The current research focuses on the investigation of shrubland vegetation in Dragoman municipality. The study is motivated by the willingness of the authors to check the shrubland habitats’ territorial extent and their importance to ecosystem processes, following the increased degree of succession over the last three decades. On the other hand, governmental subsidizing has been common for the last decade, leading to a clearance of lands with shrubs. Shrublands were studied through the application of the Braun-Blanquet approach and were defined by the European Nature Information System (EUNIS) classification. One main habitat type with three subtypes have been defined. Those are the Subcontinental and continental deciduous thickets (F3.24) that covers the largest area, Peri-Pannonic dwarf almond scrub (F3.24122), Moesian oriental hornbeam thickets (F3.2431), Moesian lilac thickets (F3.2432), covering a total area of 52.32 km2. Secondary succession has to be considered among the main reasons for shrubland distribution. The lower number of grazing animals and forest clearings act as boosters for this ecological process. Large areas in Dragoman municipality are characterized also by shallow soils that are unable to sustain forest vegetation, thus giving way to shrubs.

The present study deals with the investigation of soil organic carbon in two water catchments in Northern Rila, Western Bulgaria. Field research, combined with analysis, provided sufficient data. Six key sites were selected and sampled in order to estimate and compare the amount of organic and inorganic carbon in the topsoil. The applied criteria for the choice of sites included: vegetation cover, predominant soil group, level of anthropogenization and transport accessibility. A total number of 13 samples from both catchments were collected and analyzed in the Central laboratory of the Institute of Soil Science, Agrotechnologies and Plant Protection (ISSAPP) “N. Pushkarov“. The results concern the amount and composition of soil organic matter in different soils – Cambisols (Albic, Humic, Dystric), Fluvisols and Umbrosols. The total carbon content of all samples varies between 1.23 and 9.69%. The amount of organic carbon ranges between 0.45 and 3.73%. The results of the study prove once again that the preservation of natural vegetation and current condition of the soil is of great importance for carbon sequestration and climate change mitigation.

In this study the phytocoenoses of Petasites albus, P. hybridus and P. kablikianus were investigated on the territory of Bulgaria and Romania. Numerical classification and ordination were performed by PC-ORD and JUICE software packages. Diagnostic species were determined by calculating the Phi-coefficient. Three associations of the Petasition officinalis alliance were recognized – Petasitetum albae Dihoru ex Nazarov et al. 2022, Petasitetum hybrido-kablikani Sillinger 1933, and Telekio-Petasitetum hybridi Morariu ex Resmeritaet Ratiu 1974.

The current study aims to uncover the forest habitat diversity of Breznik municipality, following the EUNIS Classification. Initial data was collected from the Ministry of Environment and Water and the Forestry Management Plans. Forest habitat polygons were spatially processed with the use of the ArcGIS 10.8.1 software package. Field studies were performed to add more detailed information to the analysis. The phytocoenoses of the forest habitats are dominated by Quercus dalechampii, Q. frainetto, Fagus sylvatica, Carpinus betulus. Some artificial plantations with Pinus nigra and P. sylvestris were also present, as well as with non-native species, such as Robinia pseudacacia and Quercus rubra. The results of this study could be used for more in-depth research of the Breznik municipality vegetation.

The current study investigates the development of the land cover in the mountainous territory of Mala Planina, located in the western part of Stara Planina. It focuses on cameral and terrain research in which basis is the CORINE Land Cover (CLC), initiated by the European Union. All existing databases for the country were applied (CLC 1990, 2000, 2006 and 2012). Each updated version of the CLC data shows typical transformation in Mala Planina’s land cover. A thorough investigation is made about all parts of the mountain and published within the results. Four GIS derived maps are published. The results show that the most significant dissonance occurs between CLC 1990 and the rest CORINE Land Cover data sets (CLC 2000; 2006; 2012) and the reason for the imparity lies mainly in the extensive timeframe. Almost no distinction is observed, when we compare CLC 2006 and 2012. The most common changes are connected with the transition to land principally occupied by agriculture, with significant areas of natural vegetation, which is explained by the decreasing number of population and abandonment of the agricultural areas.