The type and temporal variability of precipitation, the forest vegetation and soils affect the process of water infiltration into the karst aquifer. Changes in age, the variety and spatial structure of forests have diverse effects on forest hydrology. It is proven that climate change has impacts on precipitation regimes and evapotranspiration, future forecasts predict more frequent weather and hydrological extremes. Karst critical zone is a complex system of dynamic hydrological processes and unique characteristics of water percolation. We have analysed the data measurements of throughfall precipitation in the forest stands of different age classes and the underlaying Postojna-Planina cave system. We have measured the leaf area index to determine the effect of a vegetative period on the interception of precipitation. The throughfall measurements, measurements of soil water content and water percolation, temperature and electrical conductivity of water showed differing time lags of the water infiltration of chosen precipitation events, depicted on charts.
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