Sökning: "tropical ecosystems"

Visar resultat 26 - 30 av 40 uppsatser innehållade orden tropical ecosystems.

  1. 26. Hur påverkar tillgången på ljus höjdtillväxten hos planterade regnskogsträd i en sekundär regnskog på Borneo?

    Kandidat-uppsats, SLU/Dept. of Forest Ecology and Management

    Författare :Emmy Dieden; [2015]
    Nyckelord :ljus; höjdtillväxt; sekundär regnskog; pionjärarter; klimaxarter; skogsrehabilitering;

    Sammanfattning : Regnskogen på Borneo är en av de artrikaste i världen men till följd av mänsklig aktivitet, såsom avverkning, har dessa ekosystem drabbats hårt. Naturlig återhämtning är svår då dessa störningsdrabbade områden missgynnar arter som tillhör områdets naturliga flora och därför finns det ett behov av aktiv rehabilitering av dessa skogar. LÄS MER

  3. 27. Biodiversity at the ecosystem level : structural variation among food webs in temperate and tropical areas

    Kandidat-uppsats, Linköpings universitet/Biologi; Linköpings universitet/Tekniska högskolan

    Författare :Björn Eriksson; [2014]
    Nyckelord :Biodiversity; Ecology; Euclidean distance; Food webs; Latitude; Network characters;

    Sammanfattning : Biodiversity is a fundamental part of the functioning of ecosystems and their ability to provide ecosystem services. It has been shown that a high biodiversity increases the robustness of an ecosystem according to the insurance hypothesis. LÄS MER

  4. 28. Efficiency of bolsa floresta program in the Brazilian amazon

    Master-uppsats, SLU/Dept. of Economics

    Författare :Nathalia Lucas; [2013]
    Nyckelord :Amazon; biodiversity; environmental services; environmental policy; forest; payment for environmental services;

    Sammanfattning : All over the world the increasing disappearance of natural habitats and ecosystems is concerning policy makers, populations and nongovernmental organizations. Many ecosystems such as forests are multifunctional landscapes and they provide a range of environmental services (benefits that people obtain from the ecosystem) that are vital for humankind and therefore worth preserving. LÄS MER

  5. 29. Water hyacinths (Eichornia crassipes) and their presence in Shire River, Malawi : Problems caused by them and ways of utilise them elsewhere

    L3-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Malin Mellhorn; [2013]
    Nyckelord :water hyacinths; Eichhornia crassipes; green manure; Malawi;

    Sammanfattning : Malawi is one of many countries throughout the world struggling with massive amounts of water hyacinths (Eichornia crassipes) in the country’s fresh water resources.  In nutrient-rich ecosystems where the aquatic weed has no natural enemies it will reproduce very rapidly with the consequence that lakes become overgrown, water flow in rivers is reduced, and other water organisms becomes excluded. LÄS MER

  7. 30. Examination of mycorrhizal associations of Allanblackia stuhlmannii : a tree under current domestication

    Master-uppsats, SLU/Dept. of Forest Mycology and Plant Pathology

    Författare :Helena Ström; [2013]
    Nyckelord :Allanblackia stuhlmannii; Symbionts; Arbuscular mycorrhizal fungi; Tree domestication; East Usambara Mountains;

    Sammanfattning : Allanblackia is a tree genus native to humid forests in West, Central and East Africa. Its fruits contain large seeds from which edible high-quality fat can be extracted. LÄS MER