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Response of black alder (Alnus glutinosa (L.) Gaertn.) to selective thinning of various intensitiese : a half-century study in northeastern Slovenia
Lendvai, Simon (Author), Diaci, Jurij (Author), Roženbergar, Dušan (Author)

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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.

Language:English
Keywords:black alder, Alnus glutinosa (L.) Gaertn., thinning, diameter increment, traditional selection model, situational thinning model, Slovenia
Work type:Article (dk_c)
Tipology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Year:2020
Number of pages:str. 367-378
Numbering:Vol. , iss. 7/8
UDC:630*24
ISSN on article:0373-1332
DOI:10.31298/sl.144.7-8.3 Link is opened in a new window
COBISS.SI-ID:30073859 Link is opened in a new window
License:CC BY-NC-ND 4.0
This work is available under this license: Creative Commons Attribution Non-Commercial No Derivatives 4.0 International
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Record is a part of a journal

Title:Šumarski list
Shortened title:Šumar. list
Publisher:Savez inženjera i tehničara šumarstva i drvne industrije Hrvatske
ISSN:0373-1332
COBISS.SI-ID:30498 This link opens in a new window

Secondary language

Language:Croatian
Title:Odziv crne johe (Alnus glutinosa (L.) Gaertn.) na različite intenzitete selektivne prorjedee : pedesetgodišnja istraživanja u sjeveroistočnoj Sloveniji
Keywords:redčenje, tradicionlani model izbiranja, model situacijskega redčenja, črna jelša, Alnus glutinosa (L.) Gaertn., Slovenija

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