Sökning: "O-horizon"

Visar resultat 1 - 5 av 11 uppsatser innehållade ordet O-horizon.

  1. 1. Soil Organic Carbon in Boreal Agricultural Soil : Tillage interruption and its effect on Soil Organic Carbon

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

    Författare :Hilda Alfredsson; [2023]
    Nyckelord :soil organic carbon; agriculture; tillage interruption; carbon sequestration;

    Sammanfattning : Farmers have been disrupting the carbon cycle ever since humans started converting forests to agricultural lands. But are there farming practices that can be applied to increase the carbon storage in the soil and subsequently counteract increasing carbon dioxide levels in the atmosphere? In this study I investigate if soil organic matter (SOM) and soil organic carbon (SOC) change with longer interruption between tillage events. LÄS MER

  3. 2. Barium in the O horizon of soils near Sundsvall, northern Sweden : From local minerals or from anthropogenic emissions?

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

    Författare :Mattias Åsberg Gencturk; [2023]
    Nyckelord :Barium; soil; organic horizon;

    Sammanfattning : Concentrations of potentially toxic metals in surface soils are important to investigate before building new residential areas. Prior to development of a residential area in Sundsvall, northern Sweden, it was observed that barium (Ba) concentrations in the soil at the site exceeded the guideline value of 200 mg kg-1 outlined by the Swedish Environmental Protection Agency. LÄS MER

  4. 3. Aluminum levels in the O-horizon of soils near Sundsvall, Sweden : Are levels of Al elevated due to smelter emission?

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

    Författare :Mattias Sundin; [2023]
    Nyckelord :Aluminium; Smelter emissions; O-horizon; Al concentration; Scots’ pine needles;

    Sammanfattning : Aluminum (Al) is a potentially toxic element for humans, animals, and plants. Al emitted from smelter plants is one source of Al that may be responsible for increased exposure to humans and the environment. LÄS MER

  5. 4. Effects of organic matter depletion on fungal communities in a reconstructed boreal forest podzol system

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

    Författare :Katharine Alice King; [2020]
    Nyckelord :ectomycorrhizal fungi; fungal community structure; fungal diversity; high throughput sequencing; podzol; soil horizons;

    Sammanfattning : The boreal forest biome serves as a valuable resource, both as a source of wood, pulp and biofuel, and as a sink of atmospheric carbon (C). A large proportion of C is sequestered to the soil of the boreal biome, however belowground processes are still poorly understood. LÄS MER

  7. 5. Geokemin inom osorterade cirklar : Analys av tungmetallers distribution inom jordprofiler tagna från Abiskoområdet, nordvästra Sverige

    Kandidat-uppsats, Institutionen för ekologi, miljö och geovetenskap

    Författare :Camilla Johansson; [2012]
    Nyckelord :Abisko area; atmospheric pollution; lead; mercury; non-sorted circles;

    Sammanfattning : The Arctic region appears as a pristine remote environment, yet there is increasing evidence that it is greatly impacted by pollution such as lead (Pb) and mercury (Hg). In this environment deposition of Hg has increased threefold since the last industrial revolution. LÄS MER