites were of secondary importance, causing SDD to deviate by 71 and 66 SDD, respectively. Slope and aspect had little effect on soil temperature. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water Resources Research Wiley

A biophysical surface energy budget analysis of soil temperature in the boreal forests of interior Alaska

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Abstract

Observed soil degree‐days (SDD) for 20 forest stands in the discontinuous permafrost zone of interior Alaska range from 483 to 2217. These stands differ in terms of forest structure, topography, and soils. A biophysical model that solves the surface energy budget of a multilayer forest canopy was used to examine which site factors were most important in controlling the observed soil temperature gradient. Simulated soil temperature averaged 851 SDD for the 20 sites. Sensitivity analyses indicated that this average could vary by 0–88 SDD (0–10% of the mean) because of possible parameter error. Removing the forest canopy and the moss cover caused the soil to warm, on average, by 408 and 345 SDD, respectively. Elevation and soil drainage differences among sites were of secondary importance, causing SDD to deviate by 71 and 66 SDD, respectively. Slope and aspect had little effect on soil temperature.

Journal

Water Resources ResearchWiley

Published: May 1, 1991

References

  • A soil‐plant‐atmosphere model for transpiration and availability of soil water
    Federer, Federer
  • Leaf water stress in Engelmann spruce: Influence of the root and shoot environment
    Kaufmann, Kaufmann
  • Leaf conductance as a function of photosynthetic photon flux density and absolute humidity difference from leaf to air
    Kaufmann, Kaufmann
  • Evaluation of season, temperature, and water stress effects on stomata using a leaf conductance model
    Kaufmann, Kaufmann
  • Estimating the effects of understory removal from a Douglas fir forest using a two‐layer canopy evapotranspiration model
    Kelliher, Kelliher; Black, Black; Price, Price
  • Albedo of intercepted snow
    Leonard, Leonard; Eschner, Eschner
  • Soil temperature influences on root resistance of Pinus contorta seedlings
    Running, Running; Reid, Reid
  • Computation of solar radiation from sky cover
    Thompson, Thompson

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