Maryiana Lyubenova - Academia.edu (original) (raw)
Papers by Maryiana Lyubenova
III International Chestnut Congress, 2005
... Ecosystems in Bulgaria Svetla Bratanova-Doncheva and Violeta Dimitrova Central Laboratory of ... more ... Ecosystems in Bulgaria Svetla Bratanova-Doncheva and Violeta Dimitrova Central Laboratory of General Ecology BAS, 1113 Sofia Nо2 Gagarine Bulgaria Mariana Lyubenova Sofia University Faculty of Biology Sofia, 1000 Sofia bul. D. Tzankov No8 Bulgaria ...
III International Chestnut Congress, 2005
I European Congress on Chestnut - Castanea 2009, 2010
The results from investigation of the turnover of the macroelements K, Ca, Na, Mg, P, N and micro... more The results from investigation of the turnover of the macroelements K, Ca, Na, Mg, P, N and microelements Fe, Mn, Pb, Zn and Cu in three model chestnut communities from the north slopes of Belasitza Mountain in Bulgaria are presented. The assessment of the accumulated amounts in the phytomass and their allocation to layers and fractions are carried out. The annual capacity of the biological turnover and the allocation of the annual accumulated amount for the layers and fractions are estimated. The characteristic of the type of the turnover according prevailing elements in the phytomass and annual production are determined. The intensity of the turnover of the investigated bioelements is made.
Chestnut blight, or chestnut bark disease, is caused by an introduced fungus, Cryphonectria paras... more Chestnut blight, or chestnut bark disease, is caused by an introduced fungus, Cryphonectria parasitica (Murrill) Barr, (formerly Endothia parasitica [Murrill] Anderson & Anderson). The fungus have been suggested in several studies to be a main factor to the problem of chestnut decline in Europe. Nevertheless, it is interesting to make a more detailed analysis of the factors which can influence chestnut health. Dendrochronology is the science of extracting ecological information from dated tree rings. Information about environmental occurrences or changes is documented in a tree in various ways. To further the understanding of the dendrochronological characteristics that are important for dating purposes this poster discusses an investigation based on dendrochronological assessment of living chestnut trees. The analysis was performed by the crossdating of chestnut chronologies of different provenances (Belasitza mountain and Western Balkans-Berkovitza mountain), and the interspecific synchronization with oak stands.
The purpose of this article is to evaluate the toxicological effect of wastewater emitted from &q... more The purpose of this article is to evaluate the toxicological effect of wastewater emitted from "Radomir Metal Industries". It has been registered that the range of 50% mortality (LC50) of great water flea (Daphnia magna St.) is limited between 75% and 80% effluent. The data mortality rate-effluent dilution for Pseudorasbora parva well correlated with linear regression, R2=0.86. LC50 is reported from exposure to raw sewage (100%). Results indicate that even when individual concentrations of toxic metals are within the permissible limits the effluent remains toxic for the hydrobiota perhaps due to the combine effect of the contaminants.
Phytocoenologia, 2016
The Balkan Vegetation Database (BVD; GIVD ID: EU-00-019; http://www.givd.info/ID/EU-00- 019) is a... more The Balkan Vegetation Database (BVD; GIVD ID: EU-00-019; http://www.givd.info/ID/EU-00- 019) is a regional database that consists of phytosociological releves from different vegetation types from six countries on the Balkan Peninsula (Albania, Bosnia and Herzegovina, Bulgaria, Kosovo, Montenegro and Serbia). Currently, it contains 9,580 releves, and most of them (78%) are geo-referenced. The database includes digitized releves from the literature (79%) and unpublished data (21%). Herein we present descriptive statistics about attributive releve information. We developed rules that regulate governance of the database, data provision, types of data availability regimes, data requests and terms of use, authorships and relationships with other databases. The database offers an extensive overview about studies on the local, regional and SE European levels including information about flora, vegetation and habitats.
Classification-oriented databases are developed to facilitate users with classified data in diffe... more Classification-oriented databases are developed to facilitate users with classified data in different areas of sciences. This paper presents computer modelling of plant and terrestrial classification. A database scheme implementing this presentation is proposed. The offered approach is illustrated with a sample classification; the approach is expedient, convenient and useful because it reflects the hierarchical and complex structure of natural systems. Classification-oriented databases give unlimited possibilities to create different consequently human developed models according to the aims laid. The database is sufficiently flexible and allows making various combinations of different parameters from different classification units. In this way scientists can examine natural systems from different points of view and create more realistic and adaptive models. Key words: terrestrial ecosystems, classification, vegetation, database scheme
castbelbg.com
... Structural and phytosociological features of the Tuscan C. sativa woods. Parlatorea, 5, 5599... more ... Structural and phytosociological features of the Tuscan C. sativa woods. Parlatorea, 5, 5599. Assyov, B., А. Petrova. (eds). 2006. Conspectus of the Bulgarian Vascular Flora. Distribution Maps and Floristic Elements. Ed. 3. BBF, Sofia, 454 pp. Bergmeier, E., P. Dimopoulos. ...
