Dating Decline and Mortality of Chamaecyparis nootkatensis in Southeast Alaska

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Abstract:

Alaska yellow-cedar (Chamaecyparis nootkatensis (D. Don) Spach) has been declining and dying for a long, but undetermined, span of time in remote and undisturbed forests of southeast Alaska. Aerial photographs indicate mortality was widespread by 1927. The dates of death for individual snags of Alaska yellow-cedar were determined by counting annual rings on 73 western and mountain hemlock trees growing beneath larger, dead Alaska yellow-cedars, and in live callus strips on 46 Alaska yellow-cedars with partial bole death. Average time since death was 4, 14, 26, 51, and 81 years for snags in class I (foliage retained), class II (twigs retained), class III (secondary branches retained), class IV (primary branches retained), and class V (bole intact but no primary branches retained), respectively. Class V snags, which are common on all sites currenty expressing decline, appear to represent the trees initially affected. Snags in a sixth class with deteriorating boles are uncommon and not associated with sites of decline; their death most likely predated the onset of extensive mortality. Because some class V snags died over 100 years ago, these data suggest that extensive mortality began about 1880, and became obvious about 1900-1910--dates supported by historical records. For. Sci. 36(3):502-515.

Keywords: Alaska-cedar; Yellow-cedar; aerial photography; release

Document Type: Journal Article

Affiliations: Professor, Botany and Plant Pathology, Oregon State University, Corvallis, OR 97331

Publication date: September 1, 1990

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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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