Effects of Simulated Acid Rain on Seed Germination and Seedling Physiological Characteristics of Annual Ryegrass Lolium Multifolorum

Using Annual Ryegrass Lolium multifolorum seed as material to study the effect of different pH simulated acid rain on the seed germination and seedling physiological characteristics.The experiment tested the germination power,germination rate,germination index,seedling fresh weight and permeability of plasma membrane etc indexes.The results indicated that the germination power,germination rate and germination indexes all decreased with the simulated acid rain density increasing.There were great changes among the indexes of seedling growth increment: seedling fresh weight increased with simulated acid rain pH rising.And permeability of plasma membrane decreased with the acid rain pH increasing,which showed that seedling leaves were destroyed by the acid rain.The study indicated that the seed of nnual Ryegrass Lolium multifolorum could sprout and grow normally under the condition of weak acid(pH≥3.09),and had certain acidtolerance.But seed germination and seedling growth were seriously restrained under the condition of strong acid(pH≤2.03).