| Název článku: | Srovnání obsahů a zásob prvků v humusové vrstvě porostů buku lesního, smrku ztepilého a ve smíšených porostech těchto dřevin v České republice |
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| Číslo: | 1 |
| Rok: | 2018 |
| Autor: | Vít Šrámek, Věra Fadrhonsová |
Seven triplets of plots were established representing a wide gradient of environmental conditions. Each triplet contained one plot with pure European beech stand; one plot with pure Norway spruce stand and one plot with mixed stand of these species. OL and OFH layer were sampled separately from four pits at each plot. Chemical analyses of pH, total (C, N, S), extractable and exchangeable elements and calculated stock of elements were compared between plots with different tree species composition. The stock of litterfall – OL layer – varied between 0.27 t.ha-1 and 1.60 t.ha-1 at most of sites. The stock of OFH layer ranges from 12.4 t.ha-1 to 186.6 t.ha-1 and is systematically decreasing in order N. spruce > mixed stand > E. beech. The difference, however, is not statistically significant. From the whole spectra of chemical properties we found only few significant differences mainly between beech and spruce stands – pH (H2O) and exchangeable K (both higher in beech stands), although e.g. exchangeable Mg contents were systematically the lowest at spruce plots in individual triplets. On the other hand, differences between humus forms (mor and moder) were highly statistically significant for most of nutrients. When the stock of elements in OFH layer was evaluated, significant differences were found for carbon, nitrogen, sulphur, calcium, phosphorus and lead. They are in general lower in European beech stand comparing to spruce and mixtures, which is partly connected with lower stock of organic matter itself. C/N ratio in OFH horizon varied at our plots in rather narrow range from 17.8 to 25.9. It generally decreased from N. spruce across mixed to E. beech stands. The differences, however, were not significant. More surprisingly, even the differences between mor and moder humus type were not significant, although C/N is expected to be one of the humus types diagnostic criteria. One reason could be probably found in increased nitrogen deposition in the Central Europe, which distinctly influences forest ecosystems, and the other in relatively higher throughfall N deposition under N. spruce stands comparing to E. beech. For more information see Summary at the end of the article.
