Sökning: "vegetation survey"

Visar resultat 1 - 5 av 26 avhandlingar innehållade orden vegetation survey.

  1. 1. Flygbildstolkning av vegetation : metodstudier för översiktlig kartering

    Författare :Margareta Ihse; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Flygfotografi;

    Sammanfattning : Investigations of the possibilities of producing medium scale survey maps of the vegetation cover by the interpretation of aerial photographs started at the Department of Physical Geograhy, University of Stockholm, in 1973. The aim was to produce vegetation maps more easily and more rapidly than by standard field methods. LÄS MER

  3. 2. Breaking the ice : effects of ice formation and winter floods on vegetation along streams

    Författare :Lovisa Lind; Christer Nilsson; Christine Weber; Michael Scott; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; anchor ice; climate change; in-stream; riparian; river ice; streams; vegetation;

    Sammanfattning : Streams in cold regions are characterized by unique hydrological processes that control flow regime and water levels. One of the most important processes is the formation, growth and melting of different types of ice in and around the stream channel during winter. LÄS MER

  4. 3. Boreal vegetation responses to forestry as reflected in field trial and survey data

    Författare :Johan Bergstedt; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Logging; boreal forest; selective cutting; scarification; ground-layer flora; survey data;

    Sammanfattning : This thesis had two objectives: the first objective was to evaluate the response of forest ground vegetation to selected forestry operations, i.e. cutting of different intensities and scarification; the second objective was to compare the use of survey data in vegetation research with that of more traditional research using field trials - i.e. LÄS MER

  5. 4. Aquatic vegetation in coastal ecosystems : The role of biotic interactions and environmental change for ecosystem functions and resilience in the Baltic Sea

    Författare :Åsa Austin; Johan S. Eklöf; Joakim P. Hansen; Serena Donadi; Matthew E. S. Bracken; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; biodiversity; ecosystem functions; ecosystem multifunctionality; water clarity; fish recruitment; functional traits; feedbacks; biotic interactions; competition; facilitation; foundation species; seagrass; macrophytes; lagoons; brackish water; Baltic Sea; marin ekologi; Marine Ecology;

    Sammanfattning : Coastal ecosystems are among the most productive on Earth but subjected to many human pressures. In shallow coastal areas, aquatic vegetation constitutes foundation species that sustain secondary production and act as a nutrient filter, which may buffer human impacts. LÄS MER

  7. 5. Changes in plant community diversity and management effects in semi-natural meadows in southern Sweden

    Författare :Anna-Carin Linusson; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Plant ecology; Vegetation; Species diversity; Management intensity; Community diversity; Ordination; Växtekologi;

    Sammanfattning : The objectives of this thesis were to: 1) survey the vegetation in semi-natural meadows in south-central Sweden, 2) discern meadow vegetation changes in eight semi-permanent plots between studies performed in the 1960s and in 1990, 3) experimentally investigate the effects of variations in management intensity in one dry and one mesic meadow, 4) experimentally investigate the effects of different management practices or absence of management on species dynamics in meadow vegetation. 1. LÄS MER