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Water Potential and Temperature Effects on Germination of Engelmann Spruce and Lodgepole Pine Seeds

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The effects of water stress and temperature on seedling emergence from soil or germination in solutions were studied with Engelmann spruce and lodgepole pine. Seed emergence or germination was reduced by low water potentials both in soil and in polyethylene glycol solutions. Emergence from soil was about equal at 16° and 25°C but reduced at 35°C. The time lags before initial emergence or germination were similar for both species, and low water potentials resulted in longer time lags. However, the time required for 25 percent emergence at 16°C was about 2 days longer for pine than for spruce. These data suggested that Engelmann spruce establishment may occur more rapidly than that of lodgepole pine in cool environments. Seedling emergence was similar using 2 nursery soils which differed widely in their effects on subsequent seedling growth. Forest Sci. 23:27-33.

Keywords: Picea engelmannii; Pinus contorta; water stress

Document Type: Journal Article

Affiliations: Staff Research Associate, Department of Plant Sciences, University of California, Riverside

Publication date: March 1, 1977

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