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Pure black alder stands are specific and require adapted silvicultural models. To determine the best intensity of selective thinning in such stands, research plots were established in Polanski Log in 1967. Three thinning intensities were selected: control, moderate and high. These stands are presently in a mature phase. In 1967, 1973, 1979, 1983, 1993, 1998 and 2018 diameter at breast height was measured and social status, vitality, tendency, silvicultural role, crown length and overall qualitywere estimated. The differencesin black alderresponsesto thinning intensitieswere analysed and the results were compared with recommendations for selective high thinning and newer crop tree situational thinning models. Diameter increments were lower than expected regardless of thinning intensity. In moderately thinned plots and control plots diameterincrementwasthe same (0.33 cm/year); high intensity thinning plots showed higherincrement(0.37 cm/year). Dominant trees had slightly higherincrementregardless of thinning model. Compared to thinning models with a lower number of crop trees, density and basal area of studied stands were significantly higher and diameter increments lower. We attribute the small diameter increments and small differences among thinning modelsto insufficient intensity and partially to inconsistent thinning. The resultsindicate that thinning must be of higher intensity and the largest-diameter trees which display the best vigour, quality, tendency, and which have well formed, long crowns, must be promoted from the beginning.

Response of black alder (Alnus glutinosa (L.) Gaertn.) to selective thinning of various intensities