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The paper presents the productive potential of the State Forests woodland over the years 1991-2005. Changes that occurred in that period were also analysed and explained. The research showed a distinct increase in forest productivity as measured by stand volume, its net increment, and its average increment. There was a favourable change in the species and age structure of timber. Wood harvesting was...
From among 392 Picea abies trees growing at the height of 700-800 m above the sea level in the Beskid Sądecki mountain range of the Carpathians (49o35’ N, 19o31’ E, southern Poland), infested by cambio- and xylophagous insects, 110 (28.1%) were also attacked by Ips amitinus (Eichh.). This bark beetle infested most willingly the weakened standing trees of age classes III-V (i.e. 41-100 years old) as...
Tests showed that PF resin modification with diol esters makes it possible – when maintaining identical pressing parameters – to manufacture particleboards with improved mechanical properties and enhanced water resistance in comparison to the control board resinated with pure PF resin. The application of diol esters as modifiers of phenolic resin makes it also possible to produce – at reduced temperature...
The use of Ripley’s K(t) function for analysis of spatial structure of tree stands has recently become easier due to the growing availability of advanced software. Unfortunately not every data set is suitable for analysis with classical estimator of K(t) function. Large directional differences in density of trees in analysed region cause that estimators suggest aggregated distribution of tress even...
The paper presents the results of the isolation and identification of fungi from Quercus robur L. acorns infested by acorn major pests: Curculio glandium Marsh. and Kenneliola spp., and larvae of these insects. Acorns were collected in 2003, in three locations in Poland from the forest floor and from the nets suspended above the forest floor. The most frequently fungi isolated from acorns colonized...
The crushing of the logging residues was carried out on a forest area, on a mixed fresh coniferous site (BMśw). The weight of the logging residues which were left behind on the clear cut area, after taking away the round wood assortments was 47 t. The object of the analysis was a Meri Crusher MJS-2.0 DT crushing machine powered by a Valtra T-190 tractor. The crusher was 2000 mm wide and the power...
“Uroczysko Wielkie Łunawy” belongs to objects which can be distinguished for their considerable floristic values. Varied and slightly deformed flora of this small object comprises 192 species of vascular plants derived from 60 families, including 41 taxons of arborescent plants. Sites of 13 species under legal protection were identified. Valuable fragments of oak-hornbeam and riparian forest communities...
The investigations were carried out in selected Scots pine (Pinus sylvestris L.) stands in Gidle, Koszęcin, and Złoty Potok forest districts (Regional Directorate of State Forests in Katowice). The majority (89.2%) of analyzed 212 Scots pine tree-tops and branches, left in the forest after cuttings, were infested by cambio- and xylophagous insects (Curculionidae – 19 species, Cerambycidae – 4 species)...
The study is an attempt to determine share of sapwood and heartwood in stems of European larch trees from II and III class of age, grown in conditions of fresh coniferous mixed forest site (BMśw), fresh forest mixed site (LMśw), fresh forest site (Lśw). The highest hare of heartwood was observed in stems of European larch in conditions of fresh forest site Lśw, and the smallest in conditions of fresh...
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