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Vegetation succession on fallows in Podyjí National Park - small-area management of abandoned sites
Entová, Martina ; Fabšičová, Martina (advisor) ; Karlík, Petr (referee)
The main aim of the thesis was to describe the succession of several abandoned fields under ploughing and discuss ploughing as a possible management for establishing and maintaining species-rich communities of fallows. Actual vegetation, its development over time and soil seed bank were studied. Experimental small-area ploughing was established at five abandoned fields in the southeastern part of the Podyjí National Park. Three strips with different types of management were founded: A) strip ploughed each year, B) strip ploughed once at the beginning of the experiment, C) control meadow without intervention. Vegetation development was evaluated through a series of relèves recorded during the years 2009-2012. The species composition of the seed bank was described using the seedling-emergence method and subsequent elutriation of soil samples. Similarity indexes, Longevity index (LI) and concept of RCS strategies were used. The vegetation of each-year plowed sites (A) consisted mostly of annual weeds and ruderal species with R-strategy and high LI. Grassland vegetation (C) consisted mostly of grasses and perennial herbs with C-strategy and lower LI. The vegetation of older fallows (B) was at first most similar to one-year fallow (A), but during the 4 years of succession has moved closer to the meadow...
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Species traits determining species composition on abandoned fields
Jarošíková, Cecílie ; Münzbergová, Zuzana (advisor) ; Klimešová, Jitka (referee)
Though succession is a widely studied process, there are only a few reports dealing with changes in plant functional types in the course of succession. Even fewer studies are dealing with agricultural, wet meadows, which are under continuous impact of mowing. The aim of this work is to fill this gap. The studied area is situated in south part of CHKO Slavkovský Les (region of Karlovy Vary, West Bohemia). In previous works grasslands on arable field after 15, 35 and 55 years after abandoned and continual grasslands in last 100 years were detected from historical agriculture maps. The releves on all types of grassland were made and the species pool was investigated. I this work I investigate the functional types and live-history traits of these species and I also look for Ellenberger values and changes of abiotic environment. The result suggests that the late - successional species are long-lived and have slower live cycle (they mature later). Their seeds are less persistent and have worse dispersal ability. Their seedlings are more viable and the species invest more to aboveground biomass than to underground. Late-successional species also flower earlier and shorter time, what seems to be an adaptation to mowing. I found no relationship between successional age in which the species occur and seed mass,...
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Restoration of plant communities after eradication of invasive Reynoutria species
Mártonová, Marie ; Münzbergová, Zuzana (advisor) ; Berchová, Kateřina (referee)
Reynoutria spp. rank among highly invasive taxa in the Czech Republic. Therefore, a considerable effort is focused on its eradication. This is usually done by application of non- selective herbicide based on glyphosate. However, only little is known about the spontaneous recovery of the native vegetation after the eradication, as well as whether the restoration can be facilitated by additional management. In my master thesis I (i) describe the process of restoration after Reynoutria spp. eradication, (ii) evaluate the influence of factors which could potentially inhibit the succession (such as glyphosate, allelopathy, changes in soil conditions due to Reynoutria spp. invasion), and (iii) evaluate the influence of native-species seed addition on establishment of target plant communities. The process of vegetation recovery was followed on 17 sites in a forest and in ruderal forest-free area from 2007 to 2010. Over the three years of the study, the sites in the forest- free area were covered by diverse vegetation, secondary succession on sites in a forest progressed more slowly. Any soil changes were detected. The process of succession was limited probably because a dead biomass was left on the sites after the eradication. The seed addition was also not crucial for the restoration of plant communitites.
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Vegetation dynamics on fallows
Entová, Martina ; Procházka, Tomáš (referee) ; Fabšičová, Martina (advisor)
The bachelor thesis is concerned with problems of abandoned fields. Fields are very important ecosystem for mankind. Abandonment of agricultural land and formation of fallows happend in last decades. Social and political changes can be the reason of fields abandonment as well as economical changes or changes in ecological conditions. The fallows are good model for secondary succession studies, but they can have many other funcitons in a land. Succession doesn't always proceeded in the same way, it can be affected for example by historical land use, species pool or environmental factors. Permanent plots or space for time substitution can be used for succession research. The rich reserve of seeds in the seed bank is typical for fallows. That can be described by several methods: elutriation, cloth bag, flotation or seedling emergence. Many scientists from the Czech Republic and also from all over the world are interested in fallow research. My MSc. thesis is presented at the end of this bachelor thesis. The comparison of actual vegetation and the soil seed bank of fallows in Podyjí National Park will be the aim of this work. Usage of ploughing as a possible management for creation and preservation of a rich fallow associations will be studied.
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Secondary succession toward woodland - Changes in the herb layer species composition
DOSTÁLOVÁ, Alena
This dissertation focus on spontaneously developed forests (SDFs) on mesic stands. The present tree layer was described and the possible changes in the tree layer was estimated. Influence of site- and context-dependent factors on the species composition and general character of the herb layer was studied in detail. An experiment was established to study seed and safe-site limitation of nine forest herb species.
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