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ARS Home Plains Area Bushland, Texas Conservation and Production Research Laboratory Soil and Water Management Research Research Publications at this Location





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Title:   Author  item
                                            Baker, Jeffreyitem
                                            Gitz, Dennisitem
                                            Payton, Paxtonitem
                                            BROUGHTON, KATRINA - Commonwealth Scientific And Industrial Research Organisation (CSIRO)item
                                            BANG, MICHAEL - Commonwealth Scientific And Industrial Research Organisation (CSIRO)item
                                            Lascano, Robert
  Submitted to: Agronomy Journal
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 1/15/2014
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: Atmospheric carbon dioxide concentration affects both C3 carbon net assimilation as well as crop water use. Methods for measuring whole canopy gas exchange responses under carbon dioxide enrichment are needed for breeding programs aiming to develop crop cultivars resistant to stresses like drought in a future higher carbon dioxide 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 carbon dioxide concentration. Pure carbon dioxide injection into the system was accomplished with a data logger operated mass flow controller attached to a high pressure carbon dioxide gas cylinder. Across the full range of chamber air flow rates, carbon dioxide concentration enrichment controls were within ± 12 μmol per mol of the desired set point. Following an abrupt user-selected change in chamber air flow rate, carbon dioxide concentration enrichment controls were re-established within 3 to 5 min.


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