Phytosociological data from 25 transects of rural forest parks located in the West Masurian District were used to determine changes in the structure and species composition of various layer of the tree stand and underwood. The pattern of changes in the undergrowth was defined on the basis of the physical and chemical properties of soil. The form of the stand and the underwood layer tended to become similiar to that occurring in nature. The parks have not been maintained for a long time and the undergrowth layer showed differences according to the clay fraction and humus contens of soil, light conditions and available nitrogen and phosporus.

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