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Dynamics of aboveground biomass of a sedge fen
HAŠEK, Ladislav
This thesis is part of Project of the Grant Agency of the Czech Republic No P504/11/1151, focused on the role of plants in the balance of carbon dioxide and the other greenhouse gases produced in the ecosystem of a sedge fen, which is situated on the study site Wet Meadows near Třeboň. The thesis deals with the growth dynamics of the dominant sedge, Carex acuta. The samples were taken using the method of successive harvests near the automatic meteorological station of Czech Globe, Academy of Sciences of the Czech Republic. During the growing season nine harvests were accomplished on 25.3, 15.4, 6.5, 5.6., 9.7., 5.8., 9.9., 21.10., 25.11.. On each date eight replicates were taken, i.e., a total of 72 samples within the vegetation season. The seasonal dynamic of the above ground biomass was compared between C. acuta and the other plant species on the experimental area. Both live and dead biomass, was harvested and subsequently sorted to single botanic species, dried, weighed and the values were processed using the MS Excel tables. The seasonal maximum of aboveground biomass of all plant species (both live and dead parts) was found on 9.7. (1452,72 g.m-2). Among plant species the highest values of aboveground biomass were attained by Calamagrostis canescens (1257,93 g.m-2) and C. acuta (1163,49 g.m-2). C. acuta displayed the highest density of all shoots on 15.4 (300 m-2),and the highest average weight of one shoot. The maximum length of the longest live shoot of Carex acuta was very consistent among the measurememnts.
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Effect of simulated eutrophication on primary production of a floodplin wetland
HAŠEK, Ladislav
Annotation This thesis is part of the project GA CR No 526/09/1546 (?Importace of newly assimilated carbon to the interaction of plants with soil in grassland and wetland ecosystems in varying environmental conditions?). The main intention of this work is to determine the aboveground production of a wetland stand of Hamerské louky in the Třeboň Basin Protected Landscape and Biosphere Reserve and to evaluate the effects of mineral fertiliser on its production and plant species composition. The aboveground biomass was harvested on four sampling dates. On 30. 5, 27. 6 and 27. 8, biomass samples were sorted into species while on 26. 10. samples were not sorted. On each date, the aboveground biomass was harvested from three plots within each of the three fertilization treatments. Two replicate samples of an area of 0,125 m2. The biomass values were converted to an area of 1 m2. The studied plots were assigned to three treatments with a different application of mineral fertiliser doses: treatment with high intensity of fetilization included 300 kg NPK. ha-2, treatment with low intensity of fertilization included 65 kg NPK. ha-2 and treatment without fertilization 0 kg NPK. ha-2. The highest total average aboveground biomass was detected on the last sampling date for all treatments. The values were 733,6 g.. m-2 for the treament with high intensity of fertilization, 592,9 g. m-2 for the treatment wtih low intensity of fertilization and 629,7 g.m-2 for the treatment without fertiization. Interestingly, high fertiliser dose inhibited the production of mosses.
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