Dynamic economic expansion of metropolitan regions in post-communist central Europe induces dynamic traffic growth, which calls for new transport network solutions and improvements to existing transport infrastructure within the regions. This is also the case of Bratislava as the capital city of post-communist Slovakia, which has recently been facing new economic and urban development challenges. A booming labour market, intensive suburbanisation processes, traffic expansion and urban (re-)development bring new conflicts and demand for grand-scale transport projects. An ongoing upgrade of the motorway system in the region of Bratislava will result in the construction of a substantial part of an orbital motorway surrounding the southern and eastern parts of the city. The potential effects of the motorway network-upgrade projects on the city urbanism are probably immense. This paper attempts to evaluate the possible changes in accessibility within the road network after completion of motorway upgrading project D4/R7 in the metropolitan area of Bratislava. The interaction potential of both population and jobs was applied here to assess possible impacts of road network enhancement on accessibility of places of residence and of work.
Soil organic carbon (SOC) is one of the basic parameters of soil productivity and quality. Generally soil has potential to sequestrate or release organic carbon depending on land use/management and climatic conditions. The main aim of this article is to show changes in SOC in agricultural land of Slovakia over almost the last 40 years on the basis of modelling data of SOC stock by the RothC model and unequal development of SOC stock on agro-climatic regions of Slovakia. The results received show that average SOC stock [t/ha] in Slovakia is higher on grasslands in comparison to arable land. However, total SOC pool (t) in top of 0.2 m of soil on the modelling area of agricultural Slovak land shows that a considerable part of SOC stock is located in arable land and is approximately four times greater than on grasslands because the arable land represents about 80% of the modelling area. In the first modelling period (1970-1994), the SOC stock gradually increased, but in the second modelling period (1995-2007) no significant changes in SOC stock on the arable land were observed. In the southwest part of Slovakia, increasing of SOC stock during all modelling periods was observed; however, in the northeast part a slight increase of SOC stock only in the first modelling period (1970-1994) was found and in the second modelling period (1995-2007) decrease of SOC accumulation was observed. The results of this statistical analysis show significant relationship between carbon input/SOC stock as independent variables and agro-climatic regions as dependent variable.