Essays about: "terrestrial biosphere"

Showing result 1 - 5 of 8 essays containing the words terrestrial biosphere.

  1. 1. Search for Preserved Methanogenic Organisms in Ophiolitic Rocks through Lipid Biomarker Analysis – Implications for Astrobiological Explorations

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Alexandra Zetterlind; [2020]
    Keywords : ophiolite; deep biosphere; archaea; methanogenesis; chemosynthesis; serpentinite-hosted ecosystems; lipid biomarkers; astrobiology; ofiolit; djupbiosfär; arkeér; metanogener; kemosyntes; serpentinit-drivna ekosystem; lipidbiomarkörer; astrobiologi;

    Abstract : Serpentinization is a metamorphic low-temperature geological process, involving a series of chemical reactions that hydrate ultramafic rocks into serpentines and other minerals such as magnetite and brucite. Moreover, the process produces heavily reducing and highly alkaline fluids together with molecular hydrogen (H2) and methane (CH4), which have the capacity to support chemosynthetic microbial life. READ MORE

  3. 2. Assessing the biodiversity crisis within the Triassic-Jurassic boundary interval using redox sensitive trace metals and stable carbon isotope geochemistry

    University essay from Lunds universitet/Geologiska institutionen

    Author : Halla Margrét Viðarsdóttir; [2020]
    Keywords : Stenlille; Schandelah; redox conditions; C-isotopes; marine sediments; trace elements; enrichment factors; mass extinction; Triassic – Jurassic boundary; Earth and Environmental Sciences;

    Abstract : Around the Triassic-Jurassic-Boundary time interval, a severe mass extinction event occurred, which has been associated to volcanism of the Central Atlantic Magmatic Province (CAMP). Significant amounts of greenhouse gases as carbon dioxide (CO2) or methane (CH4) and other volatiles are suggested to have been released into the atmosphere, leading to global warming with subsequent impact on the biosphere. READ MORE

  4. 3. Biomass storage in Swedish forests: A case of land use

    University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Author : Carl-Fredrik Johannesson; [2020]
    Keywords : Physical Geography; Ecosystem analysis; Forest biomass; Biomass storage; Forest carbon; Carbon storage; Carbon cycling; Land use; Primary forest; Earth and Environmental Sciences;

    Abstract : By storing carbon in the biosphere, forests are mitigating climate change. Primary forests have been found to have the potential to store large amounts of carbon, but no studies on carbon storage in Swedish primary forests have been published. READ MORE

  5. 4. Comparison of soil CO2 efflux between different surface covers on a clear-cut and forest stand in southern Sweden, Hyltemossa

    University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Author : Pamela Huskin Okinedo; [2020]
    Keywords : Soil CO2 efflux; Soil respiration; Soil moisture; Soil temperature; Clear-cut; Forest stand; Net ecosystem exchange; Photosynthetically active radiation; Carbon.; Earth and Environmental Sciences;

    Abstract : Large amounts of carbon in the terrestrial biosphere are stored in forest ecosystems and its soil. Once the forest ecosystem is disturbed the release of this carbon can drive positive feedback to global warming. Humans impact the forest ecosystem through clear-cutting for wood production and other commercial purposes. READ MORE

  6. 5. Sustainable Forestry? : A Sustainability Analysis of the Swedish Forest Sector Applying 'Backcasting from Sustainability Principles' as the Methodology

    University essay from KTH/Miljöstrategisk analys (fms)

    Author : Victoria Ronge; [2017]
    Keywords : Framework for Strategic Sustainability; Sustainability Principles; Backcasting from principles; Backcasting from scenarios; Swedish Forest Sector; Clear-cutting; Continuous Cover Forestry; Environmental Objectives; UN Sustainable Development Goals; National Forest Program; Ramverket för strategisk hållbar utveckling; Hållbarhetsprinciper; Backcasting från principer; Backcasting från scenarier; Svenska skogssektorn; Kalhuggning; Trakthyggesbruk; Kontinuitetsskogsbruk; Hyggesfritt skogsbruk; Svenska miljömålen; FNs Hållbarhetsmål; Nationella skogsprogrammet;

    Abstract : Forests are key providers of terrestrial ecosystem services such as climate regulation, water purification, natural pest control, habitats for biodiversity, as well as different forms of wood based materials and food. Nevertheless forests are dangerously exposed to great pressures from various kinds of societal activities. READ MORE