Using tree ring and vegetation measurements, Kaye et al. determined if conifer encroachment and elk browsing have negative impacts on aspen (Populus tremuloides) establishment, growth and survival, as has been previously assumed. Kaye et al. found that conifer encroachment reduced establishment of aspen but did not affect aspen growth or survival while elk browsing reduced aspen establishment and growth but did not affect survival. The combination of conifer encroachment and elk browsing reduced aspen establishment and growth but actually increased survival of the plants because of a reduced amount of aspen mortality from self thinning, which is present in aspen stands without these disturbances. Aspen's response to conifers and elk browsing can also be explained by the species' clonal growth and low tolerance of shade. The results of this study suggest that aspen abundance in the Central Rockies can be improved with enhanced aspen recruitment. Once established, its growth and mortality were resilient to both conifers and browsing over the past century.
Citations and enhanced abstracts for journals articles and documents focused on rangeland ecology and management. RSIS is a collaboration between Montana State University, University of Idaho, and University of Wyoming.