Journal of Forest Science, 2007 (vol. 53), issue 9
Germination of acorns and development of oak seedlings (Quercus robur L.) following flooding
C. Kühne, N. Bartsch
J. For. Sci., 2007, 53(9):391-399 | DOI: 10.17221/2144-JFS 
Seeds and seedlings of Quercus robur, a characteristic tree species of the hardwood floodplain forests along the Rhine River, demonstrated high resistance to complete inundation under controlled conditions. In both experimental trials no significant difference between the different flooding periods (8, 10, and 12 weeks) could be established either for shoot emergence or for the measured morphological growth parameters. Flooding delayed the germination of submerged acorns till the end of inundation. However, seeds of the flooding treatments had significantly higher germination rates than the non-flooded acorns of the control. Likewise, dry weights...
Influence of stand density, thinning and elevated CO2 on stem wood density of spruce
I. Tomášková, R. Pokorný, M. V. Marek
J. For. Sci., 2007, 53(9):400-405 | DOI: 10.17221/2142-JFS
Stem wood density (SWD) of young Norway spruce trees (Picea abies [L.] Karst.) growing at ambient (A variant, 350 µmol(CO2)/mol) and elevated (E variant, A + 350 µmol(CO2)/mol) atmospheric CO2 concentration inside of the glass domes with adjustable windows was estimated after six and eight years of the cultivation. Stand density of two subvariants (s - sparse with ca 5,000 trees/ha and d - dense with ca 10,000 trees/ha) and thinning impact (intensity of 27%) on SWD and its variation along the stem vertical profile were investigated. After six years of CO2 fumigation, stems of sparse subvariant...
Game damage to forest trees
V. Malík, P. Karnet
J. For. Sci., 2007, 53(9):406-412 | DOI: 10.17221/2143-JFS
Humans should behave in such a way that they will not endanger the existence of other living entities. After all, human activities affected the tree species composition and wildlife living conditions. Humans are now responsible for the preservation of delicate equilibrium in nature. Two localities were chosen for the research of game damage caused to standing trees - shooting areas Lužánky and Červený jelen, both situated in the vicinity of Jindřichův Hradec in South Bohemia. Seasonal character of tree-damage origin as well as its relation to the chemical content of spruce (Picea abies [L.] Karst.) and pine (Pinus sylvestris [L.]) bark...
Cambioxylophagous fauna of young spruce stands damaged by snow in the Beskids
E. Kula, R. Kajfosz, W. Ząbecki
J. For. Sci., 2007, 53(9):413-423 | DOI: 10.17221/2141-JFS
In 25 to 40-years-old stands damaged by snow in the Beskids, the fauna of cambioxylophages was analyzed both on standing breaks and lying break-off stems. Breaks are characterized by the gradually drying phloem, watered phloem and secondary fauna (Hylurgops palliatus, Hylocoetes dermestoides, Dryocoetes sp., Monochamu sp.), which does not represent any danger to spruce stands. The phloem on lying breaks withered and died till the end of the growing season. The competing species Pityogenes chalcographus (L.) (46-52% cov-er) and species of the genus Dryocoetes (20% cover) colonized the breaks in particular. The upper and the...
Occurrence, biology and harmfulness of Galerucella lineola (F.) (Coleoptera, Chrysomelidae) - Part 2. Larvae and this year's beetles
J. Urban
J. For. Sci., 2007, 53(9):424-444 | DOI: 10.17221/2145-JFS
The second part of the paper deals with the development and harmfulness of larvae and maturation feeding of this year's beetles of Galerucella lineola (F.) before leaving for winter habitats. Embryogenesis takes on average 12 (in the laboratory 9) days. In the area of Žďár situated at a higher and colder location, larvae of the alder biological form occur on Alnus glutinosa and A. incana from June to August. In the warmer lowland area of Brno, larvae of the willow form occur on Salix triandra, S. viminalis and S. caprea from the 3rd decade of May to the beginning of August. In the laboratory, larvae of...