Essays about: "O horizon"

Showing result 1 - 5 of 16 essays containing the words O horizon.

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

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Hilda Alfredsson; [2023]
    Keywords : soil organic carbon; agriculture; tillage interruption; carbon sequestration;

    Abstract : 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. READ MORE

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

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Mattias Åsberg Gencturk; [2023]
    Keywords : Barium; soil; organic horizon;

    Abstract : 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. READ MORE

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

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

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

    Abstract : 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. READ MORE

  5. 4. Soil Carbon Stocks in Old Growth Forest : Drivers of variability in soil organic carbon stocks in old growth boreal forests

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Elis Ingvarsson; [2023]
    Keywords : old growth forest; boreal; soil organic carbon stocks; climate gradient;

    Abstract : Soil organic carbon (SOC) is the largest carbon pool in terrestrial ecosystems, which plays an important role in climate change by regulating atmospheric carbon dioxide. Sweden’s forest management has led to a decrease in old growth forests. This change in land use can affect SOC levels in these forests. READ MORE

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

    University essay from SLU/Dept. of Forest Mycology and Plant Pathology

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

    Abstract : 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. READ MORE