Journal of Forest Science, 2002 (vol. 48), issue 3

Relationship between crown characteristics and the radial increment of beech (Fagus sylvatica L.) in the Świętokrzyski National Park (Poland)Original Paper

R. Podlaski

J. For. Sci., 2002, 48(3):93-99 | DOI: 10.17221/11860-JFS  

The objectives of this study are to determine the relationship between crown characteristics and the radial increment of beech (Fagus sylvatica L.) and to specify the characteristics of beech trees with the radial increment above the average in the Świętokrzyski National Park. The following relationships have been found: the radial increment of beech increases as the degree of the freedom of the light part of the crown from neighbouring trees increases, and the increase in the relative crown length causes a significant increase in the radial increment. Most of the best growing beech trees are characterized by the light part of the crown confined...

Assessment of long-term tending in mixed stands of spruce, fir and beech on research plot KorytnicaOriginal Paper

I. Štefančík, L. Štefančík

J. For. Sci., 2002, 48(3):100-114 | DOI: 10.17221/11862-JFS  

The paper deals with problems of thinnings in a mixed stand (spruce-fir-beech) situated in the sixth altitudinal forest zone. Three of the five investigated plots were tended by free crown thinning for a long time, and two were left without any planned silvicultural treatments as control. Dynamic changes in tree species composition, stand structure, qualitative and quantitative production were evaluated for a period of 30 years. The changes were compared with respect to differences between the plot with long-term silvicultural treatments and the control plots (without treatments).

Introgression in black poplar (Populus nigra L. ssp. nigra) and its transmissionOriginal Paper

V. Benetka, K. Vacková, I. Bartáková, M. Pospíšková, M. Rasl

J. For. Sci., 2002, 48(3):115-120 | DOI: 10.17221/11863-JFS  

: Introgression was studied in the offspring of P. nigra and P. × canadensis female trees using 3 enzymatic patterns (6-PGD, LAP and GPI). Our investigations were aimed at the offspring from open pollination and controlled pollination by the pollen mixture from 3 clones of P. nigra and 3 clones of P. × canadensis. The rate of introgression in P. nigra offspring from open pollination was 0.67%. Introgression in 3 offsprings of P. nigra from controlled pollination was 7.14%. In P. × canadensis the heterozygous: homozygous phenotype ratio in 2 offsprings from open...

Liming of forest soils: effectiveness of particle-size fractionsOriginal Paper

L. Musil, V. Pavlíček

J. For. Sci., 2002, 48(3):121-129 | DOI: 10.17221/11864-JFS  

The paper studies the effect of a single use of a textural fraction of dolomitic limestone (5.1 t per ha) on soil reaction (pH/KCl and pH/H2O) and the content of exchangeable Ca and Mg (in the soil layer of 0-30 cm or in F, H and A horizons) during a 6-year experiment under a mature Norway spruce stand and a 4-year experiment on a clear-felled area. The increase in pH culminated in the 3rd or in the 3rd-6th year of the experiment. Maximum effects were achieved applying the fine fraction of a particle size £ 1 mm. The coarse fraction of a particle size > 1 mm showed virtually negligible effects. The increase in Ca and Mg content culminated...

Estimation of beech tree transpiration in relation to their social status in forest standOriginal Paper

K. Střelcová, F. Matejka, J. Minďáš

J. For. Sci., 2002, 48(3):130-140 | DOI: 10.17221/11865-JFS  

The results of sap flow continuous measurements by a tree-trunk heat balance method (THB) on beech model trees are analysed in this paper. Experimental research works were carried out in a mature mixed fir-spruce-beech stand in the research area Poľana - Hukavský grúň (j= 48o39´, l = 19o29´, H = 850 m a.s.l.) in UNESCO Biosphere Reserve on two co-dominant and one sub-dominant beech trees. A mathematical model of daily transpiration dynamics was proposed for a quantitative analysis of the daily course of sap flow intensity. The model works on a one-tree level and enables to consider the influence of the tree social position in the stand on the sap flow...