Sökning: "Carbon fluxes"

Visar resultat 11 - 15 av 134 avhandlingar innehållade orden Carbon fluxes.

  1. 11. Land-atmosphere interaction of a subarctic palsa mire

    Detta är en avhandling från GeoBiosphere Science Centre, Department of Physical Geography and Ecosystems Analysis, Lund University, Sölvegatan 12, 223 62, Lund, Sweden

    Författare :Marcin Jackowicz-Korczynski; Lunds universitet.; Lund University.; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; eddy covariance; chamber; methnaol; isoprene; nonmethane hydrocarbons; methane; carbon dioxide; carbon; mire; permafrost; subarctic; palsa; greenhouse gas;

    Sammanfattning : The main objective of this thesis was to quantitatively estimate the gaseous exchange of carbon dioxide (CO2) and methane (CH4) between a subarctic wetland ecosystem and the atmosphere. Additionally some initial estimates of the carbon input to the atmosphere of nonmethane hydrocarbons (NMHCs) were also obtained by combining different techniques in a joint setting. LÄS MER

  2. 12. Impact of root and mycorrhizal exudation on soil carbon fluxes : influence of elevated CO2 and metals

    Detta är en avhandling från Örebro : Örebro universitet

    Författare :Emma M. Johansson; Örebro universitet.; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; amino acids; 13C; carbon cycle; ectomycorrhiza; elevated CO2; exudation; DOC; LMWOA; metal stress; monosaccharides; oxalate; Pinus sylvestris; saprotrophic fungi; soil respiration; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES Chemistry Environmental chemistry; NATURVETENSKAP Kemi Miljökemi; Enviromental Science; Miljövetenskap;

    Sammanfattning : The thesis concerns the behavior of root and ectomycorrhizal (ECM) exudates. In particular, the dynamics of soluble low molecular weight (LMW) organic compounds such as organic acids (LMWOAs), amino acids, monosaccharides, and dissolved organic carbon (DOC) have been studied. LÄS MER

  3. 13. Fluxes of Sensible and Latent Heat and Carbon Dioxide in the Marine Atmospheric Boundary Layer

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Erik Sahlée; Uppsala universitet.; [2007]
    Nyckelord :Meteorology; Sensible heat flux; Latent heat flux; Carbon dioxide; Turbulent exchange; Global heat fluxes; Marine boundary layer; Air-sea interaction; Meteorologi;

    Sammanfattning : Oceans cover about 70% of the earth’s surface. They are the largest source of the atmospheric water vapour and act as enormous heat reservoirs. Thus in order to predict the future weather and climate it is of great importance to understand the processes governing the exchange of water vapour and heat between the ocean and atmosphere. LÄS MER

  4. 14. Plant-soil-herbivore interactions in a high Arctic wetland - Feedbacks to the carbon cycle

    Detta är en avhandling från Department of Physical Geography and Ecosystem Science, Lund University

    Författare :Julie Maria Falk; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Arctic wetlands; carbon balance; herbivory; increased grazing pressure; methane fluxes; muskox exclusion; substrate avalibility; vegetation composition and density;

    Sammanfattning : Popular Abstract in Danish Omkring halvdelen af den globale kulstof mængde som findes i jorden, er lagret i de arktiske jorde. Arktiske jorde har været anset for at være vigtige kulstof reservoirs de sidste 10.000 år, hvor der bliver optaget mere kulstof end der frigives. LÄS MER

  5. 15. Gas Exchange over Aquatic Interfaces and its Importance for Greenhouse Gas Emission

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Jovana Kokic; Uppsala universitet.; [2017]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; gas exchange; lake; stream; lake sediment; headwaters; carbon dioxide; methane; greenhouse gas emission; carbon; turbulence; Biology with specialization in Limnology; Biologi med inriktning mot limnologi;

    Sammanfattning : Aquatic ecosystems play a substantial role in global cycling of carbon (C), despite covering only about 4% of the earth surface. They emit large amounts of greenhouse gases (GHG) to the atmosphere, comparable to the amount of C stored annually in terrestrial ecosystems. In addition, C can be buried in lake sediments. LÄS MER