Sökning: "phosphorus"
Visar resultat 26 - 30 av 418 avhandlingar innehållade ordet phosphorus.
26. Predictive Modeling of Lake Eutrophication
Sammanfattning : This thesis presents predictive models for important variables concerning eutrophication effects in lakes. The keystone is a dynamic phosphorus model based on ordinary differential equations. LÄS MER
27. Predicting Ecosystem Response from Pollution in Baltic Archipelago areas using Mass-balance Modelling
Sammanfattning : Baltic archipelago areas have high nature values despite being polluted from various antrophogenic activities within the Baltic Sea catchment area and from long-range transport of airborne substances. The discovery of environmental problems in the Baltic Sea in the 1960s led to countermeasures that gradually gave results in reducing the toxic pollution, e. LÄS MER
28. The Ecophysiology of Arbuscular Mycorrhizal Fungi: Phosphatase Activity Associated with Extraradical and Intraradical Mycelium
Sammanfattning : Arbuscular mycorrhizal (AM) fungi colonise a wide range of plant species and are especially common in soils with a relatively high pH, where phosphorus availability is a limiting factor for primary production. The aim of this thesis was to study the ecophysiology of arbuscular mycorrhizal (AM) fungi when exposed to different environments. LÄS MER
29. Significance and Diversity of Lake Bacteriophages
Sammanfattning : Viruses has a relatively recently been discovered in high abundances in aquatic systems. Their possible importance has therefore been largely overlooked. LÄS MER
30. Appropriate Modelling Complexity: An Application to Mass Balance Modelling of Lake Vänern, Sweden
Sammanfattning : This work is about finding an appropriate modelling complexity for a mass-balance model for phosphorus in Lake Vänern, Sweden. A statistical analysis of 30 years of water quality data shows that epilimnion and hypolimnion have different water quality and should be treated separately in a model. Further vertical division is not motivated. LÄS MER