Isoecological curves on characterising the ecotypes central Mecsaek MTS of Hungary

Ecological indicator values, widely used botany, are empricial scales worked out for the most important factors. Values of enviromental factors determine the position of the vegetation units in a multidimensional abstarct space. Their latest version in Hungary is the catergory system of Borhidi (1995), which is adjusted ti the European systems (e. g. Ellenberg et al. 1992). Indicator values or categories, respectively, can be found, according to European practice, in a relational computerised database (Horváth et al. 1995) which is accpeted as a standard for the botanists. An example of isoline analysis, completed using ecological indicator values of vegetation samples, is presented on a modell area in Mecsek Mts of South Hungary. It has varied vegetation with diverse kind of human interference near Pécs. From the existing indicator values applied here temperatur (TB), water demand (WB) of plants and soil reaction (RB). Each single isocurve was constructed from the similar indicator values on a computerised way (Surfer 6.1). All the curves were made by the use of avarages, single values and certain groups of ecological indicator values. Only the figures amde by the avarages are presented here, because there is no additional unformation in the case of the use of single curves. Curves of temperature and water indicators (isoTB, isoWB) show climatic conditions changed by human impact. Curves of soil reaction (isoR) show in a given moment the actual vegetation, in time dimension that parts of enviroment wich are more sensitive to acidification. Analysing isoecological curves, human impact is easily recognisable (e.g. in surroundings of clear-cuttings, etc.). On the basis of our results added to monitoring system enviromental impacts of future industrial and forestry establishments can be modelled. Isolines, using above-mentioned indicator values help to reveal and quantify enviromental change, which is model-valued posibility for preparing enviromental impact studies and making quick decisions.