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The Instrumental Health Condition Assessment of Two Elderly Sessile Oak Stands in the Börzsöny Mountains and the Gödöllő Hills
Published August 21, 2020
359-364

Many of the climate change researchers believe that in this century the average temperature is expected to rise apart from the climate becoming more extreme (Solomon et al., 2007). These weather anomalies can significantly influence the living beings, including the range limits of plants. This could seriously effect our indigenous tree species,... some prognoses assume that the 82-100 % of the zonal spread of the sessile oak will have fallen outside the optimum climate area in tthe Carpathian Basin by 2050 (Czúcz et al., 2013). Such and similar forecast make the climate tolerance and health condition examinations of the sessile oak stands particularly important, so that we can measure the changes in plant communities. We have examined the health conditions of two elderly - over the age of 100 years - stands with the FAKOPP +D Acoustic Tomograph. One of the stands can be found in the Börzsöny Mountain, s while the other one in the Gödöllő Hills.

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The Bioeconomic Study of Black Locust and Tree of Heaven
Published August 21, 2020
21-28

In our research we studied the economic potential; curbing costs; and elements of these of two woody stemmed invasive species: black locust (Robinia pseudoacacia L.) and tree of heaven (Ailanthus altissima Mill.) in a period 5 years. Questionnaires were sent to the relevant state institutions (national park directorates and state forest compani...es), other publicly available background information was collected and telephone interviews were carried out to complete the data. During the evaluation of data we found that the costs of black locust reduction were so high in national park directorates that they could not be compensated by the revenue from the sale. However, in the case of state forest companies, incomes were several times higher than costs each year. The judgment of tree of heaven was negative in all areas, so it could not be sold.

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Study of Diversity of Different-Age Groups Sessile Oak Stands in The Börzsöny Mountains
Published August 6, 2020
35-39

Coenological based diversity examinai ons were carried out in the Börzsöny off set on the sessile oak dominated stands. To reveal the sylviculture’s eff ects on the biodiversity, in 6 forest stands, characterised by same standard parameters were carried. The Shannon- and Simpson- diversity indices were used for comparison of biodiversity va...lues of diff erent age-groups. Altogether 88 vascular plant species (15 trees, 11 shrubs, 62 herbaceous taxa) were ideni fi ed in the stands of sessile oak woodlands. The diversity of the canopy level was the highest at the 19 year-old stand, and the lowest at the oldest, 92 year-old stand. The diversity of the shrub layer was the highest at the 61 year-old and lowest at the 2 year-old stand. In case of the ground level increasing diversity values were noi ced between the 2 and 61 years old groups, then the diversity values decreased at the stands which are older than 61.

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