Vecna pot 2, 1000 Ljubljana
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Presoja uspešnosti obnove gozdov s sadnjo in setvijo v Sloveniji

Project status:  active
Project Leader: prof. dr. Hojka Kraigher

Department for Forest Physiology and Genetics

Project group:


Bajc Marko


Božič Gregor


Brglez Ana


De Groot Maarten


Grebenc Tine


Hrenko Melita


Jagodic Špela


Kavčič Andreja


Kovač Marko


Kraigher Hojka


Mrak Tanja


Ogris Nikica


Piškur Barbara


Smolnikar Peter


Štupar Barbara


Unuk Tina


Westergren Marjana


Železnik Peter


Reforestation with planting and sawing is, in the short term, among all forestry measures by far the most expensive measure, which limits its implementation, and the decisions about such forest reforestation must be thoroughly thought out. Due to the long lifespan and the reproductive biology of forest trees, decisions taken at the time of reforestation of forests that we accept today is of crucial importance, as all later "repairs" would only be possible with substantial financial and labour inputs. Unsuccessful or inappropriate reforestation / regeneration can also lead to the destruction of forest stands and changes in their long-term stability and growth. In this perspective, forest reforestation or regeneration is no longer the most expensive measure!

Since 1995, there have been three large-scale ice-sleets in Slovenia, three major fires, three wind throws and at least one snow-brake or large proportions. Through these large scale disturbances (without the last windthrows) 2,000 ha of forests were destroyed and 950,000 ha heavily damaged. Furthermore some long-lasting droughts in 2003 and after 2014 have lead to large scale heavy bark beetle gradations. In such conditions natural regeneration of degraded areas is not sufficient to provide services within the desired timeframe, which the forests provide.

An important part of the project is the analysis of the current forest reforestation with planting and sawing. We shall examine the extent of seedlings planned and used regarding the areas and in financial terms and provide an indicative assessment of the impact of planting on the development of forests. An important factor in assessing the performance so far is the analysis of the success of planting or the survival of the seedlings, since the effectiveness of artificial restoration depends on many factors. Factors of living nature, such as game, many pathogenic organisms, bacteria, insects and other harmful organisms, and factors of non-living nature, have a significant impact. The project will analyze the performance at selected forest sites. We shall also analyze fructification in areas of major natural disasters in the last 25 years. The acquired knowledge and measures to reduce damage to seedlings and natural regeneration centers will be included in the updated guidelines as recommendations for forest owners, forest nurseries and professionals within the public forestry service, who are responsible for planting and tending of the young forest.

The objectives of the project are:

to evaluate the success of reforestation with planting and sawing in Slovenian forests in the last 25 years (share in the total regeneration, the success of the the efforts in terms of invested resources, the impact on the achievement of forestry goals),

to prepare the methodology for deciding on the extent of reforestation with planting and sawing in the forest at the level of forest management plans, separately for regular silviculture and for reforestation after large scale disturbances according to the appropriateness of tree species and the type of seedlings used,

to elaborate detailed criteria in seedling quality assessment procedures,

to compare the health condition of the seedlings with natural regeneration in comparable sites,

to identify the most important harmful organisms that damage the seedlings in the forests and prepare instructions for their identification,

to prepare a catalogue of measures to prevent or reduce damage to seedlings caused by harmful organisms, and to assess the appropriateness of existing measures to protect seedlings,

to prepare detailed instructions for handling seedlings at different stages from nurseries to planting, and

to establish cooperation between researchers and laboratories for determining certain harmful organisms of seedlings in shrubs (participating organizations, especially the National institute of Biology and the Slovenian Agricultural Institute, will be involved with consultations or as subcontractors).


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