Biotechnology & Biotechnological Equipment, 2012
The purpose of this article is to evaluate the toxicological effect of wastewater emitted from "R... more The purpose of this article is to evaluate the toxicological effect of wastewater emitted from "Radomir Metal Industries". It has been registered that the range of 50% mortality (LC50) of great water flea (Daphnia magna St.) is limited between 75% and 80% effluent. The data mortality rate-effluent dilution for Pseudorasbora parva well correlated with linear regression, R 2 =0.86. LC50 is reported from exposure to raw sewage (100%). Results indicate that even when individual concentrations of toxic metals are within the permissible limits the effluent remains toxic for the hydrobiota perhaps due to the combine effect of the contaminants.
The paper deals with the five key aspects needed for scientific community consideration in order ... more The paper deals with the five key aspects needed for scientific community consideration in order to optimize the global and regional modelling. The applying of some elements of ecological theory as a fundament of models object selection is recommended, as well as development of the theory of plant functional types (PFTs), improving the methods and indicators selection. The ecological systems from different levels of organization are considered as the adaptive complex systems (ACS). The complex relations in site and out site of these systems are discussed.
The paper presents an original mathematical approach for analysing the periods with low radial gr... more The paper presents an original mathematical approach for analysing the periods with low radial growth (stress periods) of trees. This approach enables us to determine with relatively high probability the radial growth basic optimal and adverse periods, as well as to recognize the main ecological regimes causing them. In the created software, SP-PAM, parameters as: interval, cardinality (Card), coverage (Co %), average duration, frequency, amplitude, alpha, standard deviation and confidence are used. The programme verification is done with data from a dendroecological research of Quercus frainetto Ten., Q. cerris L. and Q. dalechampii Ten., carried out mainly in Sofia region. The published data of the adverse growth years for oak forests in Bulgaria (1945Bulgaria ( , 1950Bulgaria ( and 1968) is confirmed. Other adverse years for radial growth of investigated oaks are also determined.
GEORGIEVA, N., K. PACHEDJIEVA and M. LYUBENOVA, 2013. SCI "Zapadna Stara Planina and Predbalkan" ... more GEORGIEVA, N., K. PACHEDJIEVA and M. LYUBENOVA, 2013. SCI "Zapadna Stara Planina and Predbalkan" -fl oristic studies on xerothermic oak forests. Bulg. J. Agric. Sci., Supplement 2, The main aim in the present study is to identify the fl oristic diversity of xerothermic oak forests with predomination of Quercus cerris L. and Quercus frainetto Ten. in SCI "Zapadna Stara planina i Predbalkan". The inventory of the fl oristic complex resulted in more than 100 species of higher plants that belong to almost 80 genera and 40 families represented in the Bulgarian vascular fl ora. The biological spectrum made based on Raunkiaer's life forms shows the predominance of hemicryptophytes and takes an intermediate position between the spectrums of the forests in the temperately warm and temperately cold zone. The phytogeographical spectrum shows the predominance of European-Asian and subMediterranean fl oral elements which are represented equally (about 20% each). They are followed be the European, European-Mediterranean and sub-Boreal fl oral elements (about 11% each). The anthropophytes are also discussed. The results of the present study will be a fundament of a further complex investigations of the xerothermic oak forests in the protected site and will be useful for the defi ning of succession processes in the discussed forests.
The present paper reports on results from the first attempt to study and classify the vegetation ... more The present paper reports on results from the first attempt to study and classify the vegetation of sweet chestnut forests in Bulgaria using the phytosociological approach. The study was carried out in the Belasitsa Mountain, south-western Bulgaria. A total of 272 species of higher plants were identified. The established floristic similarity (30-40%) seemed not enough to identify clear plant associations and the clusters were related to higher syntaxa -class, order, alliance. It could be hypothesized that the studied vegetation belongs to one association. Following the Braun-Blanquet phytosociological method [ 1 ] the described plant communities are related to the class Quercetea robori-petraeae, order Quercetalia robori-petraeae, alliance Quercion robori-petraeae. The investigated communities showed similarity with the association Castanetum sativae-macedonicum Nikolovski (1951) subass. fagetosum Em 60 from Macedonia. At the present stage of knowledge we can assign (with some degree of caution) the studied vegetation to the above mentioned association.
III International Chestnut Congress, 2005
... Ecosystems in Bulgaria Svetla Bratanova-Doncheva and Violeta Dimitrova Central Laboratory of ... more ... Ecosystems in Bulgaria Svetla Bratanova-Doncheva and Violeta Dimitrova Central Laboratory of General Ecology BAS, 1113 Sofia Nо2 Gagarine Bulgaria Mariana Lyubenova Sofia University Faculty of Biology Sofia, 1000 Sofia bul. D. Tzankov No8 Bulgaria ...
