Carbon dioxide in the soils and adjacent caves of the Moravian Karst

Abstract

IzvlečekUDK 546.26:551.44(437.2) Jiří Faimon & Monika Ličbinská: Ogljikovi dioksid v prsti in jamah na Moravskem krasu Raziskovali smo spremembe koncentracije CO2 in drugi� spremenljivk, kot so temperatura, vlaga in prisotnost turistov v jama� Moravskega krasa (Republika Češka). Vse spremenljivke kažejo podobne letne trende in so med seboj korelirane. Do-Dokazali smo povezavo med koncentracijo CO2 ter temperaturo in vlago v prsti. Posamezne vplive zaradi multikolinearnosti nismo mogli izločiti. Vpliva vegetacije na produkcijo CO Vpliva vegetacije na produkcijo CO2 v prsti nismo zaznali. Prisotnost ljudi v jami se je izkazal za najpomembnejši prediktor vrednosti CO2. Druge spremenljivke, kot Druge spremenljivke, kot so CO2 v prsti in temperaturni gradienti so se izkazale za manj pomembne. Raziskovali smo tudi neprave povezave, pri čemer smo vzeli zunanjo temperaturo kot prediktor koncentracij CO2 v jama�. Ključne besede: ogljikov dioksid, jama, korelacija, regresijska analiza, prst, lažne povezave, Češka republika. Variations of soil/cave CO 2 concentrations and furt�er variables suc� as temperature, �umidity, and cave visitor attendance were studied in two sites of t�e Moravian Karst (Czec� Republic). All t�e variables s�owed t�e same seasonality; t�ey were strongly correlated wit� eac� ot�er. The dependence of soil CO 2 levels on soil air temperature and absolute �umidity was confirmed. Individual effects could not be distinguis�ed because of multicollinearity. The effect of vegetation on soil CO 2 production was not recognized. Cave attendance was identified as t�e most significant predictor of cave CO 2 levels. Ot�er variables, soil CO 2 and temperature gradients, were less significant. A spurious relations�ip was alternatively considered, in w�ic� external temperature was t�e universal predictor of cave CO 2 levels.

Carbon dioxide concentration in temperate climate caves and parent soils over an altitudinal gradient and its influence on speleothem growth and fabrics

“…In temperate climate settings soil and cave pCO 2 are usually positively correlated with surface temperature (cf. Ek and Gewelt, ; Bourges et al , ; Spötl et al , , Faimon and Ličbinská, ; Wong and Banner, ; Frisia et al , ). Thus a systematic study of soil CO 2 production and its controls on speleothem fabrics across an altitudinal/temperature gradient should provide a benchmark for understanding karst surface conditions during past climate changes such as glacial/inter‐glacial transitions and/or along a latitudinal gradient.…”

A case study of anthropogenic impact on the CO2 levels in low-volume profile of the Balcarka Cave (Moravian Karst, Czech Republic)

“…The instantaneous CO 2 concentrations in cave atmosphere are generally result of balancing the total CO 2 flux into cave with the flux out of cave (Faimon & Ličbinská 2010). The input flux includes (1) natural flux, connected mainly with a direct CO 2 flux from epikarst and with dripwater degassing (Holland et al 1964;Bourges et al 2001;Baldini et al 2008) and (2) anthropogenic flux (stemming from person exhaling in the caves open to visitors) (Faimon et al 2006;Lang et al 2015).…”

Variations of carbon dioxide in the air and dripwaters of Punkva Caves (Moravian Karst, Czech Republic)

“…Other studies indicate similarly high CO 2 concentrations (3-10 vol%) (Peyraube et al 2012(Peyraube et al , 2013Milanolo and Gabrovšek 2015). This is contradictory to low concentrations of soil CO 2 with seasonal character (Faimon and Ličbinská 2010;SanchezCañete et al 2011;Plestenjak et al 2012;Blecha and Faimon 2014a), although supported by some measurements in vadose zone and caves (Otava 1995;Benavente et al 2010). Independence of P CO 2 ðHÞ on surface conditions (temperature variation, rainfall, amount of water in perched collectors etc.)…”

“…The soil type is mull rendzic Leptosol (under deciduous trees) and gray rendzic Leptosol (under coniferous trees). The soil layer thickness varies from 30 to 80 cm (Faimon and Ličbinská 2010). The climate in Moravian Karst is moderate with the long-term mean annual temperature about 10°C with maxima in July/August and minima in January/February.…”

“…It is believed that most of the karst CO 2 is produced by biodegradation of organic matter or root respiration in soil/epikarst (Kuzyakov 2006). The CO 2 concentrations in karst soils usually reach up to 1 vol% (P CO 2 * 10 -2 ) with strong seasonal fluctuations leading to highest values in summer and lowest in winter (Faimon and Ličbinská 2010;Sanchez-Cañete et al 2011;Plestenjak et al 2012;Blecha and Faimon 2014a). Part of the soil CO 2 is dissolved in percolating water and transported downwards into lower parts of karst profile.…”