Graduate Thesis Or Dissertation
 

Growth growing-stock relationships in young Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco)

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  • In the thinning theory, the hypothesis that the stand growth is unaffected by the density over a broad range of densities is generally accepted today. In this study three different measures of stand density were used in basal area growth and volume growth multiple regressions in even-aged managed stands, searching for the optimum density level. The three measures of stand density selected were: Basal Area, Relative Density Index (Drew and Flewelling, 1979) and Stand Density Index (Reineke, 1933). The population for the study consisted of a natural young Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stand, at Hoskins in the Oregon Coast Range, which has been repeatedly thinned at different intensities. The graphical solutions of the developed regression equations showed that for the basal area growth all the three density measures studied led to similar optimum growth estimates and supported the widely accepted Langsaeter-Moller hypothesis. From a management standpoint one can say that, within the studied age interval (23 to 36 years), the maximum basal area growth lies between 175 to 225 ft²/ac of basal area. The shape of the volume growth curves shows in most cases an increasing tendency with no signs of a maximum within the range of densities represented in this study. The different shapes of the basal area growth and of the volume growth curves reflect the fact that young stands of Douglas-fir maintain a fairly rapid height growth rate. The results of this study should essentially serve as a guide for potential stand growth, as one knows the existing differences between growth and yield on small research plots and on large managed forests.
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