III International Chestnut Congress, 2005
I European Congress on Chestnut - Castanea 2009, 2010
The results from investigation of the turnover of the macroelements K, Ca, Na, Mg, P, N and micro... more The results from investigation of the turnover of the macroelements K, Ca, Na, Mg, P, N and microelements Fe, Mn, Pb, Zn and Cu in three model chestnut communities from the north slopes of Belasitza Mountain in Bulgaria are presented. The assessment of the accumulated amounts in the phytomass and their allocation to layers and fractions are carried out. The annual capacity of the biological turnover and the allocation of the annual accumulated amount for the layers and fractions are estimated. The characteristic of the type of the turnover according prevailing elements in the phytomass and annual production are determined. The intensity of the turnover of the investigated bioelements is made.
Chestnut blight, or chestnut bark disease, is caused by an introduced fungus, Cryphonectria paras... more Chestnut blight, or chestnut bark disease, is caused by an introduced fungus, Cryphonectria parasitica (Murrill) Barr, (formerly Endothia parasitica [Murrill] Anderson & Anderson). The fungus have been suggested in several studies to be a main factor to the problem of chestnut decline in Europe. Nevertheless, it is interesting to make a more detailed analysis of the factors which can influence chestnut health. Dendrochronology is the science of extracting ecological information from dated tree rings. Information about environmental occurrences or changes is documented in a tree in various ways. To further the understanding of the dendrochronological characteristics that are important for dating purposes this poster discusses an investigation based on dendrochronological assessment of living chestnut trees. The analysis was performed by the crossdating of chestnut chronologies of different provenances (Belasitza mountain and Western Balkans-Berkovitza mountain), and the interspecific synchronization with oak stands.
The purpose of this article is to evaluate the toxicological effect of wastewater emitted from &q... more The purpose of this article is to evaluate the toxicological effect of wastewater emitted from "Radomir Metal Industries". It has been registered that the range of 50% mortality (LC50) of great water flea (Daphnia magna St.) is limited between 75% and 80% effluent. The data mortality rate-effluent dilution for Pseudorasbora parva well correlated with linear regression, R2=0.86. LC50 is reported from exposure to raw sewage (100%). Results indicate that even when individual concentrations of toxic metals are within the permissible limits the effluent remains toxic for the hydrobiota perhaps due to the combine effect of the contaminants.
Phytocoenologia, 2016
The Balkan Vegetation Database (BVD; GIVD ID: EU-00-019; http://www.givd.info/ID/EU-00- 019) is a... more The Balkan Vegetation Database (BVD; GIVD ID: EU-00-019; http://www.givd.info/ID/EU-00- 019) is a regional database that consists of phytosociological releves from different vegetation types from six countries on the Balkan Peninsula (Albania, Bosnia and Herzegovina, Bulgaria, Kosovo, Montenegro and Serbia). Currently, it contains 9,580 releves, and most of them (78%) are geo-referenced. The database includes digitized releves from the literature (79%) and unpublished data (21%). Herein we present descriptive statistics about attributive releve information. We developed rules that regulate governance of the database, data provision, types of data availability regimes, data requests and terms of use, authorships and relationships with other databases. The database offers an extensive overview about studies on the local, regional and SE European levels including information about flora, vegetation and habitats.
Classification-oriented databases are developed to facilitate users with classified data in diffe... more Classification-oriented databases are developed to facilitate users with classified data in different areas of sciences. This paper presents computer modelling of plant and terrestrial classification. A database scheme implementing this presentation is proposed. The offered approach is illustrated with a sample classification; the approach is expedient, convenient and useful because it reflects the hierarchical and complex structure of natural systems. Classification-oriented databases give unlimited possibilities to create different consequently human developed models according to the aims laid. The database is sufficiently flexible and allows making various combinations of different parameters from different classification units. In this way scientists can examine natural systems from different points of view and create more realistic and adaptive models. Key words: terrestrial ecosystems, classification, vegetation, database scheme
castbelbg.com
... Structural and phytosociological features of the Tuscan C. sativa woods. Parlatorea, 5, 5599... more ... Structural and phytosociological features of the Tuscan C. sativa woods. Parlatorea, 5, 5599. Assyov, B., А. Petrova. (eds). 2006. Conspectus of the Bulgarian Vascular Flora. Distribution Maps and Floristic Elements. Ed. 3. BBF, Sofia, 454 pp. Bergmeier, E., P. Dimopoulos. ...
