Search for dissertations about: "biogeochemistry"

Showing result 1 - 5 of 51 swedish dissertations containing the word biogeochemistry.

  2. 1. Biogeochemistry in Subarctic birch forests : Perspectives on insect herbivory

    Author : Jeppe Ågård Kristensen; MERGE: ModElling the Regional and Global Earth system; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biogeochemistry; Aboveground-belowground interactions; Herbivory; Insects; Subarctic; Birch; soil microbes;

    Abstract : Herbivory can influence ecosystem processes, partly through long-term changes of the plant community compositions, but also more rapidly through the herbivores’ digestive alteration of the organic matter that is cycled through the soil and back to the primary producers. In the Subarctic mountain birch (Betula pubescens ssp. READ MORE

  4. 2. Drivers of increasing iron concentrations in freshwaters

    Author : Caroline Björnerås; Enhet akvatisk ekologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Järn; Akvatisk ekologi; Biogeokemi; Brunifiering; Iron; Freshwaters; Biogeochemistry; Brownification; Iron biogeochemistry; Browning; Freshwaters;

    Abstract : Iron (Fe) concentrations are increasing in freshwaters (lakes and streams) in Sweden, as well as in other regions in northern Europe. Together with increasing concentrations of organic matter, Fe is contributing to the ongoing browning of freshwaters, which may have serious ecological consequences and implications for ecosystem services. READ MORE

  5. 3. Northern peatland carbon biogeochemistry : the influence of vascular plants and edaphic factors on carbon dioxide and methane exchange

    Author : Mats Öquist; Bo Svensson; Joseph B. Yavitt; Linköpings universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Biogeokemi; Biologi; Autekologi; Klimatologi; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Abstract : The interest in carbon dynamics and the interactions between ecosystems and the atmosphere has increased during the last decade due to the postulated threat of anthropgenically induced global and climate change. Northern peatlands, with their large stores of organic carbon and long-term net accumulation of atmospheric carbon dioxide are key ecosystems in these interactions. READ MORE

  6. 4. The role of sediments in the biogeochemical cycles of nutrients in the Gulf of Riga

    Author : Juris Aigars; Matti Perttilä; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biogeochemistry; biogeokemi;

    Abstract : The sediment biogeochemistry of C, N, P and biologic silica (BSi) plays an important role in cycling of these elements in aquatic ecosystems. In shallow coastal and estuarine systems, water-sediment nutrient dynamics can influence biological processes (e.g., primary production) in overlying waters. READ MORE

  7. 5. Visualization, integration and analysis of multi-element geochemical data

    Author : Katrin Grünfeld; Herbert Henkel; Olle Selinus; Reijo Salminen; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; GIS; interactive visualization; glacial till; biogeochemistry; metals; southeastern Sweden; Geovetenskap; Earth sciences; Geovetenskap;

    Abstract : generated large databases containing information on the concentrations of chemical elements in rocks, surface sediments and biogeochemical materials. Regional geochemical data being imprecise, multivariate, spatially auto-correlated and non-normally distributed pose specific problems to the choice of data analysis methods. READ MORE