engleski

Analysis of inuence of seedling type and quality on the outplanting success after disturbances in Norway spruce forest culture

Norway spruce is the object of numerous discussions because it is susceptible to a number of diverse biotic and abiotic inuences, which result with signicant economic losses and negative ecological consequences. Areas after disturbances need to be restored, while Norway spruce is often replaced with broadleaves or mixtures of conifer and broadleaved tree species. Research included restoration after disturbances in gaps and on larger area after strong bark beetle attack and windthrow on Bistranska gora locality (Central Croatia). Data collected from 2010. – 2013. (height, basal diameter, quality indices and height increment) were compared using Statistica soft. Repeated measures ANOVA was conducted for dierent age, quality and type of planting material (European beech seedlings). Replacement by seeding and planting under shelterwood of spruce trees was also included in the research, with the aim of comparison with restoration methods (hemispherical photographs used to document the light availability). The use of the shelterwood method gives the best results for Norway spruce replacement, so it is strongly recommended for one to establish a new forest culture (a mixed one) with a bigger share of broadleaved tree species before disturbance takes place. Nevertheless, the success of ball-rooted seedlings planted after disturbances on the large area showed the best results in terms of height and basal diameter increment, but lowest in terms of quality. Research provides basic knowledge of current restoration needs, risks and silvicultural methods for the Central part of Croatia, as well as a valuable scientic insight into restoration methods on the European level.

Economic losses ; negative ecological consequences ; areas after disturbances ; reforestation.

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