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Landscape as dynamic living system
Pokorný, Jan
Holistic approach to landscape understanding in terms of solar energy dissipation, water and matter fluxes is dealt with. Measures of landscape functioning are defined. Floods and drought as consequences of anthropogenic impact are explained and strategy of sustainable landscape management formulated.
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Role of short water cycle in restoration of ecological functions of landscape
Pokorný, Jan
Fluxes of matter, water and energy are the principle ecological functions of landscape. Open cast mining deteriorated and changed these fluxes since it directly dealt with large surfaces of landscape. The restoration strategy of large landscape surfaces should be aimed at restoration of short water cycle, i.e. restoration of large stands of vegetation in order to close again water cycle and to buffer heat potential in landscape, to close matter cycles and reduce matter losses from landscape.
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Třeboňsko 2000. Ecology and Economy of the Třeboň Region after 20 years
Pokorný, Jan ; Šulcová, J. ; Hátle, M. ; Hlásek, J.
The conference Třeboňsko 2000, with its sub-title The ecology and economy of the Třeboň Region is the third of such conferences - following two ones, held in 1978 and 1988, respectively. The present conference has continued in the fine tradition of good communication between all the subject areas thet are inevitably involved in, and/or influenced by, the conservation and development of the Třeboň Basin Protected Landscape Area and Biosphere Reserve
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Fishpond management and ecological stability of fishponds -as a key water habitats of the Třeboň region
Pechar, Libor
Fishponds have an important role in the hydrological system of the Třeboň region and generally they represent the most common type of stagnant water habitat in the Czech Republic. Most of the fishponds are several hundred years old, and have therefore lost most of their man-made character. The period of intensification of fish production started in the 1930s, when liming and fertilization of the fishponds became a common practice. Since the 1930s, fish production has increased from a mean of about 50 kg ha-1 to more than 500 kg ha-1. Common carp, Cyprinus carpio L. has been the main cultivated fish species. Management for higher fish stock densities, accompanied by higher nutrient loads result in increasing trophic levels, ultimately reaching a state of 'hypertrophy'. The main symptoms of this state are the massive development of phytoplankton and cyanobacterial ' algal blooms', great fluctuations in oxygen concentrations, pH, which, in turn, destabilise the fish pond ecosystem.
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