Search Results

You are looking at 1 - 2 of 2 items for

  • Author: Hana Pavlendová x
Clear All Modify Search
Open access

Svetlana Bičárová, Zuzana Sitková and Hana Pavlendová

Abstract

In this work, the response of temperate coniferous forests to ozone air pollution (O3) in the mountain environment of the High Tatra Mts. (Western Carpathians) was analyzed. The modelling of stomatal O3 flux is a complex method for the estimation of phytotoxicity of O3 pollution to forest vegetation. Stomatal flux-based critical levels (CLef) for effects of O3 on radial growth take into account the varying influences of O3 concentration, meteorological variables, soil properties, and phenology. The application of the model DO3SE (Deposition of Ozone for Stomatal Exchange) at five experimental plots with altitudes varying from 810 to 1,778 m a.s.l. along vertical and spatial profile in the High Tatra Mts. revealed the high phytotoxic potential of O3 on spruce forests during the growing season 2014. The accumulated stomatal O3 flux above a threshold of Y (1 nmol m−2 s−1), i.e. POD1 (Phytotoxic Ozone Dose) ranged from 13.6 mmol m−2 at the Kolové pleso site (1,570 m a.s.l.) to 16.2 mmol m−2 at Skalnaté Pleso site (1,778 m a.s.l.). CLef for POD1 (8 mmol m−2) recommended for the protection of spruce forests were exceeded at all experimental plots from early July. Similarly, AOT40 index suggests vulnerability of mountain forests to O3 pollution. AOT40 values increased with altitude and reached values varying from 6.2 ppm h in Stará Lesná (810 m a.s.l.) to 10.7 ppm h at Skalnaté Pleso close to the timber line (1,778 m a.s.l.). Concentration-based critical level (CLec) of 5,000 ppb h was exceeded from June to August and was different for each experimental site.

Open access

Danica Krupová, Věra Fadrhonsová, Hana Pavlendová, Pavel Pavlenda, Slávka Tóthová and Vít Šrámek

Abstract

Spatial and temporal variation of atmospheric depositions on the permanent monitoring plots of Level II of the ICP Forest programme in Czech and Slovak forest areas was described in this paper. The atmospheric bulk deposition of sulphur, ammonium and nitrate nitrogen from the years 2000–2016 were assessed and compared with the data obtained on European plots of this programme. The temporal developments of annual depositions in kg.ha−1.year−1 were determined by linear regression and displayed through maps. The most significant change during the reporting period was in the annual sulphur deposition, which was the statistically significant with rather sharp decrease on Slovak plots (P ≤ 0.01, R2 = 0.68) and with milder decrease in the Czech Republic (P ≤ 0.05, R2 = 0.23). There are small spatial and temporal differences in the deposition of the annual nitrate nitrogen depositions. The decrease was statistically more significant in Slovakia (P ≤ 0.01, R2 = 0.53) than in the Czech Republic (P ≤ 0.05, R2 = 0.30). The smallest changes were in annual depositions of ammonium nitrate, although the deposition was statistically significant in Slovakia (P ≤ 0.01, R2 = 0.42). In the Czech Republic dropped only slightly over the whole territory (except in the Beskydy Mts.) during evaluated period. The temporal variations of polluting components revealed significant differences between developments of depositions on the different plots of both republics. The sulphur and nitrogen depositions in the Slovak and Czech Republic persistently ranking among the highest in Europe, what is caused by local and transboundary anthropogenic emission.