Diurnal Oscillations of Gas Production and Effluxes (CO2 and CH4) in Cores from a Peat Bog
| Autor: | J. Benstead, David D. Lloyd, Siôn S.H. Lloyd, Katie L. Thomas |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Biological Rhythm Research. 29:247-259 |
| ISSN: | 1744-4179 0929-1016 |
| DOI: | 10.1076/brhm.29.3.247.1442 |
| Popis: | Peat cores (15 cm diam X 30 cm deep) from Ellergower Moss, New Galloway, Scotland were kept and monitored at constant temperature (10 ± 0.1oC) for gas production using a 1.6 mm diam stainless steel probe fitted with a membrane inlet and connected to a quadrupole mass spectrometer. In the headspace, O2, CO2 and CH4 (measured at m/z values 32, 44 and 15 respectively) showed diurnal fluctuations in low-intensity natural daylight and under a light-dark (LD, 12:12) regime. Over the first few cycles O2 and CO2 increased together in the dark and decreased in the light, whereas CH4 showed variations in antiphase with the other two gases. CO2 and CH4 also showed diurnal oscillations at 15 cm depth, but these decreased together in the light whereas argon (m/z = 40) was not varying. A highly-damped free-run of the oscillations in gas concentrations at 15cm depth was evident for only 3 cycles in complete darkness and at constant temperature. This might suggest desynchronization between individual plants with differen... |
| Databáze: | OpenAIRE |
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