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  • A pioneer exotic tree search for the douglas fir region

    Creator:
    Silen, Roy R. and Olson, Donald L.
    Abstract:
    After three-quarters of a century of introduction of 152 conifer and broadleaf species, no promising candidate exotic was found for the Douglas-fir region. Growth curves spanning 50 years or longer are figured for many species. Firs, pines, larches, spruces, hemlocks, and cedars originating in northwestern North America had superior growth...
    Resource Type:
    Other
    Full Text:
    genetic trends to run their course. And second, it is on an average Cascade forest site with a typically

  • Genetic variation in Douglas-fir : a 20-year test of provenances in eastern Nebraska

    Creator:
    Van Haverbeke, David F., 1928-
    Abstract:
    Twenty-year-old Douglas-fir trees in provenances from Arizona, New Mexico, and southern Colorado survived better and grew taller; but incurred more winter injury in eastern Nebraska than trees from provenances from northern Colorado, southern and western Montana, northern Idaho, Canada, and eastern Washington. However, surviving trees from Pacific Coast, and northern...
    Resource Type:
    Technical Report
    Full Text:
    United States Department of Agriculture Forest Service