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• W2081292868 abstract "A number of models to predict the light environment of individual plants have been derived from an approach suggested by Norman and Welles. These models follow the passage of beams of light from the sun through the vegetation canopy moment by moment throughout individual days and require detailed descriptions of the crown of each plant. They may be very expensive of computer time and considerable care in their application is required if they are to be useful in practice. In this work, a description is given of such a model with particular application to forests in Australia. Simulations are undertaken to show that predictions by the model are consistent with theoretical expectations and to determine what length of time steps during a day and how frequently during a year the model must be applied to yield useful estimates of light absorption by a forest canopy. It is then applied in a 12-year-old regrowth stand of Eucalyptus regnans F. Muell. in southern Tasmania where each individual tree crown was represented either in a complex fashion as a set of spherical shapes or much more simply as a single ellipsoid. The model was used to predict (a) the amount of light absorbed by the crown of each tree in this stand, (b) the average light intensity to which each crown was exposed, and (c) the light intensity at single points within the crown of each tree over periods of a single hour, a single day or a whole year and when the stand was unthinned or thinned to varying degrees. There was good correlation between results for the crowns when represented in the complex fashion with those when the crowns were represented as single ellipsoids for both (a) and (b). However, correlations were much poorer for (c), presumably because of the micro-effects of within-crown shading, which can be simulated with the complex crown representation but not with the single ellipsoidal representation. Computing time with a late generation microcomputer was much shorter with the ellipsoidal representation of crowns and appeared to be short enough for many practical applications." @default.
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• W2081292868 date "1992-04-01" @default.
• W2081292868 modified "2023-10-17" @default.
• W2081292868 title "Method of application of a model to predict the light environment of individual tree crowns and its use in a eucalypt forest" @default.
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• W2081292868 doi "https://doi.org/10.1016/0304-3800(92)90034-c" @default.
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