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Comparison of two methods of soil organic matter fractionantion
Fryčová, Kateřina ; Frouz, Jan (advisor) ; Borůvka, Luboš (referee)
Comparison of two different soil organic matter fractionation methods Soil organic matter (SOM) significantly affects physical, chemical and biological properties of soils and plays also a crucial role in the global carbon cycle. In order to simulate SOM dynamics a number of mathematical models have been developed. These models divide SOM into several theoretical pools according to their stability. Unfortunately, lacking experimental procedure which could measure these pools directly, although for this purpose a wide range of fractionation procedures were developed, that are trying identified empirical fractions with theoretical model pools. An objective of this experiment was to reproduce two fractionation procedures on a set of twenty-seven laboratory-prepared samples: according to Six and according to Zimmermann and to compare their results. Also the relationship between respiration and the amount of carbon in different pools was compared. The most significant differences were found in active pools, where Six's method found twice as much carbon than Zimmermann's one. Finally response of both method results to various environmental parameters (mineral composition, litter type and soil mixing) was compared. According to the results of Zimmermann's method the amount of carbon in different pools was mainly...
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Mechanism of the formation of Antarctic ozone depletion
Fryčová, Kateřina ; Přibil, Rudolf (advisor) ; Havlíček, David (referee)
Antarctic ozone hole is so serious environmental problem that has become a subject of study of many scientists and studies. Thanks to them were studied in detail not only the chemical reactions taking place in the stratosphere, but also very specific climatic conditions prevailing over Antarctica, which is why the emergence of the ozone hole was there. The aim of this paper is to summarize the findings and conclusions achieved in these areas of research. The first third is devoted to general description of ozone, its characteristics, division into the tropospheric and stratospheric, chemical reactions in these parts of atmosphere which leads to the formation and dissolution of ozone. Then pay attention to how these natural processes to affect manmade compounds - CFCs and the characteristics of these substances. The next section analyzes the specifics of climate prevailing over Antarctica, how to intervene in the chemical processes in sratosphere, by extension, what their overall share of the damage ozonosphere and of course there are also mentioned chemical reactions leading the biggest ozone depletion. Lastly, are also mentioned legislative measures which man has taken in order to protect the ozone layer, the contemporary situation and outlook and that the implications of a weakening of the ozone layer for...
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Comparison of two methods of soil organic matter fractionantion
Fryčová, Kateřina ; Frouz, Jan (advisor) ; Borůvka, Luboš (referee)
Comparison of two different soil organic matter fractionation methods Soil organic matter (SOM) significantly affects physical, chemical and biological properties of soils and plays also a crucial role in the global carbon cycle. In order to simulate SOM dynamics a number of mathematical models have been developed. These models divide SOM into several theoretical pools according to their stability. Unfortunately, lacking experimental procedure which could measure these pools directly, although for this purpose a wide range of fractionation procedures were developed, that are trying identified empirical fractions with theoretical model pools. An objective of this experiment was to reproduce two fractionation procedures on a set of twenty-seven laboratory-prepared samples: according to Six and according to Zimmermann and to compare their results. Also the relationship between respiration and the amount of carbon in different pools was compared. The most significant differences were found in active pools, where Six's method found twice as much carbon than Zimmermann's one. Finally response of both method results to various environmental parameters (mineral composition, litter type and soil mixing) was compared. According to the results of Zimmermann's method the amount of carbon in different pools was mainly...
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Mechanism of the formation of Antarctic ozone depletion
Fryčová, Kateřina ; Havlíček, David (referee) ; Přibil, Rudolf (advisor)
Antarctic ozone hole is so serious environmental problem that has become a subject of study of many scientists and studies. Thanks to them were studied in detail not only the chemical reactions taking place in the stratosphere, but also very specific climatic conditions prevailing over Antarctica, which is why the emergence of the ozone hole was there. The aim of this paper is to summarize the findings and conclusions achieved in these areas of research. The first third is devoted to general description of ozone, its characteristics, division into the tropospheric and stratospheric, chemical reactions in these parts of atmosphere which leads to the formation and dissolution of ozone. Then pay attention to how these natural processes to affect manmade compounds - CFCs and the characteristics of these substances. The next section analyzes the specifics of climate prevailing over Antarctica, how to intervene in the chemical processes in sratosphere, by extension, what their overall share of the damage ozonosphere and of course there are also mentioned chemical reactions leading the biggest ozone depletion. Lastly, are also mentioned legislative measures which man has taken in order to protect the ozone layer, the contemporary situation and outlook and that the implications of a weakening of the ozone layer for...
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