fg

Biogeography

Volume XX |

Comparative analysis on the role of vegetation in controlling the potential effects of gas stations on residential areas

Abstract: When considering human activities with potential negative effects in urban environment, gas stations are a hot topic. For over one century their presence increased associated to the number of vehicles used in cities, and frequently they are associated with residential areas – where the highest number of users are present. Acknowledging their potential effects, gas stations are a response to a high demand in cities – that of mobility. This is especially relevant in Central and Eastern Europe cities (such as Bucharest), which continue to be dominated by cars and alternative models of transportation are present in lower proportions. In the present study we started from extracting with field observations the present characteristics of gas stations in Sector 4 of Bucharest. We applied 31 field observation sheets using Survey 123, containing information about their emplacement and accessibility, the presence and structure of vegetation, etc. We compared results to those of 120 questionnaires applied to the population. Our results revealed the important role the presence of vegetation has on reducing the negative effects of gas stations (both observed and perceived), the differences between populations living in the proximity of gas stations and other residents, and also the fulfilment of legal requirements. We consider our results to be extremely relevant and useful instruments for urban planners and decision-makers in their efforts of improving the quality of life and wellbeing in cities.

Volume XX |

Analysis of the Relationships Between the Phreatic Aquifer and Natura 2000 Habitats from ROSCI0224 Scroviștea

Abstract: The analysis of the relationships between groundwater and terrestrial ecosystems contributes to the conservation of biodiversity and the quantitative and qualitative status of the aquifer.
The main goal of the paper is to analyze the relationships between the phreatic aquifer of ROIL16 (Vlăsia Plain) and the six Natura 2000 habitats from the Site of Community Importance (SCI) ROSCI0224 Scroviștea.
This work is based on hydrogeological, geological data, mathematical modeling of the phreatic aquifer (October 17-19, 2017), and the methodology used for study the relationship between groundwater bodies and terrestrial ecosystems, developed by the R.A.H. (2015).
The evaluation of the dependence (high – A, medium – B, nule – C) relations, between the phreatic aquifer and the habitats, is made mainly by correlating the depth of the hydrostatic level with the depth of the root system of plant and tree species.
The main findings based on the hydrogeological, ecological criteria, and analysis algorithms highlight the fact that most habitats and later the Scroviștea site are dependent on groundwater. The six Natura 2000 habitats (3150, 3160, 91M0, 91F0, 91E0 și 92A0) are analyzed individually concerning the depth of the groundwater level. In the evaluation of the degrees of dependence of the habitats, two other criteria are applied, maximum and arithmetic mean about their extension surface. Thus, four habitats (91M0, 91F0, 91E0, and 92A0) are identified with high dependence on groundwater, and two habitats (3150 and 3160) with nule dependence. Considering only this stage of analysis, it was considered that the SCI Scroviștea has a high dependence on the phreatic aquifer.
For a correct assessment of the dependence relations between groundwater and habitats, analyzes related to the hydrodynamic and hydrochemical regime of the groundwater aquifer and the correlation of this information with analyzes from specialized studies performed for plant and tree species are required.

Volume XVIII |

In search of the last remaining giants. Modelling the conservation potential of century old trees within the Continental and Steppic Biogeographical Regions of Romania

Abstract: The present paper aims to model the potential for conservation of some very large specimens of either indigenous or human introduced tree species located within the Continental and Steppic Biogeographical Regions of Romania, areas characterized by considerable natural diversity. Centuries of human intervention have resulted in the major replacement of the natural vegetation with semi natural forests in the highlands, pastures and permanent crops at the hills and arable land in the lower areas. The once pristine landscapes present numerous remains in the form of old trees, while other exotic introduced species are common. In order to assess their conservation potential, we applied an encyclopedically approach centered on numerous field observations, measurements, scientific literature research, historical maps analyses and discussions with locals. The results certify the existence of different species characterized by a medium and high potential for conservation. Some of them are the subject of numerous researches and possess favorable conservation status while many are poorly or virtually unstudied and not protected. Such findings are usable in complex domains, mainly biodiversity conservation, durable ecosystem management and ecotourism.

Volume XVIII |

Estimating the tourist carrying capacity for protected areas. A case study for Natura 2000 sites from North-Western Romania

Abstract: The estimation of the tourist support capacity for three Natura 2000 sites located in North-Westerm Romania and the appropriate use of a quantitative methodology adapted to the current working techniques are the main objectives of this scientific approach. In this respect, parameters were determined for obtaining the physical carrying capacity, then the resulting value was modified by the coefficients related to the correction factors. They also consider CAV_NDVI, a factor reflecting the abundance of vegetation and the value of the NDVI spectral index at pixel level, used to quantify the state of vegetation health, as a measure of the ecological status of the sites. The obtained results highlight the sensitivity of the algorithms used for the correction factors and the possibilities of converting these results into elements with practical possibilities for the sustainable sites management.

Volume XVI |

Conservation Status of Habitat Types of European Community Interest in the Alpine Biogeographic Region of Romania

Abstract: The Habitat Directive (HD) is the main strategy for nature conservation in the European Union aimed at stopping biodiversity loss. In this paper, we present the conservation status of those habitat types designated at the European level that occur within the Alpine biogeographic region (ALP) of Romania. The conservation status (CS) of habitats was assessed using data that were acquired as a result of the first national monitoring of species and habitats. This monitoring was completed during the 2007-2012 period following the mandatory requirements that arise from Article 17 of the HD to report the results to the European Commission in 2013. The ALP, which is one of the five terrestrial biogeographic regions that were demarcated within Romania on European criteria, comprises the Carpathian Mountains and covers an area of 46,800 km2. Following the official European methodology, all parameters were evaluated and combined to give the CS of each habitat type. The results show that, out of the 51 habitat types belonging to 6 classes that were identified of European Community importance within the Carpathian part of the ALP bio-region, only 17 habitat types occurred solely in the ALP bio-region. The conservation status of the habitat types was assessed as: ”Favourable” (FV) for eleven types (1 freshwater, 3 temperate heath and scrub, 4 natural and semi-natural grassland formations, 1 rocky habitat, and 2 forest habitats), ”Unfavourable inadequate” (U1) for four types (1 freshwater, 1 temperate heath and scrub, 1 Sphagnum acid bogs habitat, and 1 forest habitat), ”Unfavourable bad” (U2) for one (Sphagnum acid bogs type), and ”Unknown” (XX) for one (Calcareous fens habitat). These are results of the first national assessment in Romania of the CS of species and habitats protected by the HD and the first report to the European Commission.