模拟酸雨对黑麦草种子萌发及生理特性的影响

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

以一年生黑麦草(Annual Ryegrass Lolium multifolorum)种子为材料,研究不同pH值的模拟硫酸型酸雨作用下,种子的萌发及幼苗生理特性发生的变化。实验分别测定了种子发芽率、发芽势、发芽指数及幼苗鲜重、叶片导电率等指标。结果表明,一年生黑麦草种子的发芽势、发芽率、发芽指数整体变化趋势比较一致,随着模拟酸雨pH值的增大而减小。幼苗叶片的生长量变化差异比较大,单株幼苗的平均鲜重随模拟酸雨酸性的减弱而增大,所测幼苗叶片的相对电导率值随模拟酸雨pH值的升高而减小,与对照相比差异显著,表明幼苗叶片受到了酸雨的破坏。试验表明,一年生黑麦草种子在pH≥3.09的弱酸条件下能够正常萌发和生长,具有一定的耐酸性,但是在pH≤2.03的强酸条件下,种子的萌发和幼苗的生长受到了显著的抑制。

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）.