Browse All

Theses & Dissertations

Submissions

Geographical distribution of an 18th-century heart rot outbreak in western juniper (Juniperus occidentalis spp. occidentalis Hook.)

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Paul A. Knapp, Professor (Creator)
Institution
The University of North Carolina at Greensboro (UNCG )
Web Site: http://library.uncg.edu/

Abstract: Between 1749-1730 a widespread occurrence of fungus-caused heart rot affected western juniper in the interior Pacific Northwest, U.S.A. In this study 12 Juniperus occidentalis spp. occidentalis chronologies collected from various sites throughout the western juniper range were examined. The presence of heart rot precluded dating many of these samples prior to the 1730s. Subsequently, sample size decline in these chronologies was examined and it was found that a substantial decrease in chronology sample size was present in nine chronologies, with no other periods exhibiting a decline of equal magnitude. Since heart rot requires open wounds to establish, and the major heart rot episode was confined to a short period, we suspect that a regional-scale climatic event such as a windstorm or icestorm was the initiating cause of this outbreak.

Additional Information

Publication
Journal of Arid Environments
Language: English
Date: 1999
Keywords
heart rot, Juniperus occidentalis spp. occidentalis, Antrodia juniperina, tree-ring chronologies