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Use of remote sensing data for monitoring of long-term vegetation dynamics on the landscape scale
Brůna, Josef ; Wild, Jan (advisor) ; Romportl, Dušan (referee) ; Kropáček, Jan (referee)
This thesis deals with the use of remote sensing data for studying and monitoring vegetation changes. Thanks to archival materials, we can now make extensive studies at the landscape and global level without the need for large-scale old field data. From the Middle Ages, we can rely on different types of maps, for vegetation studies, these are mainly forestry maps. Since the 1930's, aerial photographs have been available in Europe, and satellite imagery was available since the 1970's. Availability and quality of satellite imagery had increased rapidly during my study. The most recent data source are unmanned aerial systems and methods of processing their data, which allow inexpensive detailed mapping of large areas. The presented publications do not only solve ecological research questions, but also contribute to solving current environmental problems in the Czech Republic, from nature conservation in National Parks and protected areas to monitoring of plant invasions. I have used archival forest maps for the reconstruction and analysis of large disturbances (windthrow and subsequent gradations of bark beetle) in forests of Šumava and the Bavarian Forest in 1868-1870. Species composition, as well as environmental factors derived from digital elevation model, were analyzed. The same topic was also...
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Use of remote sensing data for monitoring of long-term vegetation dynamics on the landscape scale
Brůna, Josef
This thesis deals with the use of remote sensing data for studying and monitoring vegetation changes. Thanks to archival materials, we can now make extensive studies at the landscape and global level without the need for large-scale old field data. From the Middle Ages, we can rely on different types of maps, for vegetation studies, these are mainly forestry maps. Since the 1930's, aerial photographs have been available in Europe, and satellite imagery was available since the 1970's. Availability and quality of satellite imagery had increased rapidly during my study. The most recent data source are unmanned aerial systems and methods of processing their data, which allow inexpensive detailed mapping of large areas. The presented publications do not only solve ecological research questions, but also contribute to solving current environmental problems in the Czech Republic, from nature conservation in National Parks and protected areas to monitoring of plant invasions. I have used archival forest maps for the reconstruction and analysis of large disturbances (windthrow and subsequent gradations of bark beetle) in forests of Šumava and the Bavarian Forest in 1868-1870. Species composition, as well as environmental factors derived from digital elevation model, were analyzed. The same topic was also...
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Use of remote sensing data for monitoring of long-term vegetation dynamics on the landscape scale
Brůna, Josef
This thesis deals with the use of remote sensing data for studying and monitoring vegetation changes. Thanks to archival materials, we can now make extensive studies at the landscape and global level without the need for large-scale old field data. From the Middle Ages, we can rely on different types of maps, for vegetation studies, these are mainly forestry maps. Since the 1930's, aerial photographs have been available in Europe, and satellite imagery was available since the 1970's. Availability and quality of satellite imagery had increased rapidly during my study. The most recent data source are unmanned aerial systems and methods of processing their data, which allow inexpensive detailed mapping of large areas. The presented publications do not only solve ecological research questions, but also contribute to solving current environmental problems in the Czech Republic, from nature conservation in National Parks and protected areas to monitoring of plant invasions. I have used archival forest maps for the reconstruction and analysis of large disturbances (windthrow and subsequent gradations of bark beetle) in forests of Šumava and the Bavarian Forest in 1868-1870. Species composition, as well as environmental factors derived from digital elevation model, were analyzed. The same topic was also...
