Sökning: "Ecosystem modeling"

Visar resultat 11 - 15 av 47 avhandlingar innehållade orden Ecosystem modeling.

1. 11. Land use GHG emissions and mitigation options, simulated by CoupModel

   Författare :Hongxing He; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; GHG; CO2; N2O; forest; drained peatland; clay soil; willow; soil nitrate leaching; modeling; CoupModel; GLUE; Land use; mitigation option; cost benefit analysis;

   Sammanfattning : Climate change and greenhouse gas (GHG) emissions are one of the major challenges to the humankind of 21st Century. This thesis focuses on understanding, estimating and suggesting mitigation of the GHG emissions (mainly N2O and CO2) from the land use sector, specifically from forest ecosystems on drained peatlands but also from willow production on agricultural clay soil. LÄS MER

3. 12. Entering the dynamic risk space : Assessing planetary boundary interactions through process-based quantifications

   Författare :Arne Tobian; Johan Rockström; Sarah Cornell; Ingo Fetzer; Dieter Gerten; Martin Volk; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Planetary boundaries; climate change; land-use change; Earth system interactions; ecosystem modeling; green water; vetenskap om hållbar utveckling; Sustainability Science;

   Sammanfattning : The planetary boundaries framework is an effort to define a safe operating space for humanity. Its rationale is that sustainable development needs to be achieved in ways that safeguard the stability of the Earth system on which human prosperity relies. LÄS MER

4. 13. Hydrophysical processes governing brownification : A case study of Lake Bolmen, Sweden

   Författare :Clemens Klante; Avdelningen för Teknisk vattenresurslära; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Natural organic matter NOM ; Hydrodynamics; Lake; Hydrology; Drinking water production; Ecosystem;

   Sammanfattning : Access to water of good quality and quantity has become more challenging because of a changing climate, as well as an increase in the use of natural resources, which has lead to altered water chemistry. One of these changes is known as brownification, resulting from a higher organic matter content causing a yellow-brown color of surface waters. LÄS MER

5. 14. Geophysical Applications of Vegetation Modeling

   Författare :Jed O Kaplan; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Environmental chemistry; Växtbiokemi; Plant biochemistry; CH4; CO2; stable isotopes; carbon cycle; wetland; ice core; methane; Holocene; mammoths; tundra; ice age; LGM; biogeography; biome; biogeochemistry; Vegetation model; Miljökemi; Physical geography; geomorphology; pedology; cartography; climatology; Fysisk geografi; geomorfologi; marklära; kartografi; klimatologi;

   Sammanfattning : This thesis describes the development and selected applications of a global vegetation model, BIOME4. The model is applied to problems in high-latitude vegetation distribution and climate, trace gas production, and isotope biogeochemistry. LÄS MER

7. 15. Modeling nutrient cycling and sustainable forest growth in a changing world

   Författare :Patrik Wallman; LUCSUS; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; nutrients; sustainability; ForSAFE; Chemical technology and engineering; forestry technology; forestry; Silviculture; system dynamics; forest growth models; dynamic modeling; Kemiteknik och kemisk teknologi; skogsbruk; skogsteknik; Skogsvetenskap;

   Sammanfattning : It took 70-80 years to realize the width of the impact of industrialization on the forest ecosystems since a forest ecosystem is a "slow system" as seen from a human perspective. An anticipated future climate change and increasing carbon dioxide and ozone levels will change the conditions even more with time and the widely used statistical forest growth models will not be applicable anymore. LÄS MER