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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