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Visar resultat 1 - 5 av 13 avhandlingar som matchar ovanstående sökkriterier.
1. Nitrogen Losses from a Clay-rich Soil used for Cereal Production in south-western Sweden
Sammanfattning : Addition of fertiliser nitrogen (N) in crop production increases yields and protein contents, but all is not taken up by the crop. Instead, some of the N is lost to air and waters, contributing e.g. to climate change, stratospheric ozone depletion, eutrophication and acidification. LÄS MER
2. Soil tillage influences on soil mineral nitrogen and nitrate leaching in Swedish arable soils
Sammanfattning : Leaching of nitrogen (N) is an unwanted effect of agriculture practices which contributes to eutrophication of surface waters. This thesis examined how soil tillage practices affect leaching losses of N from arable fields. LÄS MER
3. Uptake of and Preference for Nitrate, Ammonium and Amino Acids by Understory Species in Deciduous Forests
Sammanfattning : AbstractThe uptake of different nitrogen forms by understory species was studied in field and laboratory. Species of the understory in deciduous forests have previously been thought to take up and assimilate only inorganic nitrogen sources. LÄS MER
4. Nitrogen in soil water of coniferous forests : effects of anthropogenic disturbances
Sammanfattning : In boreal and temperate forests, long-term elevated nitrogen (N) load may eventually saturate forest ecosystems with N, i.e. total N ecosystem input exceed ecosystem sinks for N, and N losses via soil water transport may then increase and negatively impact environmental quality. LÄS MER
5. Land use GHG emissions and mitigation options, simulated by CoupModel
Sammanfattning : Climate change and greenhouse gas (GHG) emissions are one of the major challenges to the humankind of 21st Century. This thesis focuses on understanding, estimating and suggesting mitigation of the GHG emissions (mainly N2O and CO2) from the land use sector, specifically from forest ecosystems on drained peatlands but also from willow production on agricultural clay soil. LÄS MER
