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Filtering by: Creator Silen, Roy R. Rights Statement Copyright Not Evaluated

Lethal surface temperatures and their interpretation for Douglas-fir

Creator:

Silen, Roy R.

Resource Type:

Dissertation
A CLINAL model of tree improvement proposed for Douglas-fir

Creator:

Silen, Roy R.

Abstract:

Keywords: Douglas-fir CLINAL model

Resource Type:

Book
Genetics of Douglas-fir

Creator:

Silen, Roy R. and United States. Forest Service

Resource Type:

Other
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