Browsing by Author "Douglas Brodie, J."

Now showing 1 - 3 of 3
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    Dynamic Programming for Optimization of Timber Production and Grazing in Ponderosa Pine
    (1982) Kurt Riitters; Douglas Brodie, J.; David W. Hann
    Dynamic programming procedures are presented for optimizing thinning and rotation of even-aged ponderosa pine by using the four descriptors: age, basal area, number of trees, and time since thinning. Because both timber yield and grazing yield are functions of stand density, the two outputs—forage and timber—can both be optimized. The soil expectation values for single and joint production are derived and compared, and the impact of dynamic changes in relative price of the two products over the rotation is shown. Depending on relative prices and discount rate, the maximum soil expectations will be provided by timber alone, grazing alone, or an optimal schedule of joint production. Impacts of relative costs and values of the two outputs on management are discussed.
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    Maximizing Financial Yields by Integrating Logging and Silvicultural Techniques
    (1982-11) Chris B. LeDoux; Douglas Brodie, J.
    Substantial gains in merchantable volume yields and profits from Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stands in mountainous terrain can be achieved by considering logging and silvicultural techniques simultaneously. To maximize financial yields, managers must consider not only the length of the rotation, timing of entries, and volume removal per entry but also the proper harvesting equipment, precommercial and commercial thinning treatments, and fertilizer applications. The joint returns from combinations of techniques are greater than the sum of returns from each technique applied independently.
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    Regeneration Delay:Economic Cost and Harvest Loss
    (1982-01) Douglas Brodie, J.; Philip L. Tedder
    Failure to regenerate stands immediately after harvest results in losses of value and volume yield. The amount of loss differs when the effect of delay is assessed for an individual stand or forestwide. For the forest, the loss will depend on methods of determining the allowable cut and on inventory age-class distributions. A regeneration delay that results from transitory physical or budgeting constraints will have a different effect than delays programmed into all future rotations. Losses that appear massive when assessed at the stand level may have little effect on the allowable cut, while failure to rapidly regenerate stands that are economically marginal may greatly affect allowable cut on some forests.