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Author: F. Thomas Ledig Publisher: ISBN: Category : Douglas fir Languages : en Pages : 16
Book Description
Three tree improvement programs were analyzed by break-even, cost-benefit technique: one for ponderosa pine in the Pacific Northwest, and two for Douglas-fir in the Pacific Northwest-one of low intensity and the other of high intensity. A return of 8 percent on investment appears feasible by using short rotations or by accompanying tree improvement with thinning. Interest rates, length of rotation, the inclusion of thinnings, and site index had greater effects on profitability than program design. Large breeding zones improved profitability, although they incur the biological risks of nonadaptation to local conditions and loss of local genetic resources. Increasing orchard seed yield affected the results only slightly unless the planting program could be expanded, which is equivalent to increasing the size of the breeding zone. If the increase in seed yield merely reduced the required acreage of seed orchard and associated costs, the financial results improved only slightly.
Author: F. Thomas Ledig Publisher: ISBN: Category : Douglas fir Languages : en Pages : 16
Book Description
Three tree improvement programs were analyzed by break-even, cost-benefit technique: one for ponderosa pine in the Pacific Northwest, and two for Douglas-fir in the Pacific Northwest-one of low intensity and the other of high intensity. A return of 8 percent on investment appears feasible by using short rotations or by accompanying tree improvement with thinning. Interest rates, length of rotation, the inclusion of thinnings, and site index had greater effects on profitability than program design. Large breeding zones improved profitability, although they incur the biological risks of nonadaptation to local conditions and loss of local genetic resources. Increasing orchard seed yield affected the results only slightly unless the planting program could be expanded, which is equivalent to increasing the size of the breeding zone. If the increase in seed yield merely reduced the required acreage of seed orchard and associated costs, the financial results improved only slightly.
Author: Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.) Publisher: ISBN: Category : Forests and forestry Languages : en Pages : 564
Author: Karl F. Wenger Publisher: John Wiley & Sons ISBN: 0471062278 Category : Nature Languages : en Pages : 1362
Book Description
A revised and reorganized practical reference for the working field forester, incorporating the latest information and new, improved methods in such critical areas as U.S. forest law and policy, forest taxation, cost accounting and accomplishment reporting, pesticide and environmental aspects, safety, and public involvement procedures.
Author: Philip M. McDonald Publisher: ISBN: Category : Clearcutting Languages : en Pages : 796
Book Description
In a 1964-1967 study on the Challenge Experimental Forest, seedfall was evaluated in 2-, 5-, and 10-acre circular clearcuttings. During the 4 years, 10 seed crops, ranging from light to bumper, were produced by ponderosa pine. white fir, Douglas-fir, and incense cedar. Seedfall ranged from 76 to 40,691 sound seed per acre (188 to 100,547/ha) for a single species in a given year. From 89 to 100 percent of each species' seed fell within an area 1 1/2 times the height of the average dominant tree. Overall, seed distribution was highly variable.
Author: Pacific Northwest Forest and Range Experiment Station (Portland, Or.) Publisher: ISBN: Category : Forests and forestry Languages : en Pages : 308
Author: F. Thomas Ledig
Author: F. Thomas Ledig
Author: Leroy C. Johnson
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Author: Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.)
Author: Karl F. Wenger
Author: Philip M. McDonald
Author: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)