Journal of Forest Science, 2005 (vol. 51), issue 5

Species diversity, abundance and dominance of macromycetes in beech forest stands

I. Mihál, K. Bučinová

J. For. Sci., 2005, 51(5):187-194 | DOI: 10.17221/4558-JFS  

The aim of this paper is to contribute to the knowledge of dynamics of species diversity, abundance, distribution of fruiting bodies and dominance of macromycetes in mycocoenosis of beech monocultures. The problems were studied in beech monocultures on three permanent research plots with various impacts of air pollutants generated by the aluminium plant in Žiar nad Hronom. Over the research period we determined 121 macromycete species and one species of imperfect fungus. We found relatively balanced values of abundance, fruiting body distribution and species dominance on all the examined plots. The species diversity in groups consisting of the most...

Oak mildew - possibilities of its control

F. Soukup

J. For. Sci., 2005, 51(5):195-202 | DOI: 10.17221/4590-JFS  

New possibilities of oak mildew (Microsphaera alphitoides) control were tested and compared with present methods. The results of three-year experiments in 6 localities (Cikar, Budkov, Planá nad Lužnicí, Vědomice, Voznice, Zadní Bor) clearly showed that the sulphur-based fungicides registered for the control of oak mildew (Sulikol K, Sulka) had a relatively good and stable effectiveness, and that two other newly tested preparations (Systhane 12 EC, Amistar) were even more effective when the percentage of infested plants did not exceed 2% (Systhane 12 EC) or 5% (Amistar) in any experimental locality. Their registration should be extended in...

Effect of the position in a stem on the length of tracheids in spruce (Picea abies [L.] Karst.) with the occurrence of reaction wood

V. Gryc, P. Horáček

J. For. Sci., 2005, 51(5):203-212 | DOI: 10.17221/4591-JFS  

The paper was aimed at the determination of variability of tracheid dimensions in spruce wood in relation to the position in a spruce stem. Significant changes in dimensions were found in early-wood and late-wood tracheids along the stem length and radius. There were statistically significant differences (variability along the radius) between particular annual rings. The height of 22 m showed statistically significant differences as compared with other heights (variability along the height). Differences between the length of early-wood and late-wood tracheids were not corroborated in zones CW, OW and SWL. Only in the SWP zone, statistically significant...

Influence of phytotechnology on growth, production and leaf area index of black walnut (Juglans nigra L.) monocultures in Slovakia

F. Tokár, E. Krekulová

J. For. Sci., 2005, 51(5):213-224 | DOI: 10.17221/4592-JFS  

In the paper we evaluate the influence of crown thinning with positive selection, different intensity (moderate PRP III and heavy PRP IV) and 5-year frequency on development of growth, production, quality and leaf area index of black walnut (Juglans nigra L.) monocultures growing on the series of three permanent research plots (PRP) Sikenica (Levice Forest Enterprise, Levice Forest District) as observed in 1978-2003. The trends of development of mean stem, basal area, standing volume and aboveground dendromass (in dry matter) were mainly influenced by heavy crown thinning. The index of growth was as follows: basal area 169.01%, standing volume...

The influence of stand density on Mn and Fe concentrations in beech leaves

J. Machava, M. Barna

J. For. Sci., 2005, 51(5):225-236 | DOI: 10.17221/4593-JFS  

A shelterwood system is widely used in forest management practice. Favourable ecological conditions for the growth of desired natural seedlings are provided by a successive canopy reduction. The impact of these changed conditions is reflected to the greatest extent in the morphology and structure of beech leaves. Differences in the leaf structure can mainly be seen between sunlit and shaded leaves and are themselves manifested in changes of element contents in leaves according to the respective conditions. The relationships between analysed variables were studied during research (1996-1997) in stands of different initial stand density (0.3, 0.5, 0.7...