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Báo cáo lâm nghiệp: " Conversion of even aged forest managed under the system involving coupes to selection forest in Klepačov J. Šilhánek"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Conversion of even aged forest managed under the system involving coupes to selection forest in Klepačov J. Šilhánek. | JOURNAL OF FOREST SCIENCE 54 2008 10 465-475 Conversion of even aged forest managed under the system involving coupes to selection forest in Klepacov J. SlLHANEK Mendel University of Agriculture and Forestry in Brno Masaryk Forest Training Forest Enterprise Krtiny Krtiny Czech Republic ABSTRACT The paper evaluates the development of the tree numbers secondary stand and species composition on eight partial control plots in Klepacov where the conversion of even aged forest managed under the system involving coupes to selection forest has been implemented within the framework of a long-term project. The plots capture various stages of conversion. Plots A D and H still possess structures nearing the forest of age classes. The assessment was made of the measurements taken in 1974 1994 and 2004. Tree numbers on the partial control plots in the diameter degrees 10-70 decreased in the first inventory period as compared with both the model situation and the initial situation in 1974 due to increased felling volumes in that period. The felling and the subsequent opening of stands resulted in a rapidly developing regeneration which manifested itself by the increase in the number of trees in diameter degrees 2 and 6 above the values given by the model curve for these diameter degrees. In the second inventory period tree numbers in these diameter degrees were lower by 11 as compared with the model situation and slightly lower as compared with the initial situation. Moreover the results of the survey show that the forest stands under the selection system of management are massively invaded by broadleaved species namely the beech and that danger exists that broadleaves will dominate in the future. This is generally considered undesirable because the quality of broadleaved stems in the stands under the selection system is low. Keywords conversion to selection forest curve of diameter frequencies secondary stand tree species composition Poor stability and disturbed ecosystem of .