Sökning: "seedling establishment"

Visar resultat 21 - 25 av 27 avhandlingar innehållade orden seedling establishment.

  1. 21. Regeneration and early management of birch and Norway spruce mixtures in Southern Sweden

    Författare :Emma Holmström; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Regeneration involving birch and Norway spruce is the most common mixture on clearcuts in southern Sweden. Sometimes the mixture is unintentional, and the naturally regenerated birch is often regarded as a weed-species in planted Norway spruce monocultures. LÄS MER

  3. 22. Seed production and natural regeneration of beech (Fagus sylvatica L.) in southern Sweden

    Författare :Rolf Övergaard; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : When mature beech forests are harvested, the new regeneration is established by natural regeneration, which is by using the seeds from the old stand to create the new generation. Most often the seed from a single mast year is used preceded by site preparation. LÄS MER

  4. 23. Plant ecological studies related to restoration of a degraded ecosystem in central Tanzania

    Författare :Shadrack Eliapenda; Ingvar Backéus; Karin Bengtsson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Conservation; land degradation; population growth rate; population structure; regeneration; Utvecklingsbiologi; Developmental biology; Utvecklingsbiologi; Ecological Botany; Ekologisk botanik;

    Sammanfattning : Kondoa Irangi area is among the most degraded ecosystems in Central Tanzania as a result of heavygrazing, fire, collection of fuelwood and improper cultivation practices. The restoration process of thisdegraded ecosystem through natural regeneration is slowed by the semi-arid climate of the area combinedwith poor soil nutrient status. LÄS MER

  5. 24. Secondary succession in tropical dry forests : drivers and mechanisms of forest regeneration

    Författare :Geraldine Derroire; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Secondary succession is a complex process involving numerous factors acting across scales. Understanding secondary succession in tropical dry forests is important for the conservation and restoration of this highly threatened biome. LÄS MER

  7. 25. Ecology and evolution of local adaptation in Arabidopsis thaliana

    Författare :Giulia Zacchello; Jon Ågren; Xavier Picó; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Arabidopsis thaliana; germination time; natural populations; Near isogenic lines; reciprocal transplants; seed bank; seed dormancy; Biology with specialization in Ecological Botany; Biologi med inriktning mot ekologisk botanik;

    Sammanfattning : In this thesis, I investigate the ecological genetics of local adaptation in the annual herb Arabidopsis thaliana with the aim to identify key traits, agents of selection, and genomic regions contributing to adaptive differentiation. The thesis focuses on adaptive differentiation in timing of germination and seed dormancy between populations located close to the southern and northern range margins in Europe. LÄS MER