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  • Author: Margita Dubová x
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Abstract

We present data on sodium amounts reaching the forest soil surface at the Beech Ecological Experimental Site Kremnické vrchy Mts (Western Carpathians). Sodium concentration and deposition were determined in precipitation and throughfall sampled from study plots. The mean annual sodium concentrations obtained on the two plots (CC - clear cut, C - control) were 0.16 (CC ) and 0.19 mg l−1 (C). The values were the lowest among the base cations in precipitation. The trends in spring and annual concentrations were similar, in the 10th year after the intervention, identical. The possible cause is interception of precipitation in the stand and the ions tendency to absorb by beech leaf tissues. This may cause interception of precipitation in the stand and the tendency of beech leaf tissue to absorb sodium ions. Also, the mechanism driving the ion exchange between K+ and Na+ may cause lower sodium content in throughfall. On both plots, the sodium concentration in spring was somewhat higher than in other seasons of the other year: 0.04-0.42 (CC ) and 0.07-0.76 mg l−1 (C). The trends of spring sodium concentration and deposition on C were decreasing. Plot CC in spring was the only case showing an increasing trend. The spring trends evidently reflected the fact that 10-12 years after the cutting intervention, natural regeneration and growth of beech stand occurred on both the plots. Moreover, the mean winter and summer sodium deposition on both plots was low (0.02 kg), showing a decreasing trend. The autumnal deposition was 0.5 kg (CC ) and 0.3 kg ha−1 (C). The total annual sodium amount reaching the forest soil surface was lower on C (0.9 kg) than on CC (1.2 kg ha−1 year−1). The crown impact coefficient (CIC),the deposition ratio between the plots C:CC , values were 0.6 (spring, autumn), 1.0 (winter, summer) and 0.8 (year). There was no manifested presence of sodium sources of either natural or anthropogenic origin. All the obtained values are low and may be considered as background. They indicate that the Beech Experimental Ecological Site is ecologically clean.

Abstract

This paper examines results of the sulphate sulphur content and its concentration in soil water from the beech forests situated in the Štiavnicke vrchy Mts in Slovakia. The S-SO4 2- content in bulk precipitation, throughfall and soil water for 1989-2007 was studied in these beech stands and open plots. The highest SO4 2- values were found in the forest stand plot at 0.25 m depth (42.03 mg.l-1 in 1988), and the average sulphate sulphur content in soil water increased with soil depth; from 20.2 kg.ha-1.yr-1 at the surface to 28.5 kg.ha-1.yr-1 at 0.25m depth. The mean S-SO42- concentration was 20.7 mg.l-1 in the surface humus and 30.84 mg.l-1 at 0.25m. There was an imput of 538.5 kg S-SO4 2-.ha-1 to the soil during the study period. Regression analysis revealed a statistically significant influence of sulphur content in the atmospheric deposition on the sulphur content in the soil water. A significant correlation between the precipitation amount and the content of sulphur in precipitation and in soil water was observed. The Student‘s t-test for dependent variables confirmed statistically significant differences between the sulphur content in soil water at 0.10 m and 0.25 m depths in these study areas. Finally, no significant differences were detected at the same plot in different study years