Essays about: "Betula"

Showing result 16 - 20 of 102 essays containing the word Betula.

  1. 16. Birch for Future: Yay or Nay?

    University essay from SLU/Southern Swedish Forest Research Centre

    Author : Swastika Chakravorty; [2022]
    Keywords : Betula pendula Roth; Biodiversity; Growth; Simulation; Species Mixture;

    Abstract : Birch (Betula pendula Roth in this study) is a widespread broadleaf species in the Swedish forests. Different birds, saproxylic insects, understorey vascular plants and mycorrhizal fungi are dependent on birch and birch deadwood. The mixture of birch and Norway spruce (Picea abies (L. READ MORE

  3. 17. Utvärdering av metod för att morfologiskt särskilja björkarterna Betula pendula och Betula pubescens

    University essay from SLU/Dept. of Forest Ecology and Management

    Author : Pontus Nykvist; [2022]
    Keywords : björk; morfologi; artbestämning; fällningsmetoden; Silver birch; Downy birch;

    Abstract : Birch is the third most common tree species in Sweden and has previously been seen as a weed in the forests. In the last 20 years, birch has had a clearly increasing trend in Swedens growing timber stock, but there are still many knowledge gaps regarding management, regeneration, processing, and its impact on the environment. READ MORE

  4. 18. Demography of Birch Populations across Scandinavia

    University essay from Uppsala universitet/Växtekologi och evolution; Uppsala universitet/Institutionen för biologisk grundutbildning

    Author : Janek Sendrowski; [2022]
    Keywords : birch; betula; pubescens; pendula; betula pubescens; betula pendula; silver birch; downy birch; demography; population structure; distribution of fitness effects; DFE; dadi; UMAP; PCA; ADMIXTURE; polyDFE; ice age; glaciation; tree; boreal forest; climate change; adaption; tetraploid; diploid-tetraploid introgression; Scandinavia; genetic cluster; pipeline; snakemake; bioinformatics; reproducible; population genetics; postglacial population expansion; demographic history; FEEMS; site-frequency spectrum; SFS; last glacial maximum; LGM; workflow; python; population expansion; population growth; EST-SFS; 0-fold degenerate; 4-fold degenerate; maximum likelihood estimation; MLE; variant call format; VCF; single-nucleotide polymorphism; SNP;

    Abstract : Boreal forests are particularly vulnerable to climate change, experiencing a much more drastic increase in temperatures and having a limited amount of more northern refugia. The trees making up these vast and important ecosystems already had to adapt previously to environmental pressures brought about by the repeated glaciations during past ice ages. READ MORE

  5. 19. Effects on natural seed regenerated Silver birch (Betula pendula Roth) and Downey birch (Betula pubescens Ehrh) by mechanical soil scarification and environmental factors : påverkan på naturligt fröföryngrad Glasbjörk (Betula pubescens Ehrh) och Hängbjörk (Betula pendula Roth) av mekanisk markberedning och omgivande faktorer

    University essay from SLU/Dept. of Forest Ecology and Management

    Author : Oskar Karlsson; [2022]
    Keywords : natural birch regeneration; Birch seed regeneration; soil scarification;

    Abstract : The awareness of forest biodiversity as well as the demand for a higher proportion of deciduous tree species in Swedish forests increases. As such, focus is shifting towards the management of naturally seed regenerated Silver birch (Betula pendula Roth) and Downey birch (Betula pubescens Ehrh). READ MORE

  6. 20. The secret life of moose : patterns of foraging and behaviour based on video collars

    University essay from SLU/Dept. of Wildlife, Fish and Environmental Studies

    Author : cecilia Åström; [2022]
    Keywords : moose; alces alces; foraging; video footage; herbivory; browsing;

    Abstract : To understand how moose forage in the wild, we have to study them without disturbing them then. Video cameras placed on moose are a novel method to study wild individuals without being intrusive. I analyzed video footage from four moose collars, filmed up to nine times a day and filmed from 4 to 11 months, for maximum of 4,5 minutes a day. READ MORE