Relict aspen stand at Bighorn Canyon National Recreation Area, Montana

Stevens, Joseph; Decker, Karin; Morrison, Beth

This report details the location, description and condition of an isolated aspen (Populus tremuloides) stand near Dry Head Creek in Bighorn Canyon National Recreation Area. The stand is located on the edge of a dry plateau, but is fed by a groundwater spring. The stand was discovered during vegetation inventory and mapping field sampling efforts in 2011 and was previously un-documented. It is unique in that it occurs outside of the documented range of quaking aspen in that region. The origin of this stand is unknown, and the leaf shape suggests individuals may be rare P. tremuloides and P. deltoides hybrids. Thus, the stand is of interest for further genetic analysis. There is evidence of intense browsing pressure in the stand as well as disease and insect damage. There is minimal aspen regeneration within the stand, and Rocky Mountain juniper (Juniperus scopulorum) appears to be encroaching, possibly due to long-term fire suppression in the area. This BICA aspen stand between the Bighorn and Pryor mountains is of interest because it is an isolated stand in an area not previously identified as being part of the species’ distribution. Additional research is needed to document the genetic diversity and resource value of the stand and to inform appropriate management actions. Further study to document the genetic diversity of these stands could provide valuable information to genetic preservation efforts, breeding programs, or restoration efforts. Suggested near-term management considerations include managing browsers and removing competition from juniper trees within the stand.

Relict aspen stand at Bighorn Canyon National Recreation Area, Montana

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