Sökning: "Greenhouse gas fluxes"

Visar resultat 1 - 5 av 44 avhandlingar innehållade orden Greenhouse gas fluxes.

1. 1. Effects of forest management on greenhouse gas fluxes in a boreal forest

   Författare :Patrik Vestin; Institutionen för naturgeografi och ekosystemvetenskap; []
   Nyckelord :Forest management; Greenhouse gas fluxes; Clear-cutting; Thinning; Stump harvesting; Selective cutting; Eddy-covariance; Flux-gradient; Greenhouse gas budgets; CO2; CH4; N2O;

   Sammanfattning : Forest ecosystems cover 31% of the terrestrial land area and store large amounts of carbon in biomass and in soils. The 2015 Paris Agreement recognizes the importance of sinks and reservoirs of greenhouse gases (GHGs) in forests and the importance of enhancing them through sustainable forest management policies. LÄS MER

3. 2. Gas Exchange over Aquatic Interfaces and its Importance for Greenhouse Gas Emission

   Författare :Jovana Kokic; Sebastian Sobek; Erik Sahlée; Marcus B. Wallin; Anne Ojala; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; gas exchange; lake; stream; lake sediment; headwaters; carbon dioxide; methane; greenhouse gas emission; carbon; turbulence; Biology with specialization in Limnology; Biologi med inriktning mot limnologi;

   Sammanfattning : Aquatic ecosystems play a substantial role in global cycling of carbon (C), despite covering only about 4% of the earth surface. They emit large amounts of greenhouse gases (GHG) to the atmosphere, comparable to the amount of C stored annually in terrestrial ecosystems. In addition, C can be buried in lake sediments. LÄS MER

4. 3. Carbon trace gas dynamics in subarctic lakes

   Författare :Joachim Jansen; Patrick Crill; Andreas Lorke; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; lakes; methane; carbon dioxide; fluxes; gas transfer; proxy; climate change; geokemi; Geochemistry;

   Sammanfattning : Northern lakes are important sources of greenhouse gases carbon dioxide and methane to the atmosphere. Emissions are expected to increase as the climate continues to warm. Even so, lake carbon budgets are currently poorly constrained. This is in part because of a limited understanding of the processes that govern the flux. LÄS MER

5. 4. Greenhouse Gas Fluxes and Carbon Sequestration in Young Norway Spruce Stands : The Effects of Fertilization

   Författare :Charlotta Håkansson; Johan Bergh; Per-Ola Hedwall; Monika Strömgren; Anna M. Jensen; Tomas Lundmark; Tobias Rütting; Linnéuniversitetet; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; carbon balance; young mixed forests; Picea abies L. Karst. ; Betula spp; chamber measurements; forest floor greenhouse gas fluxes; eddy-flux technology; above ground biomass; carbon dioxide; methane; nitrous oxide; kolbalans; ung blandskog; Picea abies L. Karst. ; Betula spp; kammarmätningar; markflöden av växthusgaser; eddy-fluxteknik; biomassa ovan jord; koldioxid; metan; lustgas; Forestry and Wood Technology; Skog och träteknik;

   Sammanfattning : The enormous challenge of climate change is discussed and debated today because of its major impact on life on Earth. The forests have an important role to play as the plants absorb carbon dioxide (CO2) from the atmosphere through their photosynthesis and the growing tree retain carbon (C). LÄS MER

7. 5. Land use effects on greenhouse gas emissions from boreal inland waters

   Författare :Marcus Klaus; Jan Karlsson; Peter Staehr; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; greenhouse gas; boreal forest; carbon cycling; whole-ecosystem experiment; limnology; metabolism; forest clearcutting; nitrogen enrichment;

   Sammanfattning : Anthropogenic activities perturb the global carbon and nitrogen cycle with large implications for the earth’s climate. Land use activities deliver excess carbon and nitrogen to aquatic ecosystems. In the boreal biome, this is mainly due to forestry and atmospheric deposition. LÄS MER