Acta Univ. Agric. Silvic. Mendelianae Brun. 2018, 66, 1111-1118
Published online 2018-10-29

Evaluation of Aridity Index in the Czech Republic within 1961–2015

Lenka Hájková1, Lenka Bartošová2,3, Věra Kožnarová4

1Czech Hydrometeorological Institute, Department of Biometeorological Applications, Na Sabatce 17, Praha, Czech Republic
2Global Change Research Institute CAS, Belidla 986/4a, Brno, Czech Republic
3Mendel University, Faculty of AgriSciences, Department of Agrosystems and Bioclimatology, Zemedelska 1, Brno, Czech Republic
4Czech University of Life Sciences, Faculty of Agrobiology, Food and Natural Resources, Kamycka 129, Praha, Czech Republic

Drought (similarly as flooding) is considerably the gravest agrometeorological extreme connected with climate change and bringing the highest losses in an agricultural production. The objective of this paper is to study the spatial and temporal variability of the Aridity Index (AI) in the Czech Republic, per decade, during the 55‑year period (1961–2015). AI is a climatic index, which is important for recording of the drought phenomenon evolution. The climatic data used, include monthly precipitation totals and air temperature from 120 meteorological stations operated by the Czech Hydrometeorological Institute. The potential evapotranspiration was calculated based on the modified algorithm Penman‑Monteith. The data processing was done by the statistical tools of Microsoft Excel and the Geographical Information Systems (Clidata GIS, ArcGIS 10). The results of the analysis showed, that during the decade 1961–1970, almost the whole area of the Czech Republic is classified as “wet” with AI values ranging above 0.60, but over the next years (1971–2015), areas of the south Moravia (e.g. Dyjsko‑svratecký ravine, Valticko‑lednický area, surroundings of Brno city), and also Prague city and Poohří river basin shifted gradually to “sub‑humid” climate zone with AI < = 0.60. Especially, during the pre‑last decade of the study period 1991–2000.


This work was supported by the Ministry of Education, Youth and Sports of CR within the National Sustainability Program I (NPU I), grant number LO1415 and by the projects funded by National Agency for Agricultural Research “Crop modelling as a tool for increasing the production potential and food security of the Czech Republic under Climate Change“ (QJ1310123).


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