Geographic Variation in Speed of Seed Germination in Central Oregon PonderosaPine ('Pinus ponderosa' Dougl. ex Laws)

摘要

Variation in speed of seed germination was investigated among ponderosa pinetrees 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 short, 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.