Search for dissertations about: "northern high latitudes"

Showing result 11 - 15 of 37 swedish dissertations containing the words northern high latitudes.

  1. 11. Spatial and temporal dynamics of subarctic birch forest carbon exchange

    University dissertation from Department of Physical Geography and Ecosystem Science, Lund University

    Author : Michal Heliasz; Lunds universitet.; Lund University.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; mountain birch; eddy covariance; carbon budget; insect outbreak; forest expansion; temporal variability; spatial variability;

    Abstract : Popular Abstract in English The long-term stability of the global terrestrial carbon sink has been a matter of concern in that a weakening would have serious consequences for atmospheric CO2 concentrations and, hence, for further changes in climate. High northern latitudes are of special importance for the global carbon budget as they store large amounts of organic matter in the soil and are expected to be the most strongly affected by climate change. READ MORE

  2. 12. Molecular control of activity - dormancy transitions in Populus

    University dissertation from Department of Physical Geography and Ecosystem Science, Lund University

    Author : Madeleine Englund; Sveriges lantbruksuniversitet.; [2010]
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Perennials such as woody plants, growing in the high northern part of the earth have to cope with seasonal changes alternating between mild summer and the harsh winter periods. To survive and adapt their reproductive phase to the most favorable environmental conditions trees cycle between periods of active growth during summer and a state of growth arrest during winter, referred to as the activity- dormancy cycle. READ MORE

  3. 13. Temporal and spatial dynamics in subarctic peat plateaus and thermokarst lakes

    University dissertation from Stockholm : Department of Physical Geography and Quaternary Geology (INK), Stockholm University

    Author : A. Britta K. Sannel; Stockholms universitet.; [2010]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Peatlands; permafrost; subarctic; peat plateau; thermokarst lake; macrofossil analysis; carbon nitrogen ratio; peat accumulation; carbon accumulation; remote sensing; binary encoding; time-series analysis; Physical Geography; naturgeografi;

    Abstract : Permafrost peatlands are widespread at high northern latitudes and are important soil organic carbon reservoirs. A future warming in these areas, as suggested by global climate models, can cause thawing and increased ground subsidence (thermokarst), resulting in changes in surface hydrology and ecosystem functioning. READ MORE

  4. 14. Hempseed cake as a protein feed for ruminants

    University dissertation from Stockholm : Department of Physical Geography and Quaternary Geology (INK), Stockholm University

    Author : Linda Karlsson; Sveriges lantbruksuniversitet.; [2010]
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Increasing the use of locally produced protein feeds in ruminant production systems in northern Europe would be a valuable development. Hemp (Cannabis sativa L.) can be cultivated at high latitudes and cold-pressing the seeds to extract the oil produces a residue, hempseed cake (HC), with a high protein content. READ MORE

  5. 15. Towards a changed view on greenhouse gas exchange in the Arctic: new findings and improved techniques

    University dissertation from Lund University

    Author : Mikhail Mastepanov; Lunds universitet.; Lund University.; [2010]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; methane; carbon dioxide; greenhouse gas; chamber; Arctic; fen; permafrost;

    Abstract : Popular Abstract in Swedish Arktiska ekosystem utgör en viktig del av det globala terrestra utbytet av växthusgaser och energi med atmosfären. I ett klimat som förändras, särskilt uttalat i Arktisk, bör tänkbara framtidsprognoser av växthusgasutbytet från dessa områden övervägas noga när framtida klimat modelleras. READ MORE