Impact of Short-Term Elevated CO_2 on Absorption of carbonyl compounds by Schefflera Octophylla and Chamaedorea Elegans

摘要

The absorption characteristics of formaldehyde, acetaldehyde, propionaldehyde, n-butyraldehyde and valeraldehyde by Schefflera octophylla and Chamaedorea elegans were investigated at the laboratory simulation environment of short-term exposure to different CO_2 concentrations. Under normal circumstances, the C_1-C_5 aldehyde removal rates of Schefflera octophylla and Chamaedorea elegans were ranged from 0.311μmol/m~2/h for valeraldehyde to 0.677 μmol/m~2/h for formaldehyde, and 0.526 μmol/m~2/h for propionaldehyde to 1.440 μmol/m~2/h for formaldehyde, respectively. The CO_2 experiments showed that the total aldehydes removal rates of Schefflera octophylla and Chamaedorea elegans decreased 32.0% and 43.2%, respectively, with the increasing of CO_2 experiments from 350ppmv to 1400ppmv. This might be explaned by that high CO_2 concentrations can induce stomatal closure, which as an responce for plants facing environmental changes, and consequently impacts on the abilities of absorbing air pollutants.