Graduate Thesis Or Dissertation
 

The population dynamics and growth of salmonberry (Rubus spectabilis) and thimbleberry (Rubus parviflorus)

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/pz50h037c

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  • Salmonberry (Rubus spectabilis) and thimbleberry (Rubus parviflorus) are clonal shrub species common to reforestation sites in the Oregon Coast Range. These species have economic importance, because they reduce conifer seedling growth and survival. A population modeling approach was used to facilitate study of the biology of these species and to assess management practices. A generic Rubus transition matrix model was developed from the literature and used to generate hypotheses and focus research on demographic processes governing population dynamics. Sensitivity analysis on the model indicated that transition from basal buds to sprouts, shoot survival, sprout transition to mature vegetative shoots, and basal bud production on mature vegetative shoots were important processes influencing population growth. High basal bud production potential and sprout survival and growth relative to seedlings indicated that populations should be dominated by sprouts rather than seedlings. Density-biomass relationships conformed to the constant final yield theory. The influence of density on demographic processes was inconsistent over time and sites indicating that the intensity of competition is not constant. Therefore, density-dependence is a dynamic population growth regulating mechanism. The model was refined by incorporating the species specific influence of phenology, environments at different sites, and intraspecific density on demographic processes. Population simulations were compared with observations on planted and adjacent wild populations for the first three growing seasons. An average of 71% of the variation in observed planted population and 81% in wild population shoot dynamics was accounted for by the simulations. Canopy cover and height growth were simulated in the model as a function of density. Simulations of a herbicide treatment and manual cutting demonstrated the utility of the model for evaluating salmonberry and thimbleberry management tactics.
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