The aim of this study was to evaluate the effectiveness of thinning treatments in pine stands in the Forest District Bogdaniec in 2009-2013. The study covered pine stands in the second and third age class, growing on habitats: fresh coniferous forest, fresh mixed coniferous forest, fresh mixed broadleaved forest and fresh broadleaved forest. The direct costs of harvesting and tree skidding and received income from sale were analysed. The economic effectiveness of thinning treatments was defined per 1 ha stand and 1 m³ of harvested timber. Based on the research it differring levels of economic effectivness of thinning treatments in individual years of the research period were found. Moreover, an increase of economic efficiency thinning treatments in relation to increasing age of stand and increasing fertility of the habitat was observed. In the research period, the highest profitability of tending operations was received by forest dictrict in a 41-50 year-old stands (per ha) and in 51-60 year-old stands (to count per 1 m³ of wood), as well as in stands growing on the habitat of fresh broadleaved forest.

In 2007 and 2008 studies aimed to determine the effect of preparation belonging to carbamate compounds (Pirimor 500 WG), organophosphorus compounds (Diazol 500 EW), and quinazolin compounds (Magus 200 SC), on the oxygen consumption rate by adult beetles Anoplotrupes stercorosus were performed. Experiments were carried out under diverse ambient temperatures (14, 19, 24 i 29°C) using two ways of intoxication – contact intoxication or intoxication by ingestion of the biocide. In control insects the ambient temperature affected the oxygen demand only to a small extent. Usually, insecticide preparations which were used, markedly potentiated the oxygen consumption. In those experimental groups significant increases of oxygen consumption as the effect of ambient temperature elevation were noted. The mode of the intoxication influenced oxygen consumption only very slightly. The highest values of oxygen consumption were noted in animals treated by contact intoxication.

This paper presents results of analysis of the dynamics of growth and development of beech stands in the lower subalpine zone in the Bieszczady National Park from the point of view of size-volume interrelationships of the following three main forestforming processes: thickness increment, the process of trees dying off in stands and growing of young trees to reach the layer of the manure stand. The obtained results confirmed that the examined beech forests exhibit similarity with multigenerational, complex forests of primeval character. An argument in favour of this includes in particular: high stand volume, good forest health condition and a positive relationship between the process of tree survival (volume increment and ingrowth) and the decrement process. The wide peak distance of culminations of two traits is characteristic too: the number of trees in the lowest diameter subclass and the volume in the diameter subclass several intervals higher.

The aim of the study was to examine the major biometric of the badger (Meles meles), depending on the sex and age in a selected hunting territory in the region of Piotrków. In total 29 skulls and 23 carcasses of badgers were measured. For characterising the basic dimensions of the body size were used: body length, height at withers, body circumference, and weight of the whole body. Standard cranial measurements were taken for 6 parameters on each skull: length of the profile of the skull, the maximum width of the skull, braincase width, the width of the mouth of the rear nostrils, the height of the braincase and the height of the mandibular branch. As a result sexual dimorphism was detected. Statistically significant difference for distinguishing sexual dimorphism was confirmed for the following parameters: body length, height at withers, and body circumfeence. The annual cycle of seasonal changes in body weight of badgers showed that weight gain depends on the weather.