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Factors Restricting Recruitment Of Ascophyllum Nodosum L (Le Jolis), Paula K B Philbrick
Factors Restricting Recruitment Of Ascophyllum Nodosum L (Le Jolis), Paula K B Philbrick
Doctoral Dissertations
Ascophyllum nodosum dominates a wide zone on the shore. Juveniles occur high in the zone where canopy is continuous and grazing animals few. Settlement could account for the restricted range if it were enhanced under canopy or on the upper shore. Settlement was monitored under canopy and in the open at four shore levels during spring 1983. Propagules settled everywhere. Settlement does not restrict plant establishment. Germlings caged and not caged were placed under canopy and in the open through the zone to evaluate the effects of animals and the physical environment (shore level x frond cover) on survival and …
Fire Dynamics In Amazonia, Manoel Cardoso
Fire Dynamics In Amazonia, Manoel Cardoso
Doctoral Dissertations
Fires are major disturbances for ecosystems in Amazonia. Because of their short time scale and strong links to biogeochemical cycles, fires significantly affect fluxes and stocks of carbon and nutrients, change air composition, and modify ecosystems structure and functioning. Fires are strongly related to land-use, land-cover and climate conditions. Because the increasing development of the region, these factors have been changing and leading to different patterns of fire activity. Thus it is very important to understand the dynamics of fires in the region and to develop models that can project their potential changes. To contribute in all these subjects, we …
Assessing Hemlock Woolly Adelgid Induced Decline And Susceptibility Using Hyperspectral Technologies, Jennifer Pontius
Assessing Hemlock Woolly Adelgid Induced Decline And Susceptibility Using Hyperspectral Technologies, Jennifer Pontius
Doctoral Dissertations
The ultimate goal of this study was to provide the scientific framework for using narrow band hyperspectral instruments to assess early hemlock decline and susceptibility to the introduced hemlock woolly adelgid (HWA). To this end, spectral data from an ASD FieldSpec Pro was used to develop a 6-term linear regression equation, which predicted a detailed decline rating (0--10) with an R2 of 0.71 and RMSE of 0.591. To scale up this method to a remote sensing platform, NASA's Airborne Visible Infrared Imaging Spectrometer (AVIRIS) was used to create a hemlock abundance map, correctly identifying hemlock dominated pixels (>40% basal …