Sökning: "agriculture and environment"
Visar resultat 1 - 5 av 186 avhandlingar innehållade orden agriculture and environment.
1. Agricultural nutrient budgets in Europe: data, methods, and indicators
Sammanfattning : Agricultural production systems feed humanity but also cause a range of adverse environmental effects, including climate change, loss of biodiversity, and pollution of air and water. A main cause of these effects is the emissions of nitrogen (N) and phosphorus (P) that occur as a side effect of nutrient cycling in agriculture. LÄS MER
2. Human factors in mechanized cut-to-length forest operations
Sammanfattning : Although forest operations research has a more than 50-year-long tradition in the field of human factors, there is a current decline in resources put on continuous and systematic human factors research. Therefore, the overall aim of this thesis was to contribute new knowledge on working conditions in mechanized cut-to-length logging operations and their relationship to system performance. LÄS MER
3. Behaviour and metabolic rates of brown trout and Atlantic salmon : Influence of food, environment and social interactions
Sammanfattning : For Atlantic salmon (Salmo salar) and brown trout (Salmo trutta), the decision to migrate or when to migrate is believed to be influenced by the individual’s metabolic rate (MR) relative its food intake. As MR was expected to be related to behaviour, the potential links between behaviour and metabolic costs was studied. LÄS MER
4. Nitrous oxide and methane emissions from storage and land application of organic fertilisers : with the focus on sewage sludge
Sammanfattning : Organic fertiliser handling contributes to greenhouse gas emissions. Through storage and field experiments, this thesis examined strategies to reduce emissions of nitrous oxide (N2O) and methane (CH4) from storage and after land application of cattle slurry (CS) and sewage sludge (SS). LÄS MER
5. The Burden of Responsibility : Predicaments of Environmental Life in the Caraballo Mountains, Northern Philippines
Sammanfattning : Indigenous people are not obviously, or naturally, stewards of the environment. But when the idea that they are such custodians gains legal traction, and when indigenous land-use practices are codified to reflect environmental principles, they become a burden of responsibility that has significant consequences for the lives and the livelihoods of indigenous communities. LÄS MER