Effects of simulated acid rain on Growth of Lolium perenne

Abstract

Lolium perenne is an important forage in China. In order to reduce the effect of acid rain on the quality and yield of Lolium perenne, Lolium perenne was used as material to study the changes of seedling growth and physiological characteristics under different pH conditions. The results showed that under the influence of simulated acid rain, the biomass and chlorophyll content of ryegrass changed greatly. The aboveground biomass and total biomass increased at pH 4.0 ~7.0, and the aboveground biomass and total biomass were the largest at pH 5.0, indicating that moderate acidity promoted the growth of Lolium perenne leaves. The chlorophyll content showed a double peak curve with the change of acid rain acidity, and reached the peak value at pH = 7 and pH = 3.5, respectively, indicating that acid environment was also conducive to the synthesis of chlorophyll in Lolium perenne leaves. Malondialdehyde content and relative conductivity increased significantly with the aggravation of acid rain stress, which was also a kind of adaptation and response mechanism of plants to environmental stress.