Journal of Forest Science, 2016 (vol. 62), issue 4

Silvicultural potential of northern red oak and its regeneration - ReviewReview

S. Miltner, I. Kupka

J. For. Sci., 2016, 62(4):145-152 | DOI: 10.17221/115/2015-JFS  

Northern red oak (Quercus rubra Linnaeus) is a promising species which could help to mitigate the sanitary problems. Northern red oak is also a commercial species and offers many environmental services. Northern red oak prefers rather dry acidic sites commonly found in Bohemia. The literature confirms that the species is quite fertile but acorn production is highly variable. Northern red oak seedlings develop a long tap root during their first year, which enhances their survival and performance. Different silvicultural systems are proposed and pros and cons are discussed in this review including their influences on forest floor and soil.

Mid-rotation response to fertilizer by Pinus radiata D. Don at three contrasting sitesOriginal Paper

M.V. Ramírez Alzate, R.A. Rubilar, C. Montes, H.L. Allen, T.R. Fox, E. Sanfuentes

J. For. Sci., 2016, 62(4):153-162 | DOI: 10.17221/106/2015-JFS  

Mid-rotation responses to fertilization of Pinus radiata D. Don plantations after the first or second thinning have been observed in research experiments in many regions where the species is grown. The practice is not however common in commercial plantations. This is probably because the effects of soil-site conditions on the magnitude and duration of tree and stand growth responses are not well understood. The effects of nitrogen (150 and 300 kg N.ha-1) and phosphorus (0, 20 and 40 kg P.ha-1) including common base fertilization of boron (8 kg B.ha-1) and potassium (65 kg K.ha-1) were evaluated in three mid-rotation P. radiata plantations after thinning....

Quality of organic and upper mineral horizons of mature mountain beech stands with respect to herb layer speciesOriginal Paper

O. Špulák, J. Souček, D. Dušek

J. For. Sci., 2016, 62(4):163-174 | DOI: 10.17221/116/2015-JFS  

The study analyses the chemical properties of the soil in open-canopy beech stands in relation to the predominant species of ground vegetation. A hypothesis is examined whether the predominant ground vegetation species can represent in chemical terms different site conditions. Four localities were used for testing reed grass, myrtle blueberry, wavy hair grass and vegetation-free patches. Samples were taken from three organic horizons (litter (OL), fragmented (OF) and humus (OH)) and from the humic first mineral horizon. Significant differences between the variants were found only in the OL horizon, in which the vegetation species explained 65% of the...

Assessing economic pressure on the forest fund of Maramureș County - RomaniaOriginal Paper

C.C. Draghici, D. Peptenatu, A.G. Simion, R.D. Pintilii, D.C. Diaconu, C. Teodorescu, R.M. Papuc, A.M. Grigore, C.R. Dobrea

J. For. Sci., 2016, 62(4):175-185 | DOI: 10.17221/72/2015-JFS  

Romania is also included among the European Union countries where deforested areas have radically increased in recent years, with mountain areas being the most affected. The pressure on the forest fund was analysed in the Maramureş County, as one of the most deforested counties of Romania. In view of assessing the forest area evolution, forested and deforested areas have been calculated for the period 2001-2012, using the Global Forest Change 2000-2012 database provided by the Department of Geographical Sciences, Maryland University. The economic pressure quantification was monitored by developing a database on economic activities based upon the loggings...

Effect of permanent waterlogging on the growth of poplar clones MAX 4, MAX 5 (J-104, J-105) (Populus maximowiczii A. Henry × P. nigra Linnaeus) and evaluation of wood moisture content in different stem parts - Short CommunicationShort Communication

V. Štícha, J. Macků, O. Nuhlíček

J. For. Sci., 2016, 62(4):186-190 | DOI: 10.17221/90/2015-JFS  

The study deals with differences in the growth of 2-year mix of poplar clones MAX 4, MAX 5 in the first rotation period at a site with the average moisture regime and at a neighbouring site affected by waterlogging. Average diameter at breast height (DBH) at the site without the observable water influence was 19.6 mm (average height 380 cm). Average DBH at the water-affected site was 8.1 mm (height 220 cm). The difference was statistically significant, which corroborates the hypothesis of the adverse influence of waterlogging on the growth of poplar clones. Furthermore, moisture content was ascertained in wood samples. A comparison was made of samples...