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Traditional farming has been ceased in large areas regarding several Central-European countries during the last decades. Nevertheless, only minimal knowledge is available about the impacts of these land use changes on the fluxes of grasslands. Within the framework of this research the dependence of stand level CO2 flux (NEE) on temperature, light (PPFD), leaf area (LAI), evapotranspiration and soil moisture has been examined in a dry sandy pasture grazed by grey cattle for decades. The examinations have been completed both in a grazed area and in a 6 hectare patch excluded from grazing. Measurements have been taken for 3 years during the vegetation periods in the area of the Kiskunság National Park by a mobile Plexiglas chamber as well as infrared gas analysers. Among the examined abiotic and biotic parameters the dependence of NEE on PPFD and LAI has been significant in both areas. Exponential and linear correlation turned out to be the strongest in both grassland types between CO2 fixation and light dependence and CO2 fixation and leaf area, respectively. The strongest correlation has been observed between the PPFD and NEE in both types of grassland. The dependence of CO2 flux on light and leaf area has been stronger in the extensively grazed area compared to the other examined grass excluded from grazing. Based on this fact it can be assumed that the conversion of land use in traditionally grazed grasslands has negative influence on the relation among NEE and the key abiotic and biotic parameters. It can be explained, beside the accumulation of litter, by the altered vegetation dynamic processes. Extreme dry periods effect, in a negative way, the dependence of CO2 flux on temperature, soil moisture and evapotranspiration. It calls the attention to the impacts of weather extremities on the mechanisms in seminatural sandy grasslands.

DEPENDENCE OF CO2 FLUX ON THE KEY ABIOTIC AND BIOTIC PARAMETERS IN SEMI-NATURAL GRASSLANDS EITHER TRADITIONALLY GRAZED OR EXCLUDED FROM GRAZING