Measuring the (13)C content of soil-respired CO(2) using a novel open chamber system.

Measuring the (13)C content of soil-respired CO(2) using a novel open chamber system. Research Abstract Details 

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Measuring the (13)C content of soil-respired CO(2) using a novel open chamber system. Abstract Text:

Carbon dioxide respired by soils comes from both autotrophic and heterotrophic respiration. (13)C has proved useful in differentiating between these two sources, but requires the collection and analysis of CO(2) efflux from the soil. We have developed a novel, open chamber system which allows for the accurate and precise quantification of the delta(13)C of soil-respired CO(2). The chamber was tested using online analyses, by configuring a GasBench II and continuous flow isotope ratio mass spectrometer, to measure the delta(13)C of the chamber air every 120 s. CO(2) of known delta(13)C value was passed through a column of sand and, using the chamber, the CO(2) concentration stabilized rapidly, but 60 min was required before the delta(13)C value was stable and identical to the cylinder gas (-33.3 per thousand). Changing the chamber CO(2) concentration between 200 and 900 micromol.mol(-1) did not affect the measured delta(13)C of the efflux. Measuring the delta(13)C of the CO(2) efflux from soil cores in the laboratory gave a spread of +/-2 per thousand, attributed to heterogeneity in the soil organic matter and roots. Lateral air movement through dry sand led to a change in the delta(13)C of the surface efflux of up to 8 per thousand. The chamber was used to measure small transient changes (+/-2 per thousand) in the delta(13)C of soil-respired CO(2) from a peaty podzol after gradual heating from 12 to 35 degrees C over 12 h. Finally, soil-respired CO(2) was partitioned in a labelling study and the contribution of autotrophic and heterotrophic respiration to the total efflux determined. Potential applications for the chamber in the study of soil respiration are discussed. Copyright (c) 2008 John Wiley & Sons, Ltd.

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Measuring the (13)C content of soil-respired CO(2) using a novel open chamber system. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Rapid communications in mass spectrometry : RCM

VOLUME: 22

Page Numbers: 2073-81

Journal Abbreviation: Rapid Commun. Mass Spectrom.

ISSN: 0951-4198

DAY: 16

MONTH: Jul

YEAR: 2008

Measuring the (13)C content of soil-respired CO(2) using a novel open chamber system. Information

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LANGUAGE: eng

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AFFILIATION: The Macaulay Institute, Craigiebuckler, Aberdeen AB15 8QH, UK.

Country: England

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MEDLINETA: Rapid Commun Mass Spectrom

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