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Půdní organická hmota ve smrkových a bukových porostech
 Bureš, Karel
The forest floor is one of the components of the forest ecosystem, which significantly affects the composition of the soil and thus significantly affects the productivity and stability of forest habitat. The quality and quantity of humus and humus substance (HS), viz. humic acids (HA) and fulvic acids (FA), is an important soil characteristic. The diploma thesis evaluates the quality and quantity of soil organic matter (SOM) /stock of forest floor; the content and supply of the total carbon and nitrogen, C/N ratio; the content and supply of the total carbon in humus substance (HS), humic acids (HA) and fulvic acids (FA); Q4/6 ratio and the degree of humification/ in spruce stand at an age of 35 years in second generation and beech stand at an age of 45 years in first generation after spruce stand on the field research station Rájec-Němčice of the Drahanská vrchovina Upland (49°26''31''N and 16°41'30''E) in the Czech Republic on the modal oligotrophic Cambisol of a fir-beech forest vegetation zone at an a altitude of 600--660 m at sites of autochthonous mixed forests. Results obtained showed that the higher accumulation of forest floor was determined under the spruce stand than under beech stand. The HA/FA ratio is higher in the spruce stand as against the beech stand where young fulvic acids. The ratio Q4/6 is more favourable in the F layer under spruce stand, in the layer H is more favourable in beech stand and in the Ah horizon is the ratio Q4/6 similar. Degree of humification SH I and II is similar in both stands, appears to be more favourable in the stand of beech. Results obtained prove the suitability of beech distribution to the present sites of extensive spruce monocultures of Central and Eastern Europe in order to return to original mixed stands.
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