Neno Aleksandrov, Elena Rafailova

University of Forestry - Sofia

The development nowadays forestry, tend to dominate the principles of sustainable, multifunctional and adaptive management.

The management of beech forests in the middle of last century is not based on scientific approach and is subject to political situation which do not take into account the multifuctionality of the of these forests. As a result, the structures of beech forests have changed greatly in the direction of simplification.

Contemporary researches on the natural dynamics of beech forests confirm the opinion that they are mostly influenced by small area natural disturbances. It follows that the close to nature management of beech forests should be based on silvicultural systems with natural regeneration in small-size gaps - shelterwood with extended regeneration period and group selection felling.

Kostadin Broshtilov

Oak Forest Experimental Station, Burgas 

The final data resulting from the testing of 10 vegetative generations of white acacia (Robinia pseudoacacia L.) growing on the habitat of average productivity, where chromic luvisoil is available, have been communicated herein, being the above cited off-springs of the most frequent use for a creation of cultures belonging to this species. The selection of the generations has been made in the Northern Bulgaria, during the Eighties years of the Twentieth century. There are 8 of the above said species which have entered the variety network in the Northern Bulgaria.

The best growth, in the conditions where a dry up to a fresh chromic luvisoil is available, has been found out for the generations as flowing: OBRETENIK 4 and PORDIM 12. Similar to the former ones result ORYAHOVO 3 and ORYAHOVO 6 generations. Generations as RYAHOVO 1 and the HUNGARIAN BRANCH NYIRSEGI have shown a moderate growth being their stalks of the highest quality, instead. These generations are appropriate for wood production by local plants of an average productivity, growing on chromic luvisoils.

It is OBRETENIK 4 which is considered the best generation to be used for a raise of the productivity of the acacia cultures onto the local plants of an average productivity grown on chromic luvisoils and for wood production of a better quality. This generation could be registered as a branch after a co-ordination of those results which would be gain from the testing made in the Northern Bulgaria, as well (which will be provided by the Experimental Station of Fast Growing Forest Trees Species in the Town of Svishtov). That will certainly enlarge the possibilities for the use of materials for selection when the white acacia species is grown in Bulgaria. 

Hristo Tsakov, Alexander Delkov, Hristina Hristova

Institute of Forestry - Bulgarian Academy of Sciences

Black locust (Robinia pseudoacacia L.) is the most frequently used tree species for reclamation of industrial landscapes. As a result of 10-year-long investigations, short analysis has been made of growth in height and thickness of 10 randomly chosen plant communities (biogroups), formed by dominant (DP), co-dominant (CD), middle pressed (MP) and depressed (DP) black locust trees. Studies included observations of mechanical sustainability (Kms) of trees affected by strong winds.

Danail Doychev1, Sonja Bencheva1, Irina Hristova2, Alexander Dunchev2<

 1 University of Forestry - Sofia; 2 Vitosha Nature Park Directorate

The cerambycid fauna (Coleoptera: Cerambycidae) of the Vitosha Natural Park and Bistrishko Branishte Biosphere Reserve were examined on the basis of published data and studies in 2008. As a result 101 species were established for the Vitosha Natural Park and twenty two of which were known for the reserve. The species of the park belong to the six Bulgarian subfamilies of Cerambycidae as follows: Prioninae - 1 species, Lepturinae - 34 species, Necydalinae - 2 species, Spondylinae - 7 species, Cerambycinae - 25 species and Lamiinae - 32 species. New larval host plants were defined for 3 species of Cerambycidae as follows: for Rhagium inquisitor - Salix caprea, for Rh. bifasciatum - S. caprea and Prunus avium, for Xylosteus bartoni - Corylus avellana and Betula pendula.

Vencislav Markov1, Georgi Markov2

1Space Research Institute, BAS; 2Institute of Zoology, BAS

Examined is the possibility of using behavior of wild animals as natural mobile sensors for early detection of fires in the natural environment. Described species are suitable for use as bio indicators in determining the different types of fires. There are appropriate methods and systems for collecting and processing information and adoption of decisions on the presence of fire at the initial stage of its development. Assessed the place of the proposed system in an integrated system for early forest fire detection and its ability to use in scientific research and discovery of the sudden death of bio indicators are discussed.