Show simple item record

dc.contributor.authorGregory, Fiona Marianneen
dc.date2011-12-28 23:27:34.824
dc.date.accessioned2012-01-13T19:18:28Z
dc.date.available2012-01-13T19:18:28Z
dc.date.issued2012-01-13
dc.identifier.urihttp://hdl.handle.net/1974/6953
dc.descriptionThesis (Master, Geography) -- Queen's University, 2011-12-28 23:27:34.824en
dc.description.abstractCape Bounty, Melville Island is a partially vegetated High Arctic landscape with three main plant communities: polar semi-desert (47% of the study area), mesic tundra (31%) , and wet sedge meadows (7%). The objective of this research was to relate biophysical measurements of soil, vegetation, and CO2 exchange rates in each vegetation type to high resolution satellite data from IKONOS-2, extending plot level measurements to a landscape scale. Field data was collected through six weeks of the 2008 growing season. Two IKONOS images were acquired, one on July 4th and the other on August 2nd. Two products were generated from the satellite data: a land-cover classification and the Normalized Difference Vegetation Index (NDVI). The three vegetation types were found to have distinct soil and vegetation characteristics. Only the wet sedge meadows were a net sink for CO2; soil respiration tended to exceed photosynthesis in the sparsely vegetated mesic tundra and polar semi-desert. Scaling up the plot measurements by vegetation type area suggested that Cape Bounty was a small net carbon source (0.34 ± 0.47 g C m-2 day-1) in the summer of 2008. NDVI was strongly correlated with percent vegetation cover, vegetation volume, soil moisture, and moderately with soil nitrogen, biomass, and leaf area index (LAI). Photosynthesis and respiration of CO2 both positively correlated with NDVI, most strongly when averaged over the season. NDVI increased over time in every vegetation type, but this change was not reflected in any significant measured changes in vegetation or CO2 flux rates. A simple spatial model was developed to estimate Net Ecosystem Exchange (NEE) at every pixel on the satellite images based on NDVI, temperature and incoming solar radiation. It was found that the rate of photosynthesis per unit NDVI was higher early in the growing season. The model estimated a mean flux to the atmosphere of 0.21 g C m-2 day-1 at the time of image acquisition on July 4th, and -0.07 g C m-2 day-1 (a net C sink) on August 2nd. The greatest uncertainty in the relationship between NDVI and CO2 flux was associated with the polar semi-desert class.en
dc.language.isoengen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectIKONOSen
dc.subjectNet Ecosystem Exchangeen
dc.subjectPolar Deserten
dc.subjectTundraen
dc.subjectArcticen
dc.subjectSedge Meadowen
dc.subjectNDVIen
dc.subjectRemote Sensingen
dc.subjectCO2en
dc.titleBiophysical Remote Sensing and Terrestrial CO2 Exchange at Cape Bounty, Melville Islanden
dc.typethesisen
dc.description.degreeM.Sc.en
dc.contributor.supervisorTreitz, Paulen
dc.contributor.supervisorScott, Nealen
dc.contributor.departmentGeographyen
dc.degree.grantorQueen's University at Kingstonen


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record