Graduate Thesis Or Dissertation
 

Determining the cost of old-growth set-asides on the OSU college forest

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/z890rx188

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  • The objectives for the use of the Oregon State University college forest include providing both facilities for research and teaching, and providing funding through timber harvest. The older age-classes of the forest are valuable for attaining both objectives. The opportunities and costs of removing acreage in the older age classes from the timber harvest base were examined. Harvest schedules were developed using a model II linear programming formulation with the OSU Forestry Model. The harvest schedules used the current management policies of the forest managers and different levels of set-asides with a non-declining even flow of volume constraining the harvest level. The current rotation age of 90 years was found to be constraining the harvest level in the first four decades, therefore a set of harvest scheduling runs using a 60 year rotation age were done. Using the existing management policies and a rotation age of 90 years, the managers of the college forest can set-aside the oldest 686 acres of the forest without reducing the current harvest level. The cost of the set-sides (calculated as the difference between present net values of 100 year harvest schedules with and without the acreage removed) was between $5500 and $4500 per acre depending on the amount of acreage removed. The change in rotation age produced only slight changes in the cost of set-asides. The current harvest level could be increased immediately to a level near long-term sustained yield by using a rotation age of 60 years. This would increase the present net value of the harvest schedule by about $5 million. By using a rotation age of 90, more age classes can be represented on the forest over time. After four decades the harvest volume can be increased to the long-term sustained yield level. At that time the harvest would be obtained from fewer acres than if the forest was on a 60 year rotation.
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