Carbon Dioxide Control in an Open System that Measures Canopy Gas Exchanges

Carbon Dioxide Control in an Open System that Measures Canopy Gas Exchanges

Atmospheric carbon dioxide concentration ([CO2]) affects both C3 carbon net assimilation (A) as well as crop water use. Methods for measuring whole canopy gas exchange responses under [CO2] enrichment are needed for breeding programs aiming to develop crop cultivars resistant to stresses like drough...

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Veröffentlicht in:Agronomy journal 2014-05, Vol.106 (3), p.789-792
Hauptverfasser: Baker, Jeffrey T., Gitz, Dennis C., Payton, Paxton, Broughton, Katrina J., Bange, Michael P., Lascano, Robert J.
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Carbon dioxide
Gas exchange
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container_end_page 792
container_issue 3
container_start_page 789
container_title Agronomy journal
container_volume 106
creator Baker, Jeffrey T.
Gitz, Dennis C.
Payton, Paxton
Broughton, Katrina J.
Bange, Michael P.
Lascano, Robert J.
description Atmospheric carbon dioxide concentration ([CO2]) affects both C3 carbon net assimilation (A) as well as crop water use. Methods for measuring whole canopy gas exchange responses under [CO2] enrichment are needed for breeding programs aiming to develop crop cultivars resistant to stresses like drought in a future higher CO2 world. Previously we developed and tested a portable, open transparent chamber system for measuring canopy gas exchanges. Here we describe further development of this system by adding the capability of controlling [CO2]. Pure CO2 injection into the system was accomplished with a data logger operated mass flow controller attached to a high pressure CO2 gas cylinder. Across the full range of chamber air flow rates, [CO2] enrichment controls were within ± 12 µmol mol−1 of the desired set point. Following an abrupt user‐selected change in chamber air flow rate, [CO2] enrichment controls were re‐established within 3 to 5 min.
doi_str_mv 10.2134/agronj13.0450
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source Wiley Online Library Journals Frontfile Complete
subjects Carbon dioxide
Gas exchange
title Carbon Dioxide Control in an Open System that Measures Canopy Gas Exchanges
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