Master of Science (MS)
First Committee Member
Second Committee Member
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A better understanding of key ecological restoration techniques can inform land management in the Southwest on restoration options for areas infested by invasive grasses that can pose threats to ecosystems, from changes in nutrient cycling to altered fire regimes. In the semi-arid desert of Glen Canyon National Recreation Area (GLCA), several exotic grasses pose risks to local ecosystems: Saccharum ravennae, a relatively new invasive perennial grass, and Bromus rubens and Bromus tectorum, widespread annual grasses. In this study, multiple ecological restoration techniques were implemented to assess their effects on native and nonnative vegetation on sites invaded by the non-native grasses S. ravennae, B. rubens, and B. tectorum. S. ravennae seeds were tested for germinability after periods of water submersion to address how fluctuating water levels of Lake Powell within GLCA may affect the spread S. ravennae. Results showed that S. ravennae populations declined within three months of herbicide treatment and manual removal treatment, but began to return by eleven months post-treatment, suggesting the need for repeated treatments to maintain low populations. Herbicide treatment on B. tectorum and B. rubens did not significantly decrease overall plot non-native cover; however, revegetation treatments yielded higher native plant cover than all other treatments. While shelters and catchments did not significantly affect survival of transplants on all revegetated plots, select plant species had higher survival rates than others. S. ravennae seeds were able to survive up to 16 months underwater, indicating the possibility for S. ravennae to survive periodic flooding and indicating challenges for managing this grass.
Brome; Ecological restoration; Invasive species; Land management; Ravennagrass; Revegetation
Biology | Ecology and Evolutionary Biology | Environmental Sciences | Natural Resources and Conservation | Terrestrial and Aquatic Ecology
Jackson, Simone Ka-Voka, "Effects of Ecological Restoration Techniques in Glen Canyon National Recreation Area" (2019). UNLV Theses, Dissertations, Professional Papers, and Capstones. 3620.