Změny půdního chemismu ve smrkových lesních ekosystémech ve středních polohách.
Authors: V. Podrázský, J. Remeš
English / Anglicky:
Forest soil acidification represents an important topic concerning environmental considerations in the forestry. It is presented as a vital issue in the mountain areas; on the contrary, minimum interest has been paid to it in the middle and lower altitudes. The presented research results document the deficient data on changes in the soil chemistry in the middle altitudes, in the School Training Forest Kostelec nad Černými lesy (Czech University of Life Sciences), 30 km SE of Prague, the Czech capital. The research plots were established in the years 1965–1967, as a part of the commercial fertilization potential research. The soil samples were taken on the control variants, without fertilizer. They are located in the typical sites (Luzulo-pilosse Abietum, Luzulo-Quercetum luzuletosum pilosae, Myrtillo-Abietum) in the altitude 400–450 m a.s.l., in 100–120 years old spruce monocultures. The first sampling took place in 1967, re-sampling in the years 2002/2003. Only a limited set of pedo-chemical characteristics is available from the first sampling of three soil profiles. Results document a considerable soil acidification in the study period (1967–2002/2003). The pH (KCl) decreased more than by 1 unit, also the contents of the bivalent bases decreased in general. On the contrary, the contents of exchangeable Fe sesquioxides increased. The results indicate soil degradation also in the middle altitudes – the topic of discussion is whether is it the effect of air pollution only or also there is a contribution of the tree species change. But in any case, the nutrient depletion and extreme soil acidification can occur also outside of mountain border areas of the Czech Republic.
Czech / Česky:
Forest soil acidification represents an important topic concerning environmental consid