Leaf area index (LAI), production and silvicultural practice in European chestnut (Castanea sativa Mill.) monocultures
Tokar, F.(Slovak Academy of Sciences, Nitra (Slovak Republic). Institute of Forest Ecology)
The work evaluates the influence of over 30 years (1971-2001) repeated thinning from above (positive selection, various degrees, various intervals) on the dynamics of leaf area index (LAI) in tended European chestnut (Castanea sativa Mill.) monocultures on the PRP series (7 partial permanent research plots) Zirany (Forest Enterprise Topolcianky, Forest District Zobor). Over the whole stand development period, the highest LAI values were reached in tended stands treated through heavy thinning from above applied at 10-year intervals (PRP 3, 5, 7). At the stand age of 46 years, the highest LAI value was reached on PRP 3 (6.96 ha/ha). The highest growing stock and the highest total production of aboveground biomass was reached on the PRPs tended through heavy thinning from above with positive selection and 10-year interval of repetition (PRP 3, 5, 7). On these plots, we also reached the highest values of both mean periodical increment and total mean increment. Also in connection to the LAI were the highest values of mean periodical increment reached on the PRP treated with heavy thinning from above repeated at 10-year intervals (5.05, 4.27 and 4.61 g /square dm per year). The stands tended with heavy thinning from above repeated at 10-year intervals provided their promising trees with the most favourable conditions for the above-ground biomass development.
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