ǂa ǂhalf-century study in northeastern Slovenia
Simon Lendvai (Author), Jurij Diaci (Author), Dušan Roženbergar (Author)

Abstract

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.

Keywords

redčenje;tradicionlani model izbiranja;model situacijskega redčenja;črna jelša;Alnus glutinosa (L.) Gaertn.;Slovenija;black alder;thinning;diameter increment;traditional selection model;situational thinning model;Slovenia;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL BF - Biotechnical Faculty
UDC: 630*24
COBISS: 30073859 Link will open in a new window
ISSN: 0373-1332
Views: 371
Downloads: 151
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Croatian
Secondary title: Odziv crne johe (Alnus glutinosa (L.) Gaertn.) na različite intenzitete selektivne prorjedee
Secondary keywords: redčenje;tradicionlani model izbiranja;model situacijskega redčenja;črna jelša;Alnus glutinosa (L.) Gaertn.;Slovenija;
Type (COBISS): Article
Pages: str. 367-378
Volume: ǂVol. ǂ144
Issue: ǂiss. ǂ7/8
Chronology: 2020
DOI: 10.31298/sl.144.7-8.3
ID: 12064922