Sökning: "biogeochemistry"

Visar resultat 1 - 5 av 45 avhandlingar innehållade ordet biogeochemistry.

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

    Detta är en avhandling från Lund

    Författare :Jeppe Ågård Kristensen; Lund University.; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; Lunds universitet.; [2019-08-26]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biogeochemistry; Aboveground-belowground interactions; Herbivory; Insects; Subarctic; Birch; soil microbes;

    Sammanfattning : 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. LÄS MER

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

    Detta är en avhandling från Linköping : Linköpings Universitet

    Författare :Mats Öquist; Linköpings universitet.; Linköpings universitet.; [2001]
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Biogeokemi; Biologi; Autekologi; Klimatologi; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Sammanfattning : 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. LÄS MER

  3. 3. Geophysical Applications of Vegetation Modeling

    Detta är en avhandling från Max Planck Institute for Biogeochemistry Postfach 10 01 64D-07701 Jena Germany

    Författare :Jed O Kaplan; Lund University.; Lunds universitet.; [2001]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Environmental chemistry; Växtbiokemi; Plant biochemistry; CH4; CO2; stable isotopes; carbon cycle; wetland; ice core; methane; Holocene; mammoths; tundra; ice age; LGM; biogeography; biome; biogeochemistry; Vegetation model; Miljökemi; Physical geography; geomorphology; pedology; cartography; climatology; Fysisk geografi; geomorfologi; marklära; kartografi; klimatologi;

    Sammanfattning : This thesis describes the development and selected applications of a global vegetation model, BIOME4. The model is applied to problems in high-latitude vegetation distribution and climate, trace gas production, and isotope biogeochemistry. LÄS MER

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

    Detta är en avhandling från Stockholm : Stockholm University

    Författare :Juris Aigars; Stockholms universitet.; [2001]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biogeochemistry; biogeokemi;

    Sammanfattning : 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. LÄS MER

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

    Detta är en avhandling från Stockholm : KTH

    Författare :Katrin Grünfeld; KTH.; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; GIS; interactive visualization; glacial till; biogeochemistry; metals; southeastern Sweden; Geovetenskap; NATURAL SCIENCES Earth sciences; NATURVETENSKAP Geovetenskap;

    Sammanfattning : 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. LÄS MER