| Název článku: | Stav lesních půd, úroveň minerální výživy a vývoj zdravotního stavu smrkových mlazin v Orlických horách v období 2002–2018 |
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| Číslo: | 3 |
| Rok: | 2020 |
| Autor: | Radek Novotný, Věra Fadrhonsová, Vít Šrámek |
Ten research plots were selected on the Eagle Mts. (Orlické hory, Czech Republic) ridge, within complexes of young Norway spruce stands. Since 2002 the defoliation of tree crowns and height increment have been assessed every year after the vegetation season. Sampling of needles for nutrient analyses has been carried out since 2004 every autumn together with the crown condition assessment. Soil samples were taken in 2006, 2010, 2014 and 2018. Samples of the upper organic layer and of the mineral soil in 0–25 cm depth were taken separately. Samples of assimilation organs, humus and mineral soil were prepared and analysed according to the standard ICP Forests methods. Long term results have confirmed that the crown defoliation is decreasing. Health status significantly improved, and crown defoliation values got comparable to those of other forest regions in the Czech Republic. Foliar concentrations of stress elements (sulfur, fluorine) decreased, and foliar analysis demonstrated a significant decrease in air pollution load. There is a problem with insufficient uptake of phosphorus. Soil analyses confirmed the fact that the soil environment is acidic, and the amounts of accessible phosphorus, exchangeable magnesium and calcium are significantly deficient in the mineral soil. In this region there is still high deposition load – total N deposition varies usually between 30–40 kg.ha-1.y-1 and total S deposition between 15–30 kg.ha-1.y-1, i.e. 2–3 times higher than in other regions of the country.
