Essays about: "Betula pubescens"

Showing result 1 - 5 of 32 essays containing the words Betula pubescens.

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

   University essay from Göteborgs universitet / Instiutionen för biologi och miljövetenskap

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

   Abstract : 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. READ MORE

3. 2. Röjningsstrategiers effekt på stubbskottsutveckling och granmedelhöjd i blandbestånd av gran och björk

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

   Author : Max Lindhe; Jonathan Samuelsson; [2023]
   Keywords : röjningsstrategi; stubbskott; björk; gran;

   Abstract : Olika röjningsstrategier förväntas påverka stubbskottsbildning hos röjstubbar av vårtbjörk (Betula Pendula Roth) och glasbjörk (Betula Pubescens Ehrh), men relativt få studier har gjorts på området, varför det finns utrymme för vidare forskning. Det huvudsakliga syftet med den här uppsatsen var att undersöka skillnaderna i stubbsskottsutveckling till följd av olika röjningsstrategier. READ MORE

4. 3. Growth of Silver birch (Betula pendula) & Downy birch (Betula pubescens) established in four different initial densities on one site in central Sweden

   University essay from SLU/Southern Swedish Forest Research Centre

   Author : Edvards Romans; [2023]
   Keywords : Betula pendula; Betula pubescens; plantation; initial spacing; simulation; management;

   Abstract : Nowadays, there is an increased demand for timber resources and more sustainable forest management, starting from the establishment phase of the forest, e.g., planting. Depending on the management goals, number of seedlings planted and thus initial spacing can be adjusted in order not to waste resources. READ MORE

5. 4. 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

6. 5. 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