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Phytodiversity in old fields of different age and management history on agricultural land adjacent to Czech villages in Romanian Banat area
Veselý, Adam ; Kovář, Pavel (advisor) ; Tichý, Tomáš (referee)
The main aim of this thesis was to identify the main factors influencing development and diversity of vegetation on old fields around village Svatá Helena in Romania. I evaluated the influence of age of an old field, its management (mowing, pasture, burning and fallowing), soil chemical properties, topography and surrounding vegetation. Using phytosociological relevés I collected data about species composition and coverage of species of the old field vegetation. With the assistance of local inhabitants I found out the age of the old fields and the type of applied management. I performed chemical analysis of soil properties, determined amount of available phosphorus, total carbon and nitrogen and pH. I also performed floristic survey of surrounding vegetation. The data showed a unimodal trend in plant diversity during succession. The maximal diversity was recorded on 12 years old old fields. The diversity was also influenced by C/N ratio of soils. Growing C/N ratio had a negative effect on plant diversity. Analysis also showed some interesting connections between soil properties and topographic factors. Organic C and N in soils were rising with age of old field, rate of accumulation is higher on slopes. The results showed that soil chemical properties have the highest influence on species...
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Vegetation of old fields and its dynamics in relation to changes of arable land in Czech Banat (Romania)
Veselý, Adam ; Kovář, Pavel (advisor) ; Vojta, Jaroslav (referee)
- 4 - Abstract Recent abandonment of arable land close to the Czech villages originated in Romanian area called Banat during 19th century implies new variety of habitats representing old fields of different age. We can observe succesional stages of vegetation variable in plant diversity, in some cases significantly high with a number of plant species valuable from the viewpoint of nature protection. Some of these species were known as common in Czechlands as well, but nowadays are strongly endangered or completely extinct. Among others, the number of pieces of cattle in Banat has been reduced. This is the reason why traditional pastures have been grazed less intensively, especially those situated in hardly available localities (e.g. karst valleys and slopes) and often shared with neighborhood villages (including Romanian ones). The abandonment of arable fields thus facilitates the landuse by the way of more productive pastures with better availability from the villages. Next steps of secondary succession and the lost of traditional cycle of the land cultivation sparse shrubs are becoming an important part of the old field vegetation structure, which moreover have a strong influence on the potential restoration of forest ecosystems. The main aim of this thesis is to asses the process on the abandoning of...
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Vegetation succession in old fields at broad landscape scales
JÍROVÁ, Alena
This thesis is focused on succession in old fields in Central Europe. Repeated sampling, analysis of surrounding vegetation and soil measurements were conducted in the Bohemian Karst Landscape protected area. Samples from the Doupovské hory Mountains and the rest of the Czech Republic were added to discover basic principles of old field succession at the larger scale of landscapes.
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