Sökning: "shoot growth"

Visar resultat 16 - 20 av 41 avhandlingar innehållade orden shoot growth.

  1. 16. Experimentell bestämning av klimatanpassning hos tall (Pinus silvestris L. och Pinus contorta Dougl.)

    Författare :Mats Hagner; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This paper summarizes the content of three articles published in Studia Forestalia Suecica 80,81,82, 1970.A study of the annual grouuth rhythm on 2-, 3- and 20-year-old Pinus silvestris and 2-year-old Pinus contorta showed that the following methods can be used for experimental assessment of the climatic adaptation of populations and single trees: shoot- and needle elongation, bark colour onterminal, lignification of annual ring and water content of needles. LÄS MER

  3. 17. Molecular mechanisms regulating early cone development in Norway spruce Picea abies (Karst)

    Författare :Shirin Akhter; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Flower development progress through distinct phases that are controlled by complex genetic networks, which in turn are regulated by both endogenous and exogenous factors. A large number of functional studies have been conducted over the past decades to understand the genetic networks that regulate flower development in angiosperm model species. LÄS MER

  4. 18. Population dynamics of the perennial weed species Sonchus arvensis L

    Författare :Saghi Anbari; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Sonchus arvensis L. is a perennial weed that is widely prevalent in annual crops in northern Europe and can cause substantial yield losses. The abundance of S. arvensis has increased recently, primarily due to expansion of organic farming and increased use of reduced tillage. LÄS MER

  5. 19. Nutrient imbalance in Norway spruce

    Författare :Gunnar Thelin; Avdelningen för kemiteknik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Silviculture; Växtekologi; Plant ecology; nitrogen saturation; base saturation; pH; multiple limitation; deficiency; copper; boron; potassium; pollution; sustainability; conifers; forestry; forestry technology; Skogsvetenskap; skogsbruk; skogsteknik; Soil Science; agricultural hydrology; Lantbrukshydrologi; marklära;

    Sammanfattning : The studies presented in my thesis indicate that growing Norway spruce in monoculture does not constitute sustainable forest management in a high N and S deposition environment, such as in southern Sweden. The combination of N-induced high growth rates and leaching due to soil acidification causes soil reserves of nutrients to decrease. LÄS MER

  7. 20. Urban tree establishment : the impact of nursery production systems and assessment methods

    Författare :Anna Levinsson; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The aim of this PhD project was to study tree establishment, both how it may be improved in urban areas and how it is measured and defined. The establishment phase of trees is a period of reduced tree vitality, and a successful establishment is crucial for long-term survival and prosperity of newly planted trees. LÄS MER