Abstract
The aim of work was to investigate the qualitative and quantitative characteristic features of soil fungi associations occurring in I class pine stands threatened by pathogens of tree roots in Zielonka Experimental Forest District. During the mycological analyses of soil, a total of 694 isolates of fungi representing 33 species were obtained. The most numerously represented species was <em>Penicillium daleae</em> which made 75% of all isolates. The second place in the ranking belonged to <em>Penicillium janczewski</em> amounting to 11%. In order to define the qualitative and quantitative similarity between the studied areas, a proportional inconformity was determined. The greatest similarity occurred between the associations of soil fungi obtained from site 64c and 35b.
Highlights
Fungi occur in all environments; they play an important role, both a positive and negative one, in the life of other organisms and ecosystems
The most numerously represented species was Penicillium daleae which made 75% of all isolates and it was present in all associations from all studied sites
On the studies areas where soil samples were taken for mycological analyses, observation were carried out referring to the monitoring of infections diseases of tree roots (Szewczyk 2005)
Summary
Fungi occur in all environments; they play an important role, both a positive and negative one, in the life of other organisms and ecosystems. Soil environment is very favorable for fungi, they participate in the decomposition of dead organic matter, in conditions of a low pH level which limits the activity of bacteria, and they enter into mycorhizal relations with trees. There is no doubt that there exist many factors affecting the quality of relations dominating in the soil determining thereby the occurrence of the particular species of organisms or whole organism associations. Associations of organisms occurring on a given area together with arbores cent species decide about the quality of ecological factors in the given place reacting to all changes taking place there (Mańka 1974). The objective of the present study was to investigate the qualitative and quantitative characteristic
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