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The impact of covid-19 restrictions on carbonaceous aerosols at rural background site: importance of vertical distribution
Mbengue, Saliou ; Vodička, Petr ; Komínková, Kateřina ; Schwarz, Jaroslav ; Zíková, Naděžda ; Prokeš, Roman ; Suchánková, Lenka ; Julaha, Kajal ; Ondráček, Jakub ; Holoubek, Ivan ; Ždímal, Vladimír
In this study, EC and OC at 4 m elevation and EC at 230 m elevation showed a similar \nseasonal pattern with higher values in winter and lower values in summer. OC, measured \nat 230 m height showed an opposite behavior with slightly higher values in spring and \nsummer, probably related to the increased contribution of secondary organic carbon \n(SOC). Concentrations were generally higher at 4 m, where there was also a better \ncorrelation between EC and OC, suggesting a greater influence of local sources near the \nsurface.
Plný tet:  PDF
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Vertical Collembola distribution in spruce and beech forest soils
Jínová, Kristýna
Vertical stratification of Collembola was investigated in beech and spruce forest soils on the Kleť Mountain (Blanský les Protected Landscape Area, South Bohemia, Czech Republic). The aim of the study was to describe the collembolan distribution among the horizons in the present beech and spruce forest soils and to find out which species were dominant in the individual soil layers. Ten soil samples (each of 10 cm.sup.2./sup., 15 cm deep) were collected in beech and spruce forest on the Kleť Mt. in December 2004. They were divided into 5 sub-samples: litter + 0-1 cm of soil; 1-2, 2-5, 5-10, and 10-15 cm and extracted separately in high-gradient Tullgren apparatus. In total, 40 species were found at both sites (31 in the beech and 28 in the spruce forest). The highest number of species was found in the upper layer (litter layer + 0-1 cm) of soil, 84 % of species in the beech forest and 64 % in the spruce forest.
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Species composition along the vertical gradietn in canyon-shaped reservoirs
Prchalová, Marie ; Kubečka, Jan
During years 2004 and 2005, vertical gradients of fish distribution within two canyon-shaped Czech water supply reservoirs (Římov, Švihov) were examined by Nordic multimesh gillnets in both pelagic and benthic habitats. In the open water, most fish were found in the upper 5 m of depth. Below this depth nearly no fish occurred. The community was represented mainly by bleak. Towards deeper parts the portion of perch increased. In benthic areas, most fish were in the upper 3 m of depth. Abundance declined to 10 m and below this depth nearly no fish were present. Perch and roach dominated the littoral community. Ruffe preferred the deeper habitats. With respect to biomanipulative removal catches, it is sufficient to fish in the upper 5 m of the open water and in the upper 3 m in the littoral of the reservoir. For getting a rough but adequate assessment of fish community, it is satisfactory to sample the upper 5 m of the open water and the upper 10 m in the benthic part of the reservoir.
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