The dynamics of stiff clubmoss Lycopodium annotinum L. patches in clumps of trees left on the clear-cutting in pine forest Leucobryo-Pinetum

Clumps of trees left on the clear-cuttings have an important role in protecting populations of endangered plant species against destruction during silviculture activities. The aim of this study is to describe the changes in the area of the Lycopodium annotinum patches. The area of L. annotinum patch in clump of trees, have been significantly reduced during 5 years after clear-cut. In the first year of the observations, the studied population occupied an area of 69.8 m² whereas in 2012, it was only 37.5 m². Most of the shoots were withered away on the south side of the clump. The probable reason was too strong insolation. Shoots that survived were located in the north part of the clump – shielded by young trees and shrubs layer. At this time, the control patch of L. annotinum located inside the forest increased its area. Before the clear-cuttings, the annual growth of vertical shoots of clubmoss was higher in the patch located in future tree clump. After the clear-cutting, growth of shoots in this patch was shorter than in patch located all the time inside the forests. The most effective growth was observed in the third studied patch located in the clear-cutting border. The explanation for this phenomenon could be the higher humidity of habitat on this site. Clumps of trees left after the clear-cutting contribute to the protection of endangered populations, but do not eliminate the significant microhabitat changes. The clubmoss patches located in moist habitats are more likely to survive even if they are partially exposed to the sunlight.