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Analysis of Early Mortality of Douglas-Fir Seedlings in Postharvest Plantings in Northwestern California

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A life table study was conducted of injury and mortality of Douglas-fir seedlings in 44 plantations on public and private lands in Humboldt and Del Norte Counties, CA. Field examinations were made three times each year for the first 3 years following planting. Apparent and real mortalities were compiled in life table format for nine time intervals. Seedling mortality per time interval in the different ownerships varied from 0 to 35.0% in real percentage terms, and totalled 14.0 to 70.7%. Highest mean mortality occurred in intervals 2 and 3 (late spring to fall, first year). Trend analyses, using a curvilinear regression model, showed significant differences in rates of mortality among ownerships. The performance of containerized and bareroot seedlings was very similar. Primary conclusions from the life table analyses, using a two-step modeling process, were (1) variations and covariations in mortality associated with intervals 2 and 3 were most important in determining total variation in survival in the 3-year period; intervals 1, 4, 7, and 9 also were critical in some instances; (2) planting- and weather-related factors were most important in intervals 1-4; disease, insects, and animals, alone and jointly, were more important in the second and third years; (3) substantial covariations in mortality among the time intervals indicated carryover effects; covariations among certain categories of causal factors indicated strong positive or negative interactions that either added to or dampened the direct effects of these factors. For. Sci. 37(3):802-826.
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Keywords: Life table analysis; disease; insects; planting; trend analysis

Document Type: Journal Article

Affiliations: Professor, Department of Plant Pathology, University of California, Berkeley

Publication date: 1991-08-01

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  • 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.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
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