Template-Type: ReDIF-Article 1.0 Author-Name: N. Nikolić Author-Workplace-Name: Department of Biology and Ecology, Faculty of Natural Sciences, Novi Sad, Serbia and Montenegro Author-Name: S. Orlović Author-Workplace-Name: Faculty of Agriculture, Institute of Lowland Forestry and Environment, Novi Sad, Serbia and Montenegro Author-Name: B. Krstić Author-Workplace-Name: Faculty of Technology, Novi Sad, Serbia and Montenegro Author-Name: Ž. Kevrešan Author-Workplace-Name: Faculty of Technology, Novi Sad, Serbia and Montenegro Title: Variability of acorn nutrient concentrations in pedunculate oak (Quercus roburL.) genotypes Abstract: The objective of this study was to determine mineral element concentrations (N, P, K, Ca, Mg, Na, Fe, Zn, Mn, and Cu) in various parts of pedunculate oak acorns to estimate variability in the chemical composition of different genotypes. Acorns were collected during the 1998 harvest from seventeen Quercus robur L. genotypes. Trees originated from a vegetative seed plantation Banov Brod, belonging to the Forest Estate Sremska Mitrovica (Srem, Vojvodina, Serbia). The investigation of the nutritional status of acorns revealed significant differences between the studied genotypes. Considering all genotypes, the general sequence of nutrient amounts for the entire embryo was as follows: N > K > Ca > P > Mg > Na > Fe > Zn > Mn > Cu. Concentrations of Ca, Mg, Fe, and Mn were higher for the pericarp and seed coat than for the embryo. Pericarp and seed coat nutrient concentrations showed lower variability than in the embryo, with the exception of potassium concentration. Keywords: chemical composition, embryo, mineral elements, seed, testa Journal: Journal of Forest Science Pages: 51-60 Volume: 52 Issue: 2 Year: 2006 DOI: 10.17221/4487-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4487-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200602-0001.txt Handle: RePEc:caa:jnljfs:v:52:y:2006:i:2:id:4487-JFS Template-Type: ReDIF-Article 1.0 Author-Name: J. Holuša Author-Workplace-Name: Forestry and Game Management Research Institute, Jíloviště-Strnady, Czech Republic Author-Name: P. Heralt Author-Workplace-Name: Administration of Protected Landscape Area Pálava, Administration of Nature Conservation, Mikulov, Czech Republic Author-Name: K. Drápela Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic Title: Occurrence and bionomy of Barbitistes constrictus (Orthoptera: Tettigoniidae) in the eastern part of the Czech Republic Abstract: The bionomy of Barbitistes constrictuswas studied using emergence traps, sticky bands, sweeping and counting of females in two localities and Malaise traps in 27 localities in spruce forests in the eastern part of the Czech Republic in 1998-2004. It is a common species there but with a low population density. It has five instars (based on the length of femur and tibia) and the larval development lasts 10-12 weeks. Nymphs climb up to crowns after hatching. Adulthood extends from July to October. Abundance of eggs in the ground is very low. The most effective and exact monitoring method seems to be the method of sticky bands. It is also easy to catch nymphs on forest edges with low branchiness and southern or south-eastern exposition. To catch adults, the transect method and observation of trees are the most suitable. Traps are generally less effective (emergence trap, Malaise trap). The use of cut trees during thinning and principal felling is possible. Keywords: Barbitistes constrictus, emergence trap, sticky bands, sweeping, Malaise trap, counting of female, life history, spruce forests, Czech Republic Journal: Journal of Forest Science Pages: 61-73 Volume: 52 Issue: 2 Year: 2006 DOI: 10.17221/4488-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4488-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200602-0002.txt Handle: RePEc:caa:jnljfs:v:52:y:2006:i:2:id:4488-JFS Template-Type: ReDIF-Article 1.0 Author-Name: I. Štefančík Author-Workplace-Name: National Forest Centre - Forest Research Institute, Zvolen, Slovak Republic Title: Changes in tree species composition, stand structure, qualitative and quantitative production of mixed spruce, fir and beech stand on Stará Píla research plot Abstract: The paper is a contribution to the research on problems of thinnings in mixed (spruce-fir-beech) stands situated in the 5th forest altitudinal zone (beech with fir) in the central part of Slovakia. The research was carried out on two series of permanent research plots established in 1972. Each of the series consists of three partial plots where one plot was tended by free crown thinning in the framework of whole-area tending. On the second plot a non-whole-area tending was realised while the third ones were left without planned silvicultural treatment as controls. Dynamic changes in tree species composition, stand structure, qualitative and quantitative production including silvicultural analysis of seven thinning interventions were evaluated for a period of 29 years. A special attention was paid to development of future crop trees which are the main bearers of stand quality and quantity. The changes were compared with respect to differences between the plots with whole-area and non-whole-area long-term silvicultural treatment and the control plot (without treatments). Keywords: thinnings, stand structure, crop trees, mixed stands, spruce - fir - beech Journal: Journal of Forest Science Pages: 74-91 Volume: 52 Issue: 2 Year: 2006 DOI: 10.17221/4489-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4489-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200602-0003.txt Handle: RePEc:caa:jnljfs:v:52:y:2006:i:2:id:4489-JFS Template-Type: ReDIF-Article 1.0 Author-Name: M. Zapletal Author-Workplace-Name: Centre for Environment and Land Assessment - Ekotoxa Opava, Opava, Czech Republic Title: Atmospheric deposition of nitrogen and sulphur in relation to critical loads of nitrogen and acidity in the Czech Republic Abstract: Estimates of dry and wet deposition of sulphur and nitrogen were compared with critical loads of sulphur and nitrogen in the Czech Republic on 1 ×1 km grid. Deposition was estimated from monitored and modelled concentrations in the atmosphere and in precipitation where the most important acidifying compounds are sulphur dioxide, nitrogen oxides and ammonia, and their reaction products. Wet deposition was derived from concentration values for SO42-, NO3- and NH4+ in precipitation and from precipitation amounts. Dry deposition was derived from concentrations of gaseous components and aerosol in the air, and from their deposition velocities. A simple mass balance model was used to calculate critical loads of sulphur and nitrogen. The annual average value of total (potential) acid decreased from 4,147 to 2,185 mol H+/ha/year between 1991 and 2000. A reduction in total sulphur and nitrogen (total potential acid) deposition by about 60% would protect 98% of the area of sensitive forests. Keywords: acidity, atmospheric deposition, critical loads, nitrogen oxides, sulphur oxides Journal: Journal of Forest Science Pages: 92-100 Volume: 52 Issue: 2 Year: 2006 DOI: 10.17221/4490-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4490-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200602-0004.txt Handle: RePEc:caa:jnljfs:v:52:y:2006:i:2:id:4490-JFS