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• Examination of the heavy metal uptake of carrot (daucus carota) in different soil types

  56-70

  György Szabó

  Krisztina Czellér

  Views:

  120

  In this paper the heavy metal uptake of carrot (Daucus carota) is studied in sample areas with different soil types. Our aim is to examine how the different soil types possessing different characteristics affect the heavy metal uptake and distribution in the plant. Correlation analyses were carried out in order to determine which of the total heavy metal concentrations and soil characteristics (pH, CaCO3-content, humus content, granulometric composition) play the most important role in the uptake of the Co, Cu, Fe, Ni, Mn, Zn and in the metal distribution in the examined plant. Soil and plant samples were collected from 5 different Hungarian areas in July, 2008. In the cases of soils with different soil characteristics, the examined plants are supposed to give varied physiological responses. During the examination we proved that the genetic type and the heavy metal content of the soil do not significantly affect the heavy metal uptake of carrot. The granulometric composition of the soil has the most considerable effect but this factor only affects the rate of the metal uptake in 50% of the examined heavy metals (Ni, Mn, Zn).

• Regional Development in the Age of Big Data

  1-9

  József Jankó

  György Szabó

  Views:

  163

  Our paper presents a forward looking analytical approach to the territorial development in a region of the Transylvanian Plain situated in the vicinity of Cluj-Napoca, Romania. We outlined the development of this region with the means of landscape architecture supported by a comparable assessment. In the age of Big Data we settled at creative usage of traditional analysis. We extracted yet undetected information from a limited amount of available as yet loosely related data. The key feature of the employed model is the ontological traceability of cause and effect. Although technology is available to collect enormous data, expert knowledge gained by education and professional practice cannot be overlooked. We demonstrate that this method of location based analysis is capable of delivering value added to established principles of spatial planning in the age of trustworthy, large volume, heterogeneous data.

• Long-term analysis of River Tisza water level data with regard to the ecological water demand of floodplain water bodies

  16-32

  György Dévai

  Martina Gyöngy

  Csaba Berta

  Ferenc Bogár

  Imre Bogár

  György Varga

  Lucza Zoltán

  László József Szabó

  Imre Somlyai

  Sándor Alex Nagy

  István Grigorszky

  Views:

  281

  One of the main threats of our time is the increasing water demand not only globally, but also locally. These are often met at the expense of ecological water demand, jeopardizing the structural and operational conditions necessary to maintain good ecological status in aquatic and wetland habitats. This is why it is of great importance to explore possible water retention options. In 2019, based on the long-term data series on the water level of River Tisza, we studied the frequency and extent of flooding in the floodplain between Tiszabercel and Gávavencsellő, where there are valuable wetlands, including a ‘sanctuary’-type backwater. This was necessary because recently the floodplains have undergone negative changes. Their water volume has gradually decreased, their valuable wildlife has become rarer, some of them have completely dried out in the autumn and even one of them has burned out. From the analysis of the examined 48-years data, it could be concluded that flooding was relatively frequent in the sampled area, but the extent of water coverage had no significant effect either in space or time. It was also found that only water levels above 700 cm (based on the water meter of Tiszabercel, 98.36 mBf) could adequately ensure that the water bodies are filled up and flushed out. However, there is little chance of this, because of four reasons: (1) water levels of this height are becoming rare; (2) the duration and height of high water levels are mostly short in time; (3) water levels of several water bodies are artificially decreased; (4) the drainage effect of the River Tisza – which has been significantly incised after the river regulation – prevails in the area. Due to all, in the future, there would be a great need to maintain the water levels in the floodplain wetlands as efficiently as possible after the floods – for which we have made specific proposals for the places and methods to preserve the ecologically necessary amount of water.

• Evaluation of climatic conditions from 1978 to 2020 of Oued Souf valley (Southern East of Algeria)

  1-10

  Ayoub Barkat

  Foued Bouaicha

  Zakaria Rahal

  Tamás Mester

  György Szabó

  Views:

  98

  In this research, a climatic synthesis was built to assess the climatic parameters of the Oued Souf Valley through the meteorological data obtained from Guemar station (airport). It was revealed that the hydrological year of Oued Souf Valley is branded by the presence of a dry period and the total absence of a wet period over the year, even during January, when it was observed to have the lowest temperature and highest precipitation, which classified it as a Saharan climate (Hyper arid). The irregularity and the scarcity of precipitation, high temperatures and extremely high evapotranspiration had significant repercussions on surface runoff and infiltration which implies a high pressure on the water resources of Oued Souf valley and may disrupt the future socioeconomic project and increase the damage of natural drought and desertification.