Sökning: "Betula pubescens ssp. czerepanovii"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Betula pubescens ssp. czerepanovii.

  1. 1. Structural Growth in Mountain Birch, Betula pubescens ssp. czerepanovii

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Christina Borg; Uppsala universitet.; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecology; Ekologi; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi;

    Sammanfattning : In this thesis, I have studied long shoot performance in the monoecious, deciduous tree Betula pubescens ssp. czerepanovii. LÄS MER

  2. 2. The nitrogen economy of mountain birch : As related to environmental conditions and genotype

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Martin Weih; Uppsala universitet.; [1998]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecology; Betula pubescens ssp. czerepanovii; growth; nitrogen; subarctic; temperature; ultraviolet radiation; Ekologi; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi; ekologisk botanik; Ecological Botany;

    Sammanfattning : Responses of mountain birch growth to changed environmental conditions arestrongly affected by birch genotype, and nitrogen economy is a key factor influencingthe winter survival of first-year seedlings. These are some of the findings of a series ofstudies, in which growth, nitrogen economy and winter survival were analysed usingpot-grown seedlings of mountain birch (Betula pubescens ssp. LÄS MER

  3. 3. Treeline dynamics in short and long term perspectives observational and historical evidence from the southern Swedish Scandes

    Detta är en avhandling från Sundsvall : Kopieringen Mid Sweden University

    Författare :Lisa Öberg; Mittuniversitetet.; [2013]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Betula pubescens ssp. czerepanovii; Picea abies; Pinus sylvestris; Larix sibirica; climate; Betula pubescens ssp. czerepanovii; Picea abies; Pinus sylvestris; Larix sibirica;

    Sammanfattning : Treelines in high-mountain regions are constrained by heat deficiency, although the working mechanisms are still not entirely understood. Observational and paleoecological studies on treeline performance may contribute to increased understanding of the treeline phenomenon in general. LÄS MER

  4. 4. Treeline dynamics in short and long term perspectives observational and historical evidence from the southern Swedish Scandes

    Detta är en avhandling från Sundsvall : Department of Natural Sciences

    Författare :Lisa Öberg; Mittuniversitetet.; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Betula pubescens ssp. czerepanovii; Picea abies; Pinus sylvestris; climate change; monitoring; treeline advance; clones; megafossils; immigration; Holocene; cryptic refugia; Swedish Scandes; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Terrestrial ecology; NATURVETENSKAP Biologi Terrestrisk; limnisk och marin ekologi Terrestrisk ekologi;

    Sammanfattning : Against the background of past, recent and future climate change, the present thesis addresses elevational shifts of alpine treelines in the Swedish Scandes. By definition, treeline refers to the elevation (m a.s.l. LÄS MER

  5. 5. Mapping and monitoring of vegetation using airborne laser scanning

    Detta är en avhandling från Sundsvall : Department of Natural Sciences

    Författare :Mattias Nyström; Sveriges lantbruksuniversitet.; [2014]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : In this thesis, the utility of airborne laser scanning (ALS) for monitoring vegetation of relevance for the environmental sector was investigated. The vegetation characteristics studied include measurements of biomass, biomass change and vegetation classification in the forest-tundra ecotone; afforestation of grasslands; and detection of windthrown trees. LÄS MER