DYNAMIC MODELLING OF BIOGEOCHEMICAL PROCESSES IN FOREST ECOSYSTEMS
Author
Summary, in English
The model was applied to a number of coniferous Swedish sites with a wide geographical distribution to investigate the responses of the forest ecosystems to changes in atmospheric deposition and harvest methods. The model output was validated on different levels, including the biomass, the soil organic matter and the soil chemistry. The results of the simulations show that there is a high risk of nitrogen leaching, particularly in the south and centre of Sweden. The leaching of nitrogen is found to be triggered by harvesting, but the magnitude of the leaching depends on the historical accumulation of N from deposition. The simulations also predict an increase in the number of sites with acidified soils in the future, contrary to what has been predicted by previous models. The reason behind this increase was found to be the high uptake rates of base cations associated with high biomass growth rates, which in turn are the result of the high nitrogen deposition. Finally, the results of the ForSAFE-VEG were used to differentiate between the different causes of change in the ground vegetation diversity. The results indicate that the changes in the composition of the ground vegetation are triggered by clear-cutting, but that the direction of these changes is governed by the histories of the sites and the intensity of atmospheric deposition.
Department/s
Publishing year
2006
Language
English
Publication/Series
Reports in Ecology and Environmental Engineering
Document type
Dissertation
Publisher
Department of Chemical Engineering, Lund University
Topic
- Chemical Engineering
Keywords
- Naturvetenskap
- marklära
- Silviculture
- forestry
- forestry technology
- Skogsvetenskap
- skogsbruk
- skogsteknik
- Natural science
- Lantbrukshydrologi
- Soil Science
- agricultural hydrology
- Växtekologi
- Forest Soil Acidification
- Plant ecology
- Plant biochemistry
- Forest Growth
- Vegetation biodiversity
- Carbon Sequestration
- Nitrogen Leaching
- Miljökemi
- Dynamic Modelling
- Växtbiokemi
- Environmental chemistry
Status
Published
Supervisor
- Harald Sverdrup
ISBN/ISSN/Other
- ISSN: 1104-2877
- ISBN: 91-7422-108-6
Defence date
28 March 2006
Defence time
10:15
Defence place
Geocentrum 2, Sölvegatan 10, Lund Institute of Technology.
Opponent
- John Aber (Professor)