Journal of Forest Science, 2004 (vol. 50), issue 12

In vitro propagation of European larch (Larix decidua Mill.)

V. Chalupa

J. For. Sci., 2004, 50(12):553-558 | DOI: 10.17221/4656-JFS  

Methods of in vitro propagation of Larix decidua are described in the paper. The influence of explant source, tree age, genotype, composition of nutrient media and phytohormones on in vitro propagation of Larix decidua has been investigated. Needles, isolated vegetative buds, shoot tips, zygotic embryos and cotyledons were used as initial explants. Axillary and adventitious bud cultures were used for fast in vitro shoot multiplication. Root induction was stimulated on low salt medium supplemented with auxin. After rooting and hardening off, micropropagated trees were planted in experimental plots. The growth...

Adaptation of larch (Larix decidua) of Polish provenances under mountainous conditions of Beskid Sądecki (southern Poland)

M. Kulej

J. For. Sci., 2004, 50(12):559-565 | DOI: 10.17221/4657-JFS  

A long-term study carried out within the 1967 All-Poland Larch Provenance Experiment investigated genetic variation in 20 Polish provenances of larch growing under the site conditions of the Beskid Sądecki Mts. (at a test site in Krynica). The study was based on the measurements of tree height made in individual larch populations during 1969-1999, i.e. when trees were 5, 8, 11, 15, 20, 25, 30 and 35 years old. The results showed a considerable adaptation stability of the provenances tested at the Krynica site. This stability, however, tended to decrease with increasing mean height of trees. An estimation of the effect of the "genotype (provenance)...

Ecological aspects of dispersion of gall mites in the vertical profile of the birch crown

I. Buchta, E. Kula, K. Drápela

J. For. Sci., 2004, 50(12):566-572 | DOI: 10.17221/4658-JFS  

In stands of birch Betula pendula Roth in the eastern Krušné hory Mts. the occurrence of the gall mites Acalitus rudis Canestrini and Phyllocoptes lionotus Nalepa was studied in terms of their dispersion in the tree crown. Statistical analyses of data on the infestation of birch with gall mites in the height transects of the eastern Krušné hory Mts. were conducted (1995-2001) as well as detailed monitoring of their dispersion on selected heavily infested sample trees. In 1995-2001 the infestation of birch stands of the eastern Krušné hory Mts. increased. The population dynamics of A. rudis revealed important deviations,...

Soil surface CO₂ fluxes in a Norway spruce stand

M. Acosta, D. Janouš, Marek M.V.

J. For. Sci., 2004, 50(12):573-578 | DOI: 10.17221/4659-JFS  

The measurements of soil CO₂ efflux in a Norway spruce (Picea abies [L.] Karst.) forest stand are reported for a 6-month period (from May 1^st to October 26^th 1999). Forest floor CO₂ efflux was measured at four positions using a portable infra-red gas analyser (LI-COR), operating as a closed dynamic system and connected to a portable soil chamber. Soil CO₂ efflux was measured 3-4 times per month. Soil temperature at a depth of 5 cm was recorded during the whole period with an interval of ten minutes. An exponential regression was used to describe the relationship between soil temperature...

Notes to distribution and seasonal activity of spruce diprionids (Hymenoptera: Diprionidae) in the eastern part of the Czech Republic

J. Holuša, L. Roller

J. For. Sci., 2004, 50(12):579-585 | DOI: 10.17221/4660-JFS  

A study of diprionids associated with spruce was done at 31 sites of the eastern part of the Czech Republic in 1988-2003. In total 45 specimens belonging to Gilpinia abieticola (6 specimens), G. hercyniae (3) and G. polytoma (36) were collected using Malaise traps, emergency traps, bark-beetle pheromone baited traps or sweeping. The spruce diprionids were recorded in 30% of the studied sites only. G. polytoma was the most abundant and it is probably bivoltine with adult activity from April to August. The results of emergence trap-monitoring in Paskovský les indicate that this species is in latency.