Biotechnology & Biotechnological Equipment, 2012
The purpose of this article is to evaluate the toxicological effect of wastewater emitted from "R... more The purpose of this article is to evaluate the toxicological effect of wastewater emitted from "Radomir Metal Industries". It has been registered that the range of 50% mortality (LC50) of great water flea (Daphnia magna St.) is limited between 75% and 80% effluent. The data mortality rate-effluent dilution for Pseudorasbora parva well correlated with linear regression, R 2 =0.86. LC50 is reported from exposure to raw sewage (100%). Results indicate that even when individual concentrations of toxic metals are within the permissible limits the effluent remains toxic for the hydrobiota perhaps due to the combine effect of the contaminants.
The paper deals with the five key aspects needed for scientific community consideration in order ... more The paper deals with the five key aspects needed for scientific community consideration in order to optimize the global and regional modelling. The applying of some elements of ecological theory as a fundament of models object selection is recommended, as well as development of the theory of plant functional types (PFTs), improving the methods and indicators selection. The ecological systems from different levels of organization are considered as the adaptive complex systems (ACS). The complex relations in site and out site of these systems are discussed.
The paper presents an original mathematical approach for analysing the periods with low radial gr... more The paper presents an original mathematical approach for analysing the periods with low radial growth (stress periods) of trees. This approach enables us to determine with relatively high probability the radial growth basic optimal and adverse periods, as well as to recognize the main ecological regimes causing them. In the created software, SP-PAM, parameters as: interval, cardinality (Card), coverage (Co %), average duration, frequency, amplitude, alpha, standard deviation and confidence are used. The programme verification is done with data from a dendroecological research of Quercus frainetto Ten., Q. cerris L. and Q. dalechampii Ten., carried out mainly in Sofia region. The published data of the adverse growth years for oak forests in Bulgaria (1945Bulgaria ( , 1950Bulgaria ( and 1968) is confirmed. Other adverse years for radial growth of investigated oaks are also determined.
GEORGIEVA, N., K. PACHEDJIEVA and M. LYUBENOVA, 2013. SCI "Zapadna Stara Planina and Predbalkan" ... more GEORGIEVA, N., K. PACHEDJIEVA and M. LYUBENOVA, 2013. SCI "Zapadna Stara Planina and Predbalkan" -fl oristic studies on xerothermic oak forests. Bulg. J. Agric. Sci., Supplement 2, The main aim in the present study is to identify the fl oristic diversity of xerothermic oak forests with predomination of Quercus cerris L. and Quercus frainetto Ten. in SCI "Zapadna Stara planina i Predbalkan". The inventory of the fl oristic complex resulted in more than 100 species of higher plants that belong to almost 80 genera and 40 families represented in the Bulgarian vascular fl ora. The biological spectrum made based on Raunkiaer's life forms shows the predominance of hemicryptophytes and takes an intermediate position between the spectrums of the forests in the temperately warm and temperately cold zone. The phytogeographical spectrum shows the predominance of European-Asian and subMediterranean fl oral elements which are represented equally (about 20% each). They are followed be the European, European-Mediterranean and sub-Boreal fl oral elements (about 11% each). The anthropophytes are also discussed. The results of the present study will be a fundament of a further complex investigations of the xerothermic oak forests in the protected site and will be useful for the defi ning of succession processes in the discussed forests.
The present paper reports on results from the first attempt to study and classify the vegetation ... more The present paper reports on results from the first attempt to study and classify the vegetation of sweet chestnut forests in Bulgaria using the phytosociological approach. The study was carried out in the Belasitsa Mountain, south-western Bulgaria. A total of 272 species of higher plants were identified. The established floristic similarity (30-40%) seemed not enough to identify clear plant associations and the clusters were related to higher syntaxa -class, order, alliance. It could be hypothesized that the studied vegetation belongs to one association. Following the Braun-Blanquet phytosociological method [ 1 ] the described plant communities are related to the class Quercetea robori-petraeae, order Quercetalia robori-petraeae, alliance Quercion robori-petraeae. The investigated communities showed similarity with the association Castanetum sativae-macedonicum Nikolovski (1951) subass. fagetosum Em 60 from Macedonia. At the present stage of knowledge we can assign (with some degree of caution) the studied vegetation to the above mentioned association.
The air pollutants such as gaseous, aerosols and dust effect directly and indirectly on plants le... more The air pollutants such as gaseous, aerosols and dust effect directly and indirectly on plants leaves with or without visible damages. The leaf is a part of the plant that first and most obviously exhibit visible symptoms of injury and that can serve as bioindicator for tolerance of the species. Nevertheless, even without visible injures, biochemical, physiological and cellular changes can take place to mitigate stress and the ample used of the plant internal resources. Typically under ambient air pollution tree plants adapt through leaf blade modifications. Evaluation of leaf alterations in plants exposed to air pollution is an important task for biological monitoring and mitigation strategies.