Energy partitioning influenced by tree spacing

Authors: Irvine, M.1; Gardiner, B.2; Morse, A.3

Source: Agroforestry Systems, Volume 39, Number 3, March 1998 , pp. 211-224(14)

Publisher: Springer

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An energy partitioning experiment was set-up within an experimental agroforest site at Cloich forest, near Edinburgh. Measurements of turbulent heat fluxes were made — during non stress conditions — both directly by eddy-covariance techniques and in the case of latent heat flux indirectly through closure of the energy budget equation. These measurements were made simultaneously in the thinned plots (one plot at a time) and a reference plot to eliminate differences due to external atmospheric conditions. Observed values of Bowen ratio ranged from 1 to 3.5, with significantly lower values in the thinned plots compared with those measured in the reference plot. On separation of the Bowen ratio into its two components, it was found that sensible heat flux remained constant between plots. The latent heat flux, however, increased as the tree density was reduced. A simple model of the evaporation from the forest plots based on the Penman-Monteith equation and incorporating an under-storey component was developed and was able to accurately replicate the observed results.

Keywords: Bowen; Penman-Monteith; evaporation; spruce; turbulence

Document Type: Research Article


Affiliations: 1: Department of Geography, University of Liverpool, UK, Email: 2: Forestry Commission, Northern Research Station, Roslin, Midlothian, EH25 9SY, UK, 3: Department of Geography, University of Liverpool, UK,

Publication date: March 1, 1998

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