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Energy balance of an isolated scots pine

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Abstract

The transpiration of an isolated Scots pine (P. sylvestris), determined by weighing, was related to stomatal resistance and environmental factors. The tree had been sheared to 1.5 m diameter at the base and 1.8 m high. The transpiration (2.97 MJ for 12h) was rather constant throughout the day and similar in shape to direct beam radiation incident upon the side of a cone. Transpiration rates calculated with the gradient equation duplicated measured values when vapor density gradients (obtained from measured needle temperature), measured stomatal resistance, and characteristic width of 3 mm in aerodynamic resistance were used in the calculations. Net radiation (Q*) for the tree was calculated by replacing the direct beam component of measured net radiation with the direct beam component incident upon a cone. The sensible heat flux, calculated with needle temperatures, was large (50.8 MJ) and nearly equal to Q* (53.85). The resulting Bowen ratio was 17. Transpiration calculated with a modified Penman-Monteith type equation simulated measured values.

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Authors and Affiliations

  1. College of Forest Resources AR-10, University of Washington, 98195, Seattle, Washington, USA

    L. J. Fritschen

Authors
  1. L. J. Fritschen
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  2. R. B. Walker
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  3. J. Hsia
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Fritschen, L.J., Walker, R.B. & Hsia, J. Energy balance of an isolated scots pine. Int J Biometeorol 24, 293–300 (1980). https://doi.org/10.1007/BF02250571

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