Geographic variation in speed of seed germination in central Oregon ponderosa pine (Pinus ponderosa Dougl. ex Laws.).

John C. Weber; Frank Sorensen

doi:10.2737/PNW-RP-444

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Geographic variation in speed of seed germination in central Oregon ponderosa pine (Pinus ponderosa Dougl. ex Laws.).

Informally Refereed

Authors:

John C. Weber, Frank Sorensen

Year:

1992

Type:

Research Paper

Station:

Pacific Northwest Research Station

DOI:

https://doi.org/10.2737/PNW-RP-444

Source:

Res. Pap. PNW-RP-444. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 12 p

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Abstract

Variation in speed of seed germination was investigated among ponderosa pine trees representing 225 locations in central Oregon. Results suggested that at least some of the geographic variation is related to the severity of summer drought. In general, germination speed was greater in locations with shod, drought-limited growing seasons. Levels of geographic variation were highest in the region having the steepest precipitation gradients. Most of the variation occurred, however, within locations.

Keywords

Geographic variation, seed germination, ponderosa pine, adaptation, drought, central Oregon

Citation

Weber, John C.; Sorensen, Frank C. 1992. Geographic variation in speed of seed germination in central Oregon ponderosa pine (Pinus ponderosa Dougl. ex Laws.). Res. Pap. PNW-RP-444. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 12 p