The paper gives a survey of biodiversity of Greek fir (Abies cephalonica) stands in Rogów Arboretum on the background of environmental data. Greek fir is native to the southern and central Greece to the areas of the Mediterranean-montane climate. The data concerning differentiation and species composition of natural stands are not complete as well as those on Greek fir plantations in Europe. The study conducted in Rogów Arboretum has shown the presence of 62 taxa of vascular plants and mosses, 58 taxa of macrofungi and 132 of invertebrates.

The paper gives a survey of biodiversity of noble fir (Abies procera) stands in Rogów Arboretum on the background of environmental data. Noble fir is native to the mountains of north-western United States. During the study in the Rogów Arboretum we have found 53 taxa of vascular plants and mosses, 51 taxa of macrofungi and 112 of invertebrates in Abies procera stands. The documented biodiversity of planted Abies procera stands has been commented with respective data from natural habitats.

Cut-to-length technology for broadleaved species is a novelty in forest operations, also causing various difficulties. The purpose of the study was to find effects of an application of the CTL 40HW head 1 for broadleaves mounted on the UTC 150-6LS harvester used in a thinning operation in a birch stand in northern Poland. For this, productivity, the level of damage in the remaining stand and soil disturbances were analysed. The results present a satisfactory outcome: the average productivity was 13.4 m³·h^-1 (h of operational time). Analysis of the remaining stand showed 4-7% trees with damage. Analysis of the soil on the harvester strip roads showed a bulk density increase of 0.16-0.21 g·cm^-3. It was also observed that there was lower mean soil moisture after harvesting, though this change was not statistically confirmed. The biggest soil penetration resistance increase was observed after two machine drives: 50% on 30 cm of depth and after a single drive 45% on 10 cm of depth.

The paper gives a survey of biodiversity of planted grand fir (Abies grandis) stands in Rogów Arboretum on the background of environmental data compared to those of its natural distribution. Some information concerns studies on grand fir plantations in Europe and their influence on chosen components of the ecosystem. During the study, 63 taxa of vascular plants, mosses and liverworts, 46 taxa of fungi and 110 of invertebrates were found.