Modelling net photosynthetic rate of temperate dry grassland species and winter wheat at elevated air CO2 concentration

Abstract

A number of C3 temperate dry grassland species and winter wheat plants were grown in open top chambers either at 365 μmol mol-1 (AC) or at 700 μmol mol-1 (EC) air CO2 concentrations. Gas exchange measurements were made at several air CO2 concentrations. When measured at higher CO2 concentrations, net photosynthetic rate was higher in plants grown at EC than at AC. The widely accepted Farquhar net photosynthesis model was parameterized and tested using several observed data. After parameterization the test results corresponded satisfactorily with observed values under several environmental conditions. © 2006, Penkala Bt.