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    Author(s): Gabriel Toval Hernandez; Guillermo Vega Alonso; Gonzalo Puerto Arribas; James L. Jenkinson
    Date: 1993
    Source: Gen. Tech. Rep. PSW-146. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. 43 p
    Publication Series: General Technical Report (GTR)
    Station: Pacific Southwest Research Station
    PDF: Download Publication  (3.8 MB)


    Douglas-firs from 91 seed sources in North America were evaluated after 5 and 6 years in 15 common-garden tests in the mountainous regions of northwest and north central Spain. Analyses of tallest trees showed that most of the sources of highest potential for reforestation in Spain are found in regions where the Pacific Ocean air mass dominates climate. Fast growers came from coastal slopes of the Coast Ranges from northwest California to the Georgia Strait of southwest British Columbia and inland slopes of the Olympic Mountains and Coast and Cascade Ranges facing the Puget Trough in western Washington and Willamette Valley in northwest Oregon. Slow growers came from latitudes south of 44° and north of 50° N, high altitudes west of the crest of the Cascade Ranges, and regions east of the crest where the continental air mass dominates climate.

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    Toval Hernandez, Gabriel; Vega Alonso, Guillermo; Puerto Arribas, Gonzalo; Jenkinson, James L. 1993. Screening Douglas-fir for rapid early growth in common-garden tests in Spain. Gen. Tech. Rep. PSW-GTR-146. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. 43 p


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    Climatic adaptation, genetic variation, genotype-environment interaction, species introduction, tree growth, Pseudotsuga menziesii, P. flahaulti, P. macrolepis

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