Sökning: "plant succession"

Visar resultat 16 - 20 av 33 uppsatser innehållade orden plant succession.

  1. 16. Vegetationsförändringar på Kungsmarken efter återupptagen hävd - Inom tre storrutor med olika hävdhistoria som lämnats till fri succession och sedan restaurerats

    Magister-uppsats, Lunds universitet/Examensarbeten i biologi

    Författare :Patrik Lauthers; [2015]
    Nyckelord :Biology and Life Sciences;

    Sammanfattning : Hay meadows are becoming scarce in the Swedish agricultural landscape and restoration efforts are crucial to not lose the rich biodiversity. I studied three closely situated areas, one formerly grazed and the other two mown for at least 800 years, which had been left for free succession for more than fifty years. LÄS MER

  3. 17. Växter på övergivna betesmarker : förekomst, överlevnad och utdöende på 21 lokaler i Västmanland

    Kandidat-uppsats, SLU/Dept. of Ecology

    Författare :Erik Kohlström; [2015]
    Nyckelord :växter; betesmarker; igenväxning; restaurering; utdöende; överlevnad;

    Sammanfattning : Over the past century, changes in land use have led to large scale abandonment of semi-natural grasslands throughout northern Europe. During the ensuing succession species richness declines as grassland specialist plants are out-competed by a few dominant species. LÄS MER

  4. 18. Växtsamhällets sammansättning i äldre genuina rikkärr jämfört med nybildade rikkärr

    Kandidat-uppsats, Högskolan i Skövde/Institutionen för biovetenskap

    Författare :Karolina Ringdahl; [2015]
    Nyckelord :;

    Sammanfattning : In this essay two young alkaline fens in Rustsäters limestone quarry are compared with two old genuine alkaline fens in the browsed wildlife preserve of Österplana hed and vall, in the municipality of Götene in Sweden. The compound and occurrence of plants in the two sites Brottet övre (Upper Quarry) and Brottet nedre (Lower Quarry) are the starting-point of comparison and discussions of how the sites can develop into genuine alkaline fens and what actions of management that would serve that purpose. LÄS MER

  5. 19. Vegetationens roll i erosiva vattendrag : en review och fältstudie av två nyckelområden i Rönne å

    Kandidat-uppsats, SLU/Dept. of Landscape Architecture, Planning and Management (from 130101)

    Författare :Malin Leth; [2014]
    Nyckelord :erosion; river bank; tree; root; plant; infiltration; interception;

    Sammanfattning : The vegetation’s impact on erosion control is widely explored, even though research’ results are scattered where it suggests a both positive and negative relationship between roots and erosion tendency. Research has measured the roots’ impact on erosion by many different methods, hence the aim of this study is to offer a clearance of what factors play an important role in the choice of appropriate species controlling river bank erosion. LÄS MER

  7. 20. Analysis of Selection and Genetic Drift in a Dioecious Plant : Spatial Genetic Structure and Selection in Phenotypic Traits in a Young Island Population of Silene dioica

    Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Bea Angelica Andersson; [2014]
    Nyckelord :selection; genetic drift; quantitative trait; FST; PST; drift; evolution; founder event; gene flow; Silene dioica; dioecious; substructure; subpopulation; phenotypic trait; pollinator preference; Skeppsvik; Sweden; succession;

    Sammanfattning : Selection and genetic drift are often competing forces in shaping genetic structure in populations. Genetic drift will often effectively cancel out the effect of selection when population sizes are small, such as in colonizing island populations. LÄS MER