The paper presents the results of investigations into the variability of certain features of the wood macrostructure, such as the width of the annual ring, the share of late wood, and the relative density of the wood of grand fir, growing in four stands in southern Poland. The trees under investigation were 30-35 years old. The research material consisted of incremental cores sampled from trial trees with the use of a Pressler borer. The examined wood features were analysed in sections, each one comprising five annual rings. The rings were given numbers, sorted in an ascending order from the trunk circumference. The mean values of the analysed features were as follows: the annual ring width – 4.38 mm, the share of late wood - 35.39%, the relative wood density – 0.354g·cm-3. It was established that the wood of grand firs growing on less fertile soils had significantly narrower annual rings and higher wood density than those on more fertile soils.
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.