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Historický vývoj a vegetační změny nivy dolního úseku řeky Labe
ROTTENBORN, Jan
This work has been divided into two main sections theoretical and research sections. The theoretical section focuses on the bases for the studied issue. It mainly defines a floodplain and wider space of a river and presents development of recognition of processes, which we refer to as vegetation development and dynamics. These range from the theory of plant succession to vegetation succession in view of the significantly distributed environment. And it also shows how a one-sided view of the effect of a river on vegetation with recognition changed only after the biogemorphic approach, when all described parts are mutually related. Today no one will be surprised that vegetation also influences geomorphic processes, such as erosion and sedimentation, and that this view of the issue has been through its own development. The next part of the work presents the monitored territory and characterises natural phenomena, such as geomorphology, geology, hydrology and selected environmental characteristics (potential vegetation, climate, phytocelonology and phytogeography). It also summarises all available botanical data regarding the territory and familiarises the reader with the history and current status of botanical research. The final part of the work presents known changes which have occurred in the floodplain in the recent period (over several centuries). These mainly include changes in the manifestation of the river, indicated by changed oscillation of the water level, adjustments to the river bed and floodplain as such, along with pollution and eutrophisation of the river, a change to generic class (entry of neophytes and plant invasion) and a change to floodplain management. The research section is divided into four parts, which correspond to published or soon-to-be-published articles. The first collects all available data about historical species composition, compares them with the current situation and tries to put them into context with the changes that have occurred and area occurring in the floodplain. The second (and from my point of view crucial) part is based on long-term collection of data at permanent monitoring points. A large number of collected images (more than 700) include a large amount of information about the current composition of vegetation and make it possible to compare year-to-year changes, put them into context with changes in monitored abiotic factors and estimate the frequency of the processes that occur on gravel days. The third part focuses on the Corrigiola litoralis, known by its common name strapwort, which, as has already been stated in the introduction, is a critically endangered species and is also very characteristic for the studied groups. This part attempts if possible to present in the most effective way this species, its biology and changes in its population and to identify potential threats as well as opportunities. The fourth final part attempts to show other options for examination of vegetation changes. It uses the resources of geographical information systems. It presents examples of how the river flow in a relatively short period of time in a "little regulated" part has changed and how vegetation reacts to it. It uses both historical map data and modern aerial shots adjusted to orthophotographs.
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Use of remote sensing data for monitoring of long-term vegetation dynamics on the landscape scale
Brůna, Josef ; Wild, Jan (advisor) ; Romportl, Dušan (referee) ; Kropáček, Jan (referee)
This thesis deals with the use of remote sensing data for studying and monitoring vegetation changes. Thanks to archival materials, we can now make extensive studies at the landscape and global level without the need for large-scale old field data. From the Middle Ages, we can rely on different types of maps, for vegetation studies, these are mainly forestry maps. Since the 1930's, aerial photographs have been available in Europe, and satellite imagery was available since the 1970's. Availability and quality of satellite imagery had increased rapidly during my study. The most recent data source are unmanned aerial systems and methods of processing their data, which allow inexpensive detailed mapping of large areas. The presented publications do not only solve ecological research questions, but also contribute to solving current environmental problems in the Czech Republic, from nature conservation in National Parks and protected areas to monitoring of plant invasions. I have used archival forest maps for the reconstruction and analysis of large disturbances (windthrow and subsequent gradations of bark beetle) in forests of Šumava and the Bavarian Forest in 1868-1870. Species composition, as well as environmental factors derived from digital elevation model, were analyzed. The same topic was also...
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Natural forest disturbances palaeoecology
Moravcová, Alice ; Pokorný, Petr (advisor) ; Novák, Jan (referee)
This Bc. thesis deals with the disturbances, which form an integral part of many ecosystems. The main foci are natural disturbances (in contrast to anthropogenic ones) of temperate and boreal forests. I deal with the causes of major disturbancy factors (fires, storms, disease and insect pathogens) and their impact on the ecosystem. I focused in detail on fires, because they represent an essential factor in the development of many ecosystems. Moreover, they can be studied in the past by using several tools of palaeoecological analysis: dendroecology, anthracology and pollen analysis combined with micro-charcoal particles quantification. The last part of the thesis discusses the role of disturbances in the secular succession of Holocene vegetation in Central Europe. It contains a chapter that describes a research strategy focused to the study of natural disturbances through paleoecological methods in a specific location (Rynholec, Central Bohemia). Key words disturbances, vegetation dynamics, fire dynamics, secular succession, palaeoecological methods
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