Historické zmeny hornej hranice lesa, Hrubý Jeseník
The aim of this study has been to analyse the spatial-temporal dynamics of the treeline ecotone formed by Norway spruce (Picea abies) as the dominant conifer in the Hruby Jesenik Mountains since the mid 20th century until the present in order to compare vertically connected sections of the timberlin...
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| Format: | Dissertation |
| Language: | Czech |
| Published: |
2011
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| Online Access: | http://www.nusl.cz/ntk/nusl-312455 |
| Summary: | The aim of this study has been to analyse the spatial-temporal dynamics of the treeline ecotone formed by Norway spruce (Picea abies) as the dominant conifer in the Hruby Jesenik Mountains since the mid 20th century until the present in order to compare vertically connected sections of the timberline ecotone. Three features have been examined within the spatial and temporal context - the age structure, the spatial structure and the age/diameter growth. Dendrochronological methods have been employed to estimate the age structure. Moreover, the remote sensing and the GIS method have been used to detect the changes of the Norway spruce cover using the archive and actual aerial orthophotographs through their vectorisation and classification incorporating both spectral and spatial information as well as the knowledge base classification technique. The comparative analysis of the archive and actual orthophotographs has allowed to evaluate the spatial-temporal changes in the cover. The age and diameter growth relation has been established using the non-linear regression. It is established that the changes in the age and spatial structure are synchronous at all localities with a similar altitude. The younger age trees proportion is increasing with the growing altitude and the changes of the cover are largest in the... |
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