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 20 of 227 for “"boreal"”.
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Boreal tree stem CO2 flux dynamics
Hiilidioksidilla (CO2) on tärkeä rooli puun toiminnassa, sillä sitä tarvitaan fotosynteesissä, käytetään biomassan kasvatukseen ja vapautetaan soluhengityksessä. Puunrungon CO2 vuo koostuu lähinnä soluhengityksestä, minkä vuoksi ilman lämpötilaa voidaan käyttää vuon ennustamiseen. Suurin osa …
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DISTRIBUTED ENERGETICS OF BOREAL FOREST SNOWMELT
The energetics of snowmelt under boreal forest canopies in central Saskatchewan were examined with respect to the influence of forest canopy structure on the snow cover depletionrate. The distribution of snow water equivalent was examined prior to melt and during melt in five distinct boreal forest …
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Differential habitat selection of black bears, gray wolves, and boreal caribou in the Boreal Shield of Saskatchewan
Boreal woodland caribou (Rangifer tarandus caribou) are listed as Threatened on Schedule 1 of the Canada Species at Risk Act, and critical habitat for this species is currently being defined across the country. Declines in populations have been driven largely by anthropogenic disturbance, and in …
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Mapping shrub biomass in a boreal continental fen
… for three dominant shrub genera found in boreal peatlands and found that equations based on shrub genus were not significantly different from a pooled equation of all shrub genera. The UAV study revealed that UAV-derived volume was the best predictor of AGB (R2=0.885) and was subsequently …
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Responses of boreal vegetation to recent climate change
… else in the globe during the past few decades. Boreal ecosystems are responding to this rapid climatic change in complex ways and some times contrary to expectations, with large implications for the global climate system. This thesis investigates how boreal vegetation has responded to recent …
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Drivers of Productivity of Montane and Boreal Breeding Ducks
… site at Red Rock Lakes (RRL) Montana, USA, and a boreal site, the Yellowknife Study Area (YKSA) near Yellowknife, Northwest Territories, Canada. Ducks breeding at these sites have been studied for periods of 9 (RRL, scaup) to 26 (YKSA, multiple boreal duck species) years. I used age-corrected body …
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Technosol evaluation for mine site reclamation in the Boreal Shield
… the reclamation of a gold mine in the Canadian boreal forest. The Technosol plots were constructed in summer 2012 and have been continuously monitored for water chemistry, soil microclimate, and vegetation health. In 2016 soil pits were excavated to examine the physical, chemical, and microbial …
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Selenium uptake, trophic transfer, and toxicity in boreal lake ecosystems
… in cold-water systems, such as Canadian boreal forest lakes. These lakes, which comprise a large proportion of Canada’s freshwater, are also associated with several anthropogenic activities that can contribute to the excess release of Se to aquatic systems. Further, concern about excess …
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Historical growth rates and changing climatic sensitivity of boreal conifers
This thesis is concerned with the expression of relatively long-timescale growth forcing in tree-ring chronologies. The operation of different standardisation techniques, used in dendroclimatology to remove internal, non-climate related growth trends in measured series of ring-widths, is explored …
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Climate change adaptation and sustainable forest management in the boreal forest
… to achieve sustainable forest management in the boreal forest. A logical starting point for climate change adaptation is to proactively identify management practices and policies that have a higher likelihood of achieving management objectives across a wide range of potential climate futures. …
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Fine root dynamics in the Boreal Forest of northern Saskatchewan, Canada
… roots (FR) (roots < 2 mm in diameter) in the boreal forests has become a focus of many forest researchers in the past decade in an effort to better understand belowground processes and improve current carbon (C) models to better predict possible C sinks and sources. The objectives of this …
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Characterizing Boreal Forest Fire Disturbance Boundaries Through Space And Time In Ontario
The Ontario boreal forest contains vast natural resources but is increasingly threatened by wildland fires, which are becoming more frequent and affecting larger areas due to climate change. In response, this thesis compares wildland fire boundaries derived from vegetation index slopes with those …
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Evaluating an ecosystem-based management approach to conserve biodiversity in boreal British Columbia
Biodiversity in boreal British Columbia is threatened. Protecting biodiversity and integrating the conservation of at-risk species, sensitive ecological communities, and cultural diversity in this region is an ongoing challenge. Following a systematic structure based on ecological principles may …
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Developing manufactured soils for reclamation of mined land in the boreal forest ecosystem
… be suitable to create ‘cover islands’ of native boreal vegetation for reclamation of large mine rock piles generated through open-pit mining activities in the Boreal Shield region north of Lake Superior. Multiple Technosols were manufactured from blends of mill derived organic residuals and …
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Clearcut Solutions? An Evaluation of Partial Harvesting in the Black Spruce Boreal Forest
… evaluates partial harvesting in the black spruce boreal forest. Forest management in Ontario is required to emulate natural disturbances, but in regions of the boreal forest where fire cycles are long, regulated even-aged management by clearcutting has truncated forest age-class distributions. …
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Backcasting and Forecasting Boreal Wetland Water Balances Using Weather Data in Reclaimed Landscapes
The oil sands mining industry in Alberta must return mined areas to a land capability equivalent to pre-mining conditions. The landscapes contain wetlands sustained by water balances reflecting prevailing weather conditions. Precipitation and evapotranspiration data that have been collected from …
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