Sökning: "Norway spruce bark"

Visar resultat 6 - 10 av 30 avhandlingar innehållade orden Norway spruce bark.

  1. 6. Genetics, breeding and deployment of Melaleuca and Norway spruce

    Författare :Hong Nguyen; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Additive effects of genes are cumulative over generations and are the main source of genetic variation exploited by most plant breeding programs. However, the relative importance of additive and non-additive genetic effects is critical information required to properly evaluate the potential for genetic gain from various breeding programs and deployment options used in the genetic improvement of forest trees. LÄS MER

  3. 7. Prediction of wood species and pulp brightness from roundwood measurements

    Författare :David Nilsson; Ulf Edlund; Michael Sjöström; Olav Kvalheim; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Design of Experiments; ISO brightness; Multivariate Image Analysis; Multivariate Modelling; NIR spectroscopy; Norway spruce; PCA; PLS; Roundwood; Scots pine; Organic chemistry; Organisk kemi;

    Sammanfattning : This thesis presents a number of studies, where a multivariate approach was taken to construct models that predict wood species and thermo mechanical pulp brightness from roundwood of Norway spruce and Scots pine. The first and second studies produced multivariate prediction models for wood species from the bark of spruce and pine. LÄS MER

  4. 8. Characteristics of BVOC emissions from a Swedish boreal forest : Using chambers to capture biogenic volatile organic compounds (BVOCs) from trees and forest floor

    Författare :Min Wang; Institutionen för naturgeografi och ekosystemvetenskap; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; BVOCs; boral forest; Norway spruce; forest floor; branch chamber; soil chamber;

    Sammanfattning : Plant-emitted biogenic volatile organic compounds (BVOCs) are a large group of hydrocarbons released by plant leaves, bark, flowers and fruits into the atmosphere and from plant roots into the soil. BVOCs have important physiological and ecological functions, such as mediating within-plant and plant-plant communication, defense against herbivores attack, protection against heat or other oxidative stress, attracting pollinators etc. LÄS MER

  5. 9. Pine weevil feeding in Scots pine and Norway spruce regenerations

    Författare :Kristina Wallertz; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Damage caused by the pine weevil, Hylobius abietis (L) feeding on conifer seedlings is a major problem in reforested areas in many parts of Europe. The adult weevil feeds on the stem-bark of young seedlings, frequently killing a large proportion of newly planted seedlings. LÄS MER

  7. 10. Stress-induced BVOC emissions from forests in Sweden

    Författare :Erica Jaakkola; BECC: Biodiversity and Ecosystem services in a Changing Climate; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Volatile organic compounds; Plant stress; Forests; Volatile emissions; spruce bark beetle infestations; ozone stress; wildfire recovery; Picea abies Norway spruce ; Betula pubescens ssp. czerepanovii; Pinus sylvestris Scots pine ; sweden;

    Sammanfattning : A changing climate is expected to lead to more extreme weather events, such as an increased frequency of droughts and forest fires. Changing forest conditions can offer benefits to species such as insects, including bark borers that thrive in warm conditions. LÄS MER