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Chemical Composition of the Sapwood of Four Tree Species in Relation to Feeding by the Black Bear

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The contents of sugars, nitrogen, and mineral elements, and the kinds of sugars and soluble nitrogenous compounds in the sapwood of 20- to 30-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), western hemlock (Tsuga heterophylla (Raf.) Sarg.), western redcedar (Thuja plicata Donn), and red alder (Alnus rubra Bong.) were determined on two areas in western Washington. One area was subject to considerable tree damage by black bear (Euarctos americanus Pallus) and the other showed very little damage. On both areas, there were significant differences among species in contents and kinds of some chemical constituents, but total sugars and ash were the only components which seemed to be related to bear preference. There were only minor differences within species between the two areas, however. Chemical analysis alone, therefore, was not sufficient to explain the problem of bear feeding on tree sapwood.
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Keywords: Alnus rubra; Euarctos americanus; Pseudotsuga menziesii; Thuja plicata; Tsuga heterophylla; animal damage; carbohydrate content

Document Type: Journal Article

Affiliations: Principal Plant Physiologist, Forestry Sciences Laboratory, Pacific Northwest Forest and Range Expt. Sta., Forest Service, U.S. Dept. of Agric., Olympia, Wash.

Publication date: 1969-03-01

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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.
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    June 1, 2016 to Feb. 28, 2017

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