Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"Invasive grasses"”.
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Developing Techniques to Quantify Phenological Development of Smooth Brome (Bromus inermis Leyss.): Sampling Variability
Management of invasive grasses such as smooth brome (Bromus inermis Leyss.) and Kentucky bluegrass (Poa pratensis L.) is a critical issue for land managers in the Northern Great Plains. Recent surveys of US Fish and Wildlife Service (USFWS) grasslands revealed fragments of native prairie and …
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Interplay between competition and evolution in invaded and native plant communities
… interactions between Euphorbia esula, an invasive plant, and Balsamorrhiza sagittata, a native plant. I found that direct negative effects of Euphorbia on Balsamorrhiza, due to competition, were greatly reduced by indirect positive effects. In the second chapter, I investigated whether …
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Interplay between competition and evolution in invaded and native plant communities
… interactions between Euphorbia esula, an invasive plant, and Balsamorrhiza sagittata, a native plant. I found that direct negative effects of Euphorbia on Balsamorrhiza, due to competition, were greatly reduced by indirect positive effects. In the second chapter, I investigated whether …
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Exploring the mechanisms and impacts of plant invasions in grasslands
… rate. Many of these non-native species become invasive by spreading across their introduced ranges and impacting native biota, ecosystems and human societies. However, the impacts of the majority of non-native plant species remain unquantified. Moreover, the mechanisms that underpin the spread …
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Mojave Desert restoration: drought and facilitation influences on plant communities and soil seed banks in annual grass invaded shrublands
Non-native grasses, like Bromus rubens, have become widespread in arid ecosystems across the western United States, including the Mojave Desert. Their prolific seed production and rapid spread pose significant threats to native flora and wildlife habitats. These invasive grasses alter fire cycles, …
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Palaeoecology and vegetation dynamics in the Cederberg wilderness area
… allowed the invasion and persistence of exotic grasses which now make up 43% of total grass cover on the previously ploughed area. Few indigenous fynbos grasses were found suggesting that the grass community is depauperate due to disturbance. The higher grass abundance preceded the largest fire …
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Responses of Above- and Belowground Forb and Plant Species Diversity to Grazing Exclusion and Fire in the Northern Great Basin Sagebrush Steppe
… decrease in native deep-rooted perennial bunch grasses and forbs, an increase in annual invasive grasses, and greater sagebrush dominance. Although not as widely used as perennial bunchgrasses, forbs of the Intermountain west have also been tested for use in rehabilitation purposes in the …
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The effects of fire and drought on plant-soil feedbacks of a nonnative invasive grass in southern Illinois
… plots exposed to repeated burning had lower invasive grass productivity, higher root:shoot ratio, and higher C:N ratio in plant tissues and soil microbial biomass. The results presented here suggest that invasion by grasses like M. vimineum may increase the potential for N loss during fire, …