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Entry to reconstruction of potential natural vegetation of forest fragments in Českomoravská vrchovina highlands
Halas, Petr
The biodiversity and the forest vegetation structure are important instruments for the reconstruction of the potential nature landscape situation. One of the basis to explain actual biodivesity may be an attempt to the reconstruction of the potential nature vegetation of the forest fragments. Landscape history, methods of the forest and agricultural management are very important. The actual biodiversity of the forest fragments need not respond to abiotic conditions only but also to the changes of whole landscape.
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Influence of isolated forest fragments area and environmental conditions to vascular plant speciees diversity
Halas, Petr
In this brief paper I deal with to lists of vascular plant species evaluation relate to environmental condition and morphometrical parameters of individual isolated forest fragments. Studied isolated forest fragments are located on eastern part of the Českomoravská vrchovina highlands, tree layer forms broadleaved and mixed forests near nature vegetation. At the beginning of the research I have had presumtion: isolated forest fragments area, their isolation and landscape character (landuse especially) too influence to species composition, number of vascular plant species. This reciprocal relationship was solved using regression tree models.
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Potential of the restoration of the halophyte vegetation lower course of the Trkmanka river floodplain
Halas, Petr
One of the most important areas with halophyte vegetation in the Czech Republic represents lower course of the Trkmanka river floodplain. This vegetation is a small rest of the origin distribution. Plant species structure has changed in context of historical and recent management. Many plant species became extinct due to destruction of biotops, hydrological regime changes and leaving of extensive management too. The chance to survive of the halophyte plant species will exist due to specific feature of halomorphic soil and competitive advantage of halophyte plant species if management of the rare biotops is right.
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Ecotons as a dynamic part of floodplain landscape
Halas, Petr ; Lacina, Jan
Varied mosaic of diverse biocoenoses and ecotons rises by natural fluvial processes in alluvium. Dynamic development of vegetation cover was studied in years 1997 – 2007 in flood river bed of Bečva river. Variable mosaic of biocoenoses and ecotons of Bečva river floodplain is considerably varier than regulated and flood undisturbed riverine landscape of Trkmanka river.
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Entry to metodology of research of diversity and function of ecotone associations on model forest edges
Halas, Petr
The aim of this article is to summarize some of the new information about function and biodiversity of ecotonal societes, especially societes of forest edges. Use of a few methods for analysing gradients of ecological factors and plant diversity changes is showed on examples of two transects from non-forest to forest vegetation in Stredomoravske Karpaty Hills. The method mentioned above seems to be a good device to understand the function of plant societes on ecological boundaries.
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