A Fast, Low Cost and Low Power Requiring Device for Improving Closed Loop CO2Measuring Systems

An improved and fast version of a closed loop system for measuring net CO2 exchange rates (NCER) in the field using a portable infrared gas analyser (IRGA) is described. An electronic timer—differentiator device measures and displays very accurately the time period necessary to bridge over a constan...

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Bibliographic Details
Published in:Journal of experimental botany 1986-08, Vol.37 (181), p.1234-1244
Main Authors: CEULEMANS, R., KOCKELBERGH, F., IMPENS, I.
Format: Article
Language:English
Subjects:
Carbon dioxide
Closed loop systems
Closed systems
Flux density
Photons
Photosynthesis
Plants
Pumps
Sugar beets
Timing devices
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Summary:An improved and fast version of a closed loop system for measuring net CO2 exchange rates (NCER) in the field using a portable infrared gas analyser (IRGA) is described. An electronic timer—differentiator device measures and displays very accurately the time period necessary to bridge over a constant and preselected CO2 concentration difference. The time required for each measurement from start of the measurement to display of final results is c. 9 s for NCER of 24 μmol m—2 s—1. The measurement interval is sufficiently short that no environmental control in the perspex mini-cuvette is needed. Some satisfactory data of NCER measurements obtained under field and glasshouse conditions on poplar, sugar beet and winter wheat are presented.
ISSN:0022-0957
1460-2431