Am. J. Bot.
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(American Journal of Botany. 2001;88:646-652.)
© 2001 Botanical Society of America, Inc.

Partial cambial mortality in high-elevation Pinus aristata (Pinaceae)1

Andrew J. Schauer 2, 3, Anna W. Schoettle 4 and Richard L. Boyce 2, 5

2Department of Biological Sciences, University of Denver, Denver, Colorado 80208 USA; and 4Rocky Mountain Research Station, Fort Collins, Colorado 80526 USA

Partial cambial mortality is a growth form that is characteristic of Pinus aristata trees. To better elucidate their cambial death pattern, tree size and aspect of cambial death data were gathered from three Pinus aristata forests in central Colorado, USA. Stripping frequency tended to be higher for larger diameter classes. Partial cambial mortality exhibits significant directionality within each stand. Furthermore, cambial death was measured to be most frequent on the wind-exposed side of stripped trees in two of the three study sites and appeared to be at the third. Data presented here support the hypothesis that wind plays a role in the occurrence of partial cambial mortality in Pinus aristata. The mechanisms by which wind causes cambial mortality remain unclear.

Key Words: bark stripping • bristlecone pine • Colorado • partial cambial mortality • Pinus aristata • Rocky Mountains • wind






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