Abstract
The main focus of the study was to find out whether and how the forestry management in the Białowieża Forest has influenced the mosaic diversity of field layer vegetation and habitat heterogeneity in the temperate hard wood forest (Tilio-Carpinetum). Five belt-transects represent natural and semi-natural old-growths in Białowieża National Park (BNP), the commercial forest (CF), and secondary stands in the CF. Along the transects, distinct patches of field layer vegetation were identified and delimited, and their species composition was assessed. Along central lines of the transects the environmental data was collected from sample points established at regular intervals: soil pH and the distances to the 4 closest trees, their species, and dbh (diameter at the breast height=135 cm). The group of patches (on average 50 per transect) was subjected to the dichotomous classification in order to identify a number of characteristic types of microphytocoenoses – synusiae. Beta-diversity of the vegetation was expressed with the Simpson diversity index calculated on the basis of areas occupied by synusiae. The most structurally diversified were the transects representing natural old-growths in the BNP. A calculation of similarity coefficients between the transects on the basis of their mosaic composition displayed sharper differences between old-growth and secondary communities in summer than those found in spring. Forestry management has seriously modified the tree species composition in two studied stands, through planting oak or initiating succession. This resulted, both in plantation and pioneer stand, in loss of the main components of natural old-growths: hornbeam (Carpinus betulus), Norway spruce (Picea abies), lime (Tilia cordata) and maple (Acer platanoides). Significantly a wider range of soil pH values in natural old-growths coincided with a higher diversity of herbaceous mosaics comparing to secondary stands. The elimination of spruce (the species being most commonly blown down, projecting an acid canopy shadow) in two studied areas, elimination of dead wood, and destruction of humus layers through ploughing, could contribute to a reduction of specific microenvironments. A lower mosaic diversity of secondary stands coinciding with the unification of environmental conditions along the transects may indicate that forestry management can lead to the disappearance of a highly structural character in natural forest communities.
Nomenclature: Flora europaea; Sokołowski (1993).
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Bobiec, A. The mosaic diversity of field layer vegetation in the natural and exploited forests of Białowieża. Plant Ecology 136, 175 (1998). https://doi.org/10.1023/A:1009736823553
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DOI: https://doi.org/10.1023/A:1009736823553