Analysis of precipitation year and their regional frequency distributions in the Danube-Tisza mid-region, Hungary

Kun, A. (2001) Analysis of precipitation year and their regional frequency distributions in the Danube-Tisza mid-region, Hungary. Acta Botanica Hungarica, 43 (1-2). pp. 175-187. ISSN 0236-6495

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Abstract

The precipitation distribution of the Hungarian part of the Danube-Tisz Mid-Region (the centre of the Great Hungarian Plain) is discussed based on 70 years of mounthly data from eleven meteorlogical stations. The vegetation of the region belongs to the southeast Central-European forest-steppe zone. Besides the edaphic conditions, the vegetation is primarily constrained by the amount and seasonal distribution of pericipitation. Pericipitation years-types defined by the annual sums and the seasonal distribution of pericipitation including the time of maximum and minimum and minimum amounts within year were usedto compare the climate of the stations. Great differences were found between the northern and southern part of the region in the frequencydistributions of precipitation year types. Years with high amount of precipitation were more frequent at the northern park of the region, whileyears with low amount with low summer precipitation is also increased from north to south.             Within this overall north to south gradient, two parallel gradients were distinguished in the western and the eastern part of the region. Along the western gradient, years with higher annual and summer precipitation had a higher frequency compared to the eastern gradient. Along both gradients, however, both annual and summer precipitation decreased towards the central part of the region.             The two gradients revealed by the precipitation years correspond with chorological-floristical and coenological gradients detected by other studies in the region. Thus, our results may provide an explanation for these changes in the flora and the vegetation of the Danube-Tisza Mid-Region.

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