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Influence of High Light Intensity on Survival of Planted Engelmann Spruce

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Results of three studies on photosynthesis and needle water deficits are presented. Photosynthesis was higher for Engelmann spruce seedlings grown in the shade than in the open, but it was not significantly different for lodgepole pine seedlings. Spruces reached near-maximum photosynthesis at 4,000 to 5,000 ft-c, but pines did not appear light-saturated even at 12,000 ft-c. Photosynthesis and respiration of potted spruce seedlings were highest at moisture deficits less than 10 percent; with deficits above 20 percent, photosynthesis was zero and respiration minimal. At a deficit of 58 percent seedlings died. Moisture deficits of seedlings during the summer after field planting were below 31 percent and did not differ significantly between sunrise or mid-afternoon measurements, nor between shaded or open-grown treatments. These and other results suggest that solarization occurs in unshaded spruce, has a deleterious effect on photosynthesis, and may be associated with the high mortality in plantations at elevations above 10,000 ft. Forest Sci. 16: 331-339.

Keywords: Picea engelmannii; Pinus contorta; leaf water deficit; photosynthesis; respiration; solarization

Document Type: Journal Article

Affiliations: Silviculturist, Rocky Mountain Forest and Range Exp. Sta., USDA Forest Service

Publication date: September 1, 1970

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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