Sökning: "soil CO2 flux"

Visar resultat 1 - 5 av 14 uppsatser innehållade orden soil CO2 flux.

1. 1. Influence of permafrost disintegration on wetland carbon fluxes in Abisko, Sweden

   Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Författare :Aida Esmailzadeh Davani; [2021]
   Nyckelord :Physical Geography; Ecosystem Analysis; Permafrost; CH4 flux; CO2 flux; Abisko; Wetlands; Earth and Environmental Sciences;

   Sammanfattning : The northern permafrost regions are experiencing a rapid warming as surface temperatures are rising, causing a disintegration of permafrost and a deepening of the active layer (AL). This releases previously frozen carbon, making it available for decomposition by microbes. LÄS MER

3. 2. Assessment of how environmental variables and vegetation structure influence peatland carbon fluxes

   Master-uppsats, Uppsala universitet/Växtekologi och evolution; Uppsala universitet/Institutionen för biologisk grundutbildning

   Författare :Bernabé Ramírez; [2021]
   Nyckelord :;

   Sammanfattning : Boreal peatlands are important ecosystems from a carbon balance perspective because they are natural carbon sinks as a result of millennia of peat formation. However, due to climate change, these ecosystems are susceptible to changes in hydrology and temperature. LÄS MER

4. 3. Modelling gross primary production in semi-arid regions: effects on carbon uptake of intensive agriculture in southern Kenya

   Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Författare :Malin Ahlbäck; [2020]
   Nyckelord :Physical Geography; Ecosystem Analysis; GPP; Africa; Kenya; Land cover changes; Cropland; Remote sensing; Sentinel-2; Earth and Environmental Sciences;

   Sammanfattning : Background and aim: Gross primary production (GPP) is the largest global carbon (C) flux and an important component for counteracting anthropogenic CO2 emissions, understanding vegetation dynamics, and sustaining universal human standards. Africa plays a prominent role in the global C cycle, though our understanding of GPP dynamics is largely hampered by a paucity of ground-based observations. LÄS MER

5. 4. Energy balance closure, water balance, carbon exchange, and water use efficiency : observed and modeled outcomes for a managed, hemiboreal forest in Southern Sweden

   Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Författare :Linsey Marie Avila; [2019]
   Nyckelord :Energy balance; energy balance closure; energy balance ratio; net radiation; sensible heat; latent heat; turbulent fluxes; ground heat flux; energy storage; available energy; Bowen ratio; evaporative fraction; latent heat of vaporization; water balance; evapotranspiration; precipitation; water storage; water discharge; gross primary production; ecosystem respiration; net ecosystem production; carbon exchange; water use efficiency; Earth and Environmental Sciences;

   Sammanfattning : The claims for the potential of boreal and sub-boreal forests to combat negative effects of climate change have been substantial with over half of Earth’s primary forests found within boreal and temperate regions of the Northern Hemisphere. Given the likely occurrence of more extreme climate events in the future, ascertaining a better understanding of how climate effects, such as profound fluctuations in precipitation, decreases in yearly snow, faster snow melt rates, variability in evapotranspiration due to environmental stress, and related changes in the energy, hydrological, and carbon cycles will change these northern, boreal landscapes is crucial. LÄS MER

7. 5. Koldioxidflöde från mark i sydskånsk lövskog, en jämförelsestudie med avseende på dikeskvalitet

   Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Författare :Alexander Nordström; [2018]
   Nyckelord :Physical Geography and Ecosystem analysis; CO2-flux; deciduous forest; soil respiration; forest drainage; Earth and Environmental Sciences;

   Sammanfattning : Att dika skogar till förmån för bland annat bättre tillväxt kan påverka och förändra faktorer som marktemperatur och markfuktighet vilka är de viktigaste faktorerna för markrespirationen och flödet av koldioxid till atmosfären. Markrespirationen svarar för huvuddelen av koldioxidflödet till atmosfären från ett markbundet ekosystem. LÄS MER