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  • 1
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    Assessing the long-run yield of a forest stand subject to the risk of fire (1985)
    Canadian Science Publishing
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    Publication Date: 1985-08-01
    Description: The problem of determining the effects of forest fire on stand yields is often neglected in forest yield analyses. Using previous theoretical results, "fire-adjusted, volume–rotation curves" can be developed which provide a graphical technique for determining optimal rotation age and long-run yield when the risk of fire is present. For white spruce of the northern interior of British Columbia it is shown that even modest rates of fire can result in very large reductions in long-run yield. Similar results are established for the effects of fire on land expectation value, which is dissipated very quickly under the risk of fire.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 2
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    Optimal harvest scheduling at the forest level in the presence of the risk of fire (1986)
    Canadian Science Publishing
    Details
    Publication Date: 1986-04-01
    Description: The effect of fire on forest yields has been well documented in stand-level analyses; however, forest-level effects are less widely known. A set of dynamic equations can be constructed that describe the evolution of a forest under the impact of harvesting and random fire. When fire is treated in a deterministic fashion, these equations can be used to formulate an optimal harvest scheduling problem that can be solved using linear programming. Examples using white spruce data for the Fort Nelson Timber Supply Area of British Columbia show that even modest rates of fire can have a dramatic impact and that present harvest scheduling models may be considerably overestimating projected forest harvest levels. Results also show that the deterministic approach appears to be a reasonable approximation of the true stochastic fire problem.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 3
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    Determining the effects of harvesting guidelines on the age-class profile of the residual forest (1993)
    Canadian Science Publishing
    Details
    Publication Date: 1993-09-01
    Description: Chromatic scheduling was used to demonstrate that harvest unit adjacency constraints can be translated into age-class profile constraints that are suitable for regulating the rate of harvest in strategic forest planning models. The advantage of the age-class approach is that strategic harvest rates will reflect the spatial constraints without the onerous task of designing and scheduling cut blocks for the entire forest. Other factors that are relevant to determining the steady-state age-class profile are the exclusion period and the width of the leave strip between any two harvest units. Through the analysis of four spatial data sets it was observed that the chromatic number decreases as the block size increases; however, the absolute block size was not a factor. The controlling factor is the underlying block pattern (maximum number of adjacent units and the number of units sharing a common boundary point). When high chromatic numbers are combined with long exclusions periods the results are long rotations and reduced periodic harvests. There is a wide range in the number and timing of harvest entries and the resulting age-class structures that are spatially feasible. This suggests that resource policy makers should think in terms of the desired residual forest structure prior to prescribing harvesting guidelines.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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