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Effect of fertilization on primary production of a herbaceous wetland stand
SLÁMA, Miroslav
The bachelor thesis is part of the project GA CR 526/09/1545, which explores the relationship between the carbon cycle, soil and wetland plants in varying conditions of external environment. Within this project total abovengroud biomass produktion was evaluated at the site Hamerské louky in the floodplain of the river Nežárka. Effect of fertilization on these sites is investigated since the beginning of the growing season 2006. On average, the highest biomass yield (all live and dead biomass except litterfall) from the first sampling (10.6.2009) was reached on the site with high-intensity fertilization (494,89 g.m-2). The highest living biomass yield was also reached on the site with high-intensity fertilization (on average 443,88 gm-2). The highest biomass of the stubble from the first sampling was recorded on sites without fertilization (107,14 g.m-2) as well as litterfall (56,05 g.m-2). The difference between treatments were not statistically singnificant. Annual production of aboveground biomass was 823.99 gm-2 in variants with high-intensity fertilization, 642.64 gm-2 in slightly variant fertilization and 698.14 gm-2 in variants without fertilization
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Effect of mineral nutrient availability and flooding on the growth of Carex acuta in a mesocosm experiment
SYCHROVÁ, Jana
This MSc thesis is part of the project GACR 526/09/1545 Importance of newly assimilated carbon for the plant-soil interactions in wet grassland ecosystems in varying environmental conditions, which focuses on the effects of eutrophication on selected wet meadows with mineral or organic soil in the Trebon Biosphere Reserve. The results of this project will serve as a basis for developing a suitable ecosystem management for wet meadows, especially for sites registered as nature reserves. Pot experiments were carried out with Carex acuta, a dominant species of wet meadows that has already been subject of many studies. The aim of this work was to find out how C. acuta responds to different levels of fertilization and soil flooding under controlled conditions. The growth of the generative shoots of C. acuta was significantly affected by fertilization. The growth of vegetative shoots was significantly influenced by the soil organic matter content and fertilizer addition. The vegetative shoots reached greater length than the generative shoots. The pot experiment indicates that fertilization has not a large influence on the growth of C. acuta. This finding may explain field observations that C. acuta is gradually replaced in eutrophic habitats by stronger competitors, especially Phalaris arundinacea.
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Nitrate direction and its influence on agricultural farming
AUBRECHTOVÁ, Vendula
The diploma paper deals with the impact of the Nitrate Direction upon agricultural management in the regions of interest {--} Suchdol nad Lužnicí, Bor u Suchdola nad Lužnicí,and Hrdlořezy u Suchdola nad Lužnicí. Two variants are proposed here of a plant production structure for the application of available amount (14 200 t) of the barnyard manure {--} pig slurry {--} on the agricultural land`s area of 1007,62 ha of which 807,98 ha is the arable land and 199,64 ha is the permanent grass plots. The agricultural land{\crq}s area in the nitrogen vulnerable zone amounts to 354,72 ha of which 327,33 ha is the arable land and 27,39 ha is the permanent grass plots. One of the main limiting criteria of the Nitrate Direction is that the total amount of nitrogen as applied yearly to agricultural land in organic fertilizers, organic mineral fertilizers, and barnyard manures must not exceed a dose of 170 kg N/ha within the entire enterprise on the condition that at least one plot is classified into the nitrogen vulnerable zone. It results from both the proposed variants in this diploma paper that the specified limit of 170 kg N/ha was not exceeded. The management structure selected in both the 1st and the 2nd proposed variant is based on the principles of regular agricultural practices and the adherence to proper environmental conditions in the region of interest.
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