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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
41

Evaluating the success of revegetated metalliferous mine tailings in Manitoba and Saskatchewan

Naguit, Christian January 2013 (has links)
Revegetation is employed to mitigate the spread of mine tailings in the environment by ameliorating tailings with organics to promote plant cover. Revegetation has proven to be successful in establishing plant cover, but the long-term effects are largely unknown. A field study was conducted to evaluate the success of four artificially revegetated tailings from Manitoba by comparing plant cover and diversity. Central Manitoba, Flin Flon, and Thompson had moderate cover while cover was low in Lynn Lake. All four sites had low diversity and were composed of early-successional species. The results suggest that while current revegetation methods promote plant growth on tailings, it is currently difficult to determine if and how the vegetation will progress from a grass-legume community to a boreal forest. In addition, while various amounts of effort were invested into each site, the results indicate the degree of remediation does not affect overall success.
42

Littoral macroinverterbrates in relation to native and exotic riparian vegetation in streams of central Victoria, Australia

Jayawardana, Chandamali January 2006 (has links)
"Exotic willows (Salix spp.) are widespread riparian tree species of streams in temperate Australian and New Zealand. In Australian willow speicies are declared weeds of national significance, yet little is known about the novel habitats they create not the impact on aquatic biota of vegetation change following willow management programs ..." [leaf i] / Doctor of Philosophy
43

Mine and industrial site revegetation in the semi-arid zone, North-Eastern Eyre Peninsula, South Australia /

Atkinson, Victoria L. Unknown Date (has links)
The vegetation rehabilitation of iron ore waste dumps and industrial site waste is an important part of completion criteria for mining, especially as legislation requirements increase. There are limited guidelines currently available for companies to achieve these rehabilitation goals and those that exist tend to be anecdotally rather than scientifically based. Some scientific studies have been carried out using topsoil and seeding as restoration treatments, but very little information is available on their usefulness in the arid zone. This study assesses the outcomes of a range of rehabilitation projects carried out in the Middleback Ranges, South Australia. / For historical sites, data was collected by line transects and point quarter (i.e they were quantitative and repeatable even if the design was historical). These projects were not originally designed for scientific purposes, so are not controlled or replicated. Therefore data was collected in a descriptive, non-experimental and interpretive manner. Similar data was also gathered, at nearby reference sites (unmined areas) of similar landform to gauge the success of the revegetation. / The historical study showed that long-term monitoring using scientific protocol is the only reliable method of gauging rehabilitation success and may be crucial in deciding completion criteria in the future, whereas ad-hoc restoration with no written records is of limited use to restoration science. However, the historical study did provide an opportunity to discuss rehabilitation success over a longer period than would normally be included in a short study. / A controlled and replicated field - based experiment testing both topsoil and seeding treatments was designed for the Iron Baron mine site, in the Middleback Ranges. A second experiment testing only the seeding treatment was carried out at the Whyalla Steelworks. At Iron Baron mine site ten contour terraces were built which provided 20 transects, allowing five replicates of treatments: topsoil and seed; topsoil and no seed; no topsoil and seed; and no topsoil and no seed. At the Whyalla Steelworks ten transects were furrowed, allowing five replicates of topsoil with seed and five of topsoil with no seed. At both experimental sites line transects were conducted which measured percentage cover, density and canopy volume of emerging vegetation cover. Each measure of vegetation response from each experiment was modelled using spatial analysis of mixed models (SAMM). / The experimental trials confirmed the hypothesis that there is a significant difference in revegetation using topsoil and seeding treatments. Topsoil with seed provided the most superior result. Increases in cover, density, canopy volume and biodiversity proved that both these treatments were effective for the arid zone. Should only one treatment be possible then topsoiling is the more effective option. / Thesis (MAppSc(EnvironmentRecreationMg))--University of South Australia, 2003.
44

Littoral macroinverterbrates in relation to native and exotic riparian vegetation in streams of central Victoria, Australia

Jayawardana, Chandamali . University of Ballarat. January 2006 (has links)
"Exotic willows (Salix spp.) are widespread riparian tree species of streams in temperate Australian and New Zealand. In Australian willow speicies are declared weeds of national significance, yet little is known about the novel habitats they create not the impact on aquatic biota of vegetation change following willow management programs ..." [leaf i] / Doctor of Philosophy
45

Use of saline wastewater for revegetation and creation of wildlife habitat.

Fitzsimmons, Kevin Michael January 1999 (has links) (PDF)
Thesis (Ph. D. - Renewable Natural Resources)--University of Arizona, 1999. / Includes bibliographical references (leaves 134-138).
46

The effects of site preparation on native forb establishment in a wet prairie, Willamette Valley, Oregon /

Norman, Katherine N. January 1900 (has links)
Thesis (M.S.)--Oregon State University, 2008. / Printout. Includes bibliographical references (leaves 40-46). Also available on the World Wide Web.
47

Vegetation trends after wildfire on sagebrush/grass and shadscale plant communities in north-central Nevada

Bollinger, Ann P. January 2007 (has links)
Thesis (M.S.)--University of Nevada, Reno, 2007. / "December, 2007." Includes bibliographical references (leaves 61-68). Online version available on the World Wide Web.
48

Sustainable restoration of mine sites : a thesis submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy at Lincoln University /

Krisnayanti, Baiq Dewi. January 2009 (has links)
Thesis (Ph. D.) -- Lincoln University, 2009. / Also available via the World Wide Web.
49

Revegetation of disturbed semiarid grassland in Canyonlands National Park /

Goldberg, Susan B. January 1993 (has links)
Thesis (M.S.)--Oregon State University, 1994. / Typescript (photocopy). Includes bibliographical references (leaves 48-56). Also available on the World Wide Web.
50

Seed rain and selected species germination and growth trials : implications for natural and augmented revegetation of post-dam Elwha River floodplain and reservoir sediments /

Michel, James T. Helfield, James M. January 2010 (has links)
Thesis (M.S.)--Western Washington University, 2010. / Includes bibliographical references (leaves 31-36). Also issued online.

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