This study suggests a method of valuation for wood coming from dead trees which was applied for pricing of such wood found in Polish forests. This study shows that in Polish forest there are approx. 52 million m³ biocenotic wood coming from dead or dying trees with an estimated value of 1.5 billion PLN/10 years.

One of the main effects of outsourcing of forestry operations by State Forests was the establishment of private sector in forestry services. This sector consists mostly of individual business activity entrepreneurs. Second most common legal form is the civil law partnership. Over half of firms acts together as consortia. On average consortium consists of 4 members. Consortia are mostly founded for particular tender procedure, and the number of enterprises cooperating is increasing.

The rising demand for energy and the need to acquire ever more energy quantities from renewable sources call for seeking energy sources in forestry. The analysis presents a simulation of wood quantities needed to meet the obligation to produce electricity from woody biomass. Three sources of energy were specified, which can be delivered to power plants: medium dimensional round firewood, small dimensional firewood and logging residues. The calculated quantity of wood required by the industrial energy sector will reach 15 million cu. meters. Forestry will be able to directly supply about 5.8 mill. cu. meters of wood for energy purposes, including 3.1 mill. cu. m of medium dimensional roundwood, 1.4 mill. cu. m of small dimensional wood and 1.35 mill. cu. m of woody material in the form of logging residues. The largest quantities of woody material will come from western and northern parts of the country. Taking into account the fact that considerable quantities of wood suitable for energy purposes are currently utilized for heating by rural communities, not much will be left for the industrial energy sector.

The effect of weather conditions on height increments of trees was investigated within eight age classes. Weather conditions (temperature and precipitation) were presented using Sielianinow’s hydrothermal index in the quarterly periods and the De Martonne index in the annual periods. Drought index in a given year was found to have a negative effect on height increments of trees in the following year. A significant effect of weather conditions found in a given increment year was observed only in the case of the youngest trees.

The aim of the study was an inventory of round-leaved sundew Drosera rotundifolia in Zaleśniak Forest District (Lutówko Forest Inspectory, Regional Directorate of State Forest in Toruń), determination of the size of the population of sundew and identification of groups of characteristic species growing with sundew. On a map of the Zaleśniak Forest District from the Military Institute of Geography from 1935 six objects were described as a meadow. The meadow was abandoned, resulting in its transformation. Now they are included in the network Natura 2000 as transitional bogs. The inventory of round-leaved sundew was made in the Zaleśniak Forest District in 2010. Five transitional bogs with the sundew were found and placed on a map. Also there was one with previously inventoried sundew, but it was not observed during this research.

In 2007 and 2008 studies aimed to determine the effect of indoxacarb, substance classified as oxadiazines (Steward 30 WG) and beta-cyfluthrine, belonging to synthetic pyrethroids (Bulldock 025 EC), on the oxygen consumption rate by adult Anoplotrupes stercorosus were performed. Experiments were carried out under various ambient temperature conditions (14, 19, 24 i 29°C) using two ways of intoxication – contact intoxication, or by an ingestion of the biocide. In insects of control group an ambient temperature affected the oxygen consumption only to a small extent. Conversely – applying insecticides markedly potentiated the oxygen consumption, whereas it was also increasing together with an increase of the temperature. The way of the intoxication affected the oxygen consumption only to quite a small extent. However, its greatest changes were noted in animals treated by contact intoxication.

The study was conducted on 13 areas in the Wołów Forest District in oak stands with the common oak as the dominant species. The stands in the Wołów Forest District located in the Odra valley, including the oak stands, were flooded in 1997 and 2010. The aim of this study was to analyse the influence of defoliation on radial growth of oaks in the post-flood stands. Recorded results showed an inferior growth in thickness and greater defoliation in the common oak in the post-flood stands. The average defoliation at 40% has a significant influence on radial growth. It seems advisable to include the capacity of radial growth in the assessment of the condition of trees.

Until recently three species from the genus Trypodendron Stephens, 1830 were reported in Poland: T. domesticum (Linnaeus 1758), T. lineatum (Oliver 1795) and T. signatum (Fabricius 1792). Trypodendron laeve Eggers, 1939 was observed in the Świętokrzyskie Mountains, in the Strict Protection Districts of Chełmowa Góra and Święta Katarzyna. Bark beetles were caught in IBL-2 pheromone traps (barrier type) using Trypodor pheromone. They are the first labelled specimens coming from Poland.