engleski

Modeling of felling intensity in young pedunculate oak (Quercus robur L.) stands in order to create earlier forest seed stand

The absence of pedunculate oak (Quercus robur L.) seed crop in Croatia have been disrupted and thus the regeneration of its forests has become increasingly questionable. Experimental plots were established on three locations in Forest administrations Bjelovar (2) and Sisak (1) in second, third and fourth age class. All plots are permanently marked, each consisting of four equal subplots of 0.25 ha, bounded on all sides by a 15 m boundary zone. Each tree is marked by a number and a georeferenced. Statistical analyses of stand and crown structures of the experimental plots were based on the data of the terrain survey at the level of the tree, the level of the subplots and the level of the plots. Criteria for selecting seed trees was determined based on the model of phenotypic selection made by defining the objective criteria for evaluating the tree form, the quality of the crown, the fullness, the spiral grain, the position in the stand and the health status of all the oak trees. In purpose to define criteria for selection of future seed trees, Hasenauers model (1977) was used. Potentially higher crown radius for selected trees were calculated according to their diameters. With analysis of potential crown growth, data about possibility of their growth in forest stands according to age were obtained. On each locality three different intensity of felling on subplots were selected: weak, middle and high. Fourth subplot was used as control. Tree marking and cutting were obtained. This paper represents the very first step in research how to create forest seed stands in young pedunculate oak forests. Therefore, in future this research want to confirm fact that selecting trees and future forest seed stands in earlier age classes can affected on growth of crown diameter and volume. Also, abundant, frequently and crop appearing in earlier age classes is expected.

cutting intensity ; pedunculate oak ; phenotypic selection ; seed stands ; seed yield

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