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Visar resultat 1 - 5 av 46 avhandlingar som matchar ovanstående sökkriterier.
1. Essays on Shocks, Welfare, and Poverty Dynamics: Microeconometric Evidence from Ethiopia
Sammanfattning : Five self-contained papers constitute this thesis. Paper 1: Does fertilizer use respond to rainfall variability? Panel data evidence from urban Ethiopia In this article, we use farmers’ actual experiences with changes in rainfall levels and their responses to these changes to assess whether patterns of fertilizer use are responsive to changes in rainfall patterns. LÄS MER
2. Nitrogen land-sea fluxes in the Baltic Sea catchment : Empirical relationships and budgets
Sammanfattning : In this thesis empirical relationships and modeling tools are used to describe the relationship between human activities and meso- and large scale riverine N fluxes from land to sea. On a large scale Paper I showed that by only having knowledge about human population size and runoff one can estimate the riverine export of DIN (r2= 0.76). LÄS MER
3. Phosphorus : flows to swedish food chain, fertilizer value, effect on mycorrhiza and environmental Impact of Reuse
Sammanfattning : Phosphorus is an essential element for plants, animals and humans and is also a scarce resource as a raw material for fertilizer production. The flows of phosphorus to and from Swedish agriculture and food chain was investigated with a material flow analysis (MFA). LÄS MER
4. European ecosystems on a changing planet : Integrating climate change and land-use intensity data
Sammanfattning : Dynamic global vegetation models are mathematical models that provide a bottom-up description of plant communities. They explicitly model physiological and population-level processes such as growth, photosynthesis, carbon allocation, regeneration and mortality. LÄS MER
5. Risk, Time and Land Management under Market Imperfections: Applications to Ethiopia
Sammanfattning : This Ph.D. thesis addresses both theoretical and empirical issues pertaining to land management decisions of farm households in developing countries working under an imperfect market and institutional setting (with case studies from Ethiopia). LÄS MER