Measurement of soil respiration and its isotope signature using an automated closed-chamber system

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dc.contributor.advisor Kirk, Guy
dc.contributor.advisor Pawlett, Mark Downie, Matthew 2015-06-11T09:39:40Z 2015-06-11T09:39:40Z 2014-06
dc.description.abstract A variety of methods is currently used for measuring soil and plant respiration and its isotope composition. Limitations found in the literature show a lack of a single set of specifications for these measurements. This report details a unique laboratory at Cranfield University (the Wolfson Field Laboratory - WFL) containing automated gas flux chambers attached to planted soil lysimeters and capable of providing near continuous measurements of gas fluxes and their isotope composition. The research in this thesis was concerned with the ability of the WFL to measure CO2 gas fluxes from plants and soil and their isotope composition. A specification for closed chamber methods was developed, the validity of these specifications tested, and the ability of the WFL to meet these specifications determined. The methods developed include a means of assessing the effects of gas loss processes both on the measured CO2 concentration and the measured isotopic signature within a defined volume. Measurements of plant and soil CO2 efflux in the WFL lysimeters and its isotope composition were used to infer the isotope signature of plant and soil respiration using Keeling plots. The results showed the specifications developed were valid although further work is required to determine the ability of the WFL to meet the isotope measurement specifications. en_UK
dc.language.iso en en_UK
dc.publisher Cranfield University en_UK
dc.rights © Cranfield University 2014. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright owner. en_UK
dc.subject Specifications en_UK
dc.subject diffusion modelling en_UK
dc.subject Keeling plots en_UK
dc.subject diurnal variation en_UK
dc.subject CO2 analysis en_UK
dc.title Measurement of soil respiration and its isotope signature using an automated closed-chamber system en_UK
dc.type Thesis or dissertation en_UK
dc.type.qualificationlevel Masters en_UK
dc.type.qualificationname MSc by Research en_UK

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