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Measurements and the use of spectral reflectance of solar radiation from surface water levels
Vinciková, H. ; Pechar, L. ; Hanuš, Jan
The methodology describes measurement of spectral reflectance from the surface of water bodies and application of the measured reflectance in assessment and monitoring of water quality especially in terms of the range of eutrophication and development of water blooms. The aim of the suggested methodology is to provide an effective tool for a rapid screening of water quality situation in the Czech Republic, including relatively large areas, and therefore from more water bodies at once. This method using remote sensing allows to gather lot of data on water quality without time-consuming and overall more expensive field sampling and laboratory analysis.
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Atmospheric factors influencing net ecosystem production of Norway spruce forest in Beskydy Mountains
Taufarová, Klára ; Havránková, Kateřina ; Czerný, Radek ; Janouš, Dalibor
Daily net ecosystem production values of Norway spruce forest at Experimental Ecological Research Site Bílý Kříž in Beskydy Mountains were estimated using eddy covariance technique. Norway spruce forest uptakes CO2 from the atmosphere during production season. During production seasons 2005-2007 mean daily net ecosystem production was 22 kg C ha-1, and mean production season duration was 240 days. During production seasons there occurred days with respiration higher than assimilation, thus the forest was source of the atmospheric carbon. There were 45, 68 and 39 days in production seasons 2005, 2006 and 2007, respectively, when the forest was carbon source. It was caused by 1) significant decrease of air temperature and low intensity of PAR at the beginning and end of production seasons; 2) low radiation in overcast days and 3) long dry period with high intensity of direct radiation and high air temperature during production seasons.
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Seasonal course of CO2 efflux in grassland and forest ecosystem in Beskydy mts
Dařenová, Eva ; Pavelka, Marian ; Acosta, Manuel ; Janouš, Dalibor
Our aim was to determine seasonal changes of CO2 efflux of the grassland and of the soil and stems in the Spruce forest at Bílý Kříž (Beskydy Mts). For elimination of the temperature dependency of CO2 efflux, standardized CO2 efflux R10 is used. Mean R10 was about 2.50, 5.0 and 0.97 umolCO2 m-2 s-1 for grassland, forest soil and stems. In grassland the R10 course did not show obvious trend. Whereas in the forest soil, the significant increase in R10 at the beginning and decrease at the end of the season occurred, but without any distinct maximum. Similar increase and decrease in R10 was observed in the stem CO2 efflux course as well. But there was a maximum in June and July. The temperature CO2 efflux sensitivity (Q10) was 3.04, 1.90 and 2.25 for the grassland, forest soil and stems. The temperature sensitivity in the forest soil increased shortly after rain. It resulted in a rapid increase in CO2 efflux of the soil as a response to rain.
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