Browsing Doctoral theses (IMV) by Issue Date
Now showing items 1-20 of 24
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Effects of conversion of natural forest to plantations, traditional agroforestry and cultivated lands on carbon sequestration and maintenance of soil quality in Gambo district, Southern Ethiopia
(PhD Thesis;2009:40, Doctoral thesis, 2009)Clearing and conversion of natural forest to short rotation plantation, traditional agroforestry, crop and grazing land uses are rampant in Ethiopia. The unabated deforestation and the eventual reduction in soil productivity ... -
Ecotoxicological effects of highway and tunnel wash water runoff
(PhD Thesis;2010:25, Doctoral thesis, 2010)In Norway, the traffic loadings have shown a substantial increase during the last decades. From 1948 to 2008 the transportation load has increased from 2.5 to 60.6 million passenger km. Hence, the ever increasing traffic ... -
In vivo studies of respiratory physiology in Arctic charr (Salvelinus alpinus) and Atlantic cod (Gadus morhua) exposed to aquaculture relevant levels of hypoxia, hyperoxia and hypercapnia
(PhD Thesis;2010:34, Doctoral thesis, 2010)Fish in aquaculture will be exposed to water oxygen and carbon dioxide levels that they do not normally encounter in the wild. These unnatural environmental conditions may be challenging to fish as they may lack the proper ... -
Sheep grazing effects on soil carbon and nitrogen and implications for runoff water quality at a low alpine site in southern Norway
(2011;2011:10, Doctoral thesis, 2011)Grazing in outlying fields has a long history and is important in local communities worldwide. Alpine ecosystems, representing a large proportion of the land area in Europe, are under pressure from changes in climate and ... -
Trace metal availability in soils under different land uses of the Danube basin in Croatia
(PhD Thesis;2011:65, Doctoral thesis, 2011)Soils are non-renewable resource of biological, chemical and physical properties. One of the ecological functions of the soil is its capacity to filter and buffer trace metals. Trace metals can pose a threat on the one ... -
Variability and uncertainty in soil physical properties : effects of data source on functional criteria
(PhD Thesis;2011:40, Doctoral thesis, 2011)Modeller har blitt uunngåelige verktøy for en lang rekke problemstillinger knyttet til landbruk og miljø. Samtidig er modellering forbundet med usikkerhet, noe som kan ha konsekvenser når beslutninger skal fattes. En av ... -
Modeling organic matter decomposition and nitrogen dynamics in agricultural soils : Environmental impacts of plant production systems
(PhD Thesis;2011:69, Doctoral thesis, 2011)Agricultural plant production has negative environmental impacts such as nitrate leaching and emissions of greenhouse gasses (N2O and CO2). Both phenomena are affected by the decomposition of soil organic matter and plant ... -
Disentangling the effect of physical and chemical factors on phytoplankton dynamics in a highly eutrophic and turbid lake
(PhD Thesis;2012:11, Doctoral thesis, 2012)The fact that nutrients limit primary production in aquatic ecosystems is widely accepted, and phosphorus is demonstrated as the main limiting nutrient in freshwaters. Strict control of phosphorus supply has therefore ... -
Source identification of Pu and 236U deposited on Norwegian territories
(PhD Thesis;2013:56, Doctoral thesis, 2013)Plutonium (Pu) is a predominately anthropogenic element produced during neutron irradiation of U in reactors and nuclear weapon detonations. Pu has been released to the environment during nuclear weapon detonations, nuclear ... -
Environmental impact of radionuclides and trace elements in the thorium rich Fen area in Norway
(PhD Thesis;2014:26, Doctoral thesis, 2014)The Fen Complex which is situated in the south of Norway, represents a magmatic bedrock area enriched in thorium (Th), iron (Fe), niobium (Nb) and rare earth elements (REE), and is well known for the elevated levels of ... -
Soil quality and carbon footprint of different land uses by smallholder farmers in Ethiopia
(PhD Thesis;2014:70, Doctoral thesis, 2014)In Ethiopia, deforestation of natural forests and extensive use of agricultural lands have resulted in soil degradation. Despite recent massive restoration measures implemented on degraded landscapes, nowhere in the country ... -
Impact of biochar on soil physical characteristics and greenhouse gas emissions
(PhD Thesis;2015:100, Doctoral thesis, 2015)Climate change and production of adequate amounts of food to feed the growing human population are key challenges facing the modern world. These two challenges often involve a trade-off between solving the one, while ... -
Applicability of natural porous materials and lime with conditioning and sorption properties for wastewater treatment
(PhD Thesis;2016:77, Doctoral thesis, 2016)Urban wastewater streams are produced in large quantities and removal of contaminants is required for compliance with environmental regulations. The water separation, concentration of particles as solid phases (e.g., ... -
Geochemistry and availability of barium (Ba) to plants grown in soils with ordinary and Ba-enriched mineralogy
(PhD Thesis;2016:71, Doctoral thesis, 2016)In recent years there has been an increasing interest for the use of crushed minerals and rocks as soil amendment and slow-release fertilizers in agriculture. Apatite-biotite-carbonatite (short form: carbonatite) rock from ... -
Evaluation of primary rainbow trout (Oncorhynchus mykiss ) hepatocytes suitability as a screening assay for estrogen receptor agonists
(PhD Thesis;2016:47, Doctoral thesis, 2017-07-12)Regulatory legislations on chemicals have in recent years become more stringent, requiring more toxicological evaluation. The increased toxicological testing have resulted in a stronger effort to implement the 3Rs (Refinement, ... -
Constructed wetlands for wastewater treatment in Nepal
(PhD Thesis;2015:47, Doctoral thesis, 2017-07-12)As a result of rural to urban migration over the past five decades small towns are rapidly emerging particularly along the major road network in Nepal. These small towns lack resources and basic infrastructure to accommodate ... -
The recycling potential of phosphorus in secondary resources
(PhD Thesis;2016:35, Doctoral thesis, 2017-07-12)Mineable rock phosphate is a limited resource. Replacing mineral phosphorus (P) fertilizer with P-rich secondary resources is one way to manage P more efficiently. The Norwegian potential to replace mineral P fertiliser ... -
Exploring the regulation of denitrification and NO and N2O kinetics in Paracoccus denitrificans using simulation modelling
(PhD Thesis;2015:59, Doctoral thesis, 2017-07-12)In the environment, microbes frequently experience lack of oxygen. In response, certain microorganisms produce enzymes that enable them to respire molecules other than O2 (anaerobic respiration). (...) Denitrification is ... -
Road deicing salt and copper : transfer and effects on fertilization and early life history stages of Atlantic salmon (Salmo salar)
(PhD Thesis;2015:66, Doctoral thesis, 2017-07-12)Application of road deicing salt in the Nordic countries have increased considerably over the years, in order to enhance good friction and thereby increasing the traffic safety on icy roads during the winter period. The ... -
Learning from the past : using lake sediments as chemical and biological archives
(PhD Thesis;2015:27, Doctoral thesis, 2017-07-12)This thesis advances the analysis of the organic fraction of sediment to reconstruct lake history using DNA fragments and algal pigments in combination with available monitoring data. These methods were tested in southern ...