Diurnal variations and vertical distribution of δ¹³C, and concentration of atmospheric and soil CO₂ in a meadow site, SE Poland

• Autorzy: Szaran J. , Dudziak A. , Trembaczowski A. , Niezgoda H. , Hałas S.
• Konferencja: Stable isotope records of environmental change. European Society for Isotope Research. VII Isotope Workshop, Graz 2004
• Języki publikacji: EN

Abstrakty

EN

We provide the results of 24-hour observations made in a meadow site located in a small river valley in Central Europe. Samples of atmospheric air were taken from three horizons: near the soil (0.05 m), in the grass (0.5 m) and above the meadow (2 m) at two-hour intervals. At the same time, samples of soil air were collected from two horizons: -0.1 and -0.5 m. We have found a variation of δ¹³C above the ground from -6‰ during the day to -20‰ late at night accompanied by variations in CO₂ concentration from 270 ppm during the day, to various levels late at night at different heights above the ground. The maximum concentration was 1430 ppm at the ground level. The correlation coefficient between δ¹³C and reciprocal of concentration was the highest (R2 = 0.984) for the samples collected 2 m above the ground, the regression line clearly indicating CO₂ mixing from the two sources: atmospheric and biogenic reservoirs. The intercept of the mixing line yields δ<sup<13</sup>C = -23.0‰ for the biogenic CO₂. In contrast, the diurnal variations in the soil were relatively small, δ¹³C varied from -21.6 to -23.4‰, while CO₂ concentration from 4300 to 8200 and from 24 700 to 34 500 ppm at depths of 0.1 m and 0.5 m respectively, which is less than 2-fold. Small diurnal variations are characteristic of dry soils, where δ^13C is weakly correlated with CO₂ concentration (in our case R2 was 0.30 and 0.54, respectively).

Słowa kluczowe

EN

SE Poland; atmospheric CO2; carbon dioxide concentration; diurnal observations; delta 13C; soil CO2

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2005
• Tom: Vol. 49, No. 2
• Strony: 135--144
• Opis fizyczny: Bibliogr. 45 poz., rys., tab., wykr.

Twórcy

autor

Szaran J.

• Institute of Physics, Maria Curie-Skłodowska University, Plac M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

autor

Dudziak A.

• Department of Physics, Lublin University of Technology, PL-20-618 Lublin, Poland

autor

Trembaczowski A.

• Institute of Physics, Maria Curie-Skłodowska University, Plac M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

autor

Niezgoda H.

• Institute of Physics, Maria Curie-Skłodowska University, Plac M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

autor

Hałas S.

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