摘要：The influence of flow turbulence on the growth of Chara fibrosa was studied for 12 weeks under laboratory conditions using a mechanically oscillating grid that generated turbulence without net flow. The experimental turbulence velocities were 1.93 ± 0.48 cm s −1 (high turbulence), 1.06 ± 0.41 cm s −1 (medium turbulence), and 0.46 ± 0.15 cm s −1 (low turbulence), while the control was a no turbulence condition. Plants exposed to high and medium turbulence showed shoot elongation rates less than 50% of the control throughout the experiment period. Ascorbate peroxidase activity and catalase activity were elevated, and reductions of total chlorophyll content and photosynthetic efficiency were observed in the plants exposed to turbulence. Carbon content of the plant tissue was decreased in the high and medium turbulence treatments; in contrast, it was slightly increased in the treatment of low turbulence. Exposure to turbulence adversely affected growth of C. fibrosa, though all the plants survived the experiment period.
