Abstract
1. The C 3 annuals, Avena sativa and Brassica kaber, and C 3 and C 4 perennials, Prosopis glandulosa and Schizachyrium scoparium, respectively, were grown in a 38-m long chamber along a continuous gradient of daytime CO 2 concentrations ([CO 2 ]) from near the current 350 μmol mol −1 to 150 (annuals) or 200 μmol mol −1 (perennials). Diurnal CO 2 and water fluxes were calculated for plant stands in five consecutive, 7.6-m lengths of the chamber arranged linearly along the [CO 2 ] gradient
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