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Strobili Development in Western White Pine: Periodicity, Prediction, and Association with Weather

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Variation in yearly counts of female strobili during various stages of development was studied from 18-year records of four trees in northern Idaho. Spectral analyses indicated that periodicity in production of strobili by individual trees followed major cycles of 4 years; cycles of 3 years were of secondary importance. Cospectral analyses indicated that cycles of the four trees were in phase. Autoregression was used to develop models for predicting strobili production. Regressions involving lags of 4 years in the dependent variable accounted for 47 and 41 percent of the variation in counts of immature and mature strobili, respectively. Association of strobili production with daily moisture stress indicated: (1) water deficits during early summer of the year in which strobili matured were directly related to abortion of strobili; (2) moisture stresses during early summer of the first and second years preceding emergence of strobili from the bud scales were associated with high strobili counts; and (3) water deficits during late summer in the year preceding strobili emergence were detrimental to strobili development. Forest Sci. 17:454-461.

Keywords: Pinus monticola; Variance spectrum; cone prediction; cone production; moisture stress; variance cospectrum

Document Type: Journal Article

Affiliations: Principal Plant Geneticist, USDA Forest Service, Intermountain Forest and Range Exp. Sta., Ogden, Utah

Publication date: 1971-12-01

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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