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Visar resultat 1 - 5 av 7 uppsatser som matchar ovanstående sökkriterier.

  1. 1. Trends in mountain birch seed abundance and its relation to temperature and moth abundance: a ten-year study from Swedish Lapland

    Kandidat-uppsats, Göteborgs universitet / Instiutionen för biologi och miljövetenskap

    Författare :Frida Gustafsson; [2023-02-09]
    Nyckelord :Betula pubescens; climate change; seed production; Epirrita autumnata; Operophtera brumata; subarctic ecology; folivory; larval abundance;

    Sammanfattning : Boreal forest is the world’s largest terrestrial biome. Being one of the most ubiquitous and coldtolerant tree species in Sweden, the mountain birch forms a unique deciduous treeline and marks the forest-tundra ecotone. LÄS MER

  3. 2. Changes in July albedo and its relationship with EVI over the last two decades in the Swedish alpine region

    Kandidat-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Författare :Vera Grönvik Hende; [2023]
    Nyckelord :Shortwave albedo; Enhanced Vegetation Index EVI ; Alpine vegetation; Scandes; Surface albedo feedback; MODIS; Earth and Environmental Sciences;

    Sammanfattning : Vegetation in the subarctic is expected to respond to climate warming as its growth becomes less temperature limited. This has previously been recorded in the form of treeline advances and increasing shrub cover. Changes in vegetation cover may accelerate warming due to a decrease in summer albedo, in what is termed surface albedo feedback. LÄS MER

  4. 3. CLIMATE CHANGE AND THE NORWAY SPRUCE TREELINE IN THE CENTRAL SCANDINAVIAN MOUNTAINS Treeline evolution, tree growth and a Blue Intensity summer temperature reconstruction

    Master-uppsats, Göteborgs universitet/Institutionen för geovetenskaper

    Författare :Fredrik Karlsson; [2022-09-01]
    Nyckelord :Treeline evolution; Tree growth; Norway spruce; central Scandinavian mountains; Blue Intensity;

    Sammanfattning : In the context of global change, mountain regions have received increased interest in recent times with researchers trying to answer how such regions may be affected by a changing climate. Treeline environments are sensitive to the impacts of climate change which may significantly alter the characteristics of the regions. LÄS MER

  5. 4. Increasing forest mortality and its drivers: Simulating central European forests under climate change

    Kandidat-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Författare :Marieke Scheel; [2021]
    Nyckelord :forest mortality; central Europe; competition; CO2; temperature; precipitation; DVM; LPJ-GUESS; simulation; reproducing data; Earth and Environmental Sciences;

    Sammanfattning : Increasing tree growth and mortality rates in Europe are still poorly understood and have been attributed to a variety of drivers. This study aimed to relate increasing forest mortality rates in six central European countries to climate drivers (CO2 concentration, temperature and precipitation) from 1985-2015, using a process-based vegetation model. LÄS MER

  7. 5. Increase of tree abundance between 1960 and 2009 in the treeline of Luongastunturi in the northern Swedish Scandes : change detection based on aerial photographs

    Kandidat-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Författare :Oskar Löfgren; [2011]
    Nyckelord :geography; physical geography; treeline dynamics; mountain birch; aerial photo interpretation; geografi; naturgeografi; trädgränsen; fjällbjörk; flygbildstolkning; Earth and Environmental Sciences;

    Sammanfattning : Aerial photo interpretation shows a recent densification of trees has been occurring between 1960 and 2009 in the mountain birch (Betula pubescens ssp. czerepanovii) forest of the treeline ecotone in northern Swedish mountains. LÄS MER