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Notes: Eastern Hemlock Allelopathy

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Eastern hemlock (Tsuga canadensis (L.) Carriere) is allelopathic to its own regeneration. Aqueous extracts of hemlock litter caused a 74 percent reduction in seed germination and 100 percent mortality in 6-day-old seedlings of eastern hemlock. Root, mycorrhizal root, and litter extracts, however, had no effect on hemlock seedlings older than 2 weeks. Red oak (Quercus rubra L.) showed a 52 percent reduction and grasses a 10 percent reduction in seed germination due to litter extract treatment. Oak seedlings were not inhibited by litter extracts. Grasses showed significantly greater inhibition of seed germination due to root and mycorrhizal root extracts than to litter extracts. Lettuce (Lactuca sativa L.) seed germination bioassays placed seven hemlock extracts in the following order of inhibition: Root bark > root, mycorrhizal root » litter > stem bark, foliage, soil. Lettuce root growth bioassays placed seven hemlock extracts in the following order of inhibition: Root bark > stem bark, root, mycorrhizal root » litter > foliage, soil. Forest Sci. 28:681-686.
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Keywords: Quercus rubra; Tsuga canadensis

Document Type: Miscellaneous

Affiliations: Assistant Professor of Forest Resources, School of Forest Resources, The Pennsylvania State University, University Park, PA 16802

Publication date: 1982-12-01

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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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