酸雨是指pH小于5．6的雨雪或其他形式的大气降水,是大气污染的一种表现。因为最早引起人们注意的是酸性降雨,所以习惯上就称酸雨。酸雨对生态系统影响面极大,它会使土壤融化,养分淋溶,肥力降低,植被破坏,树木枯萎一;酸雨还使地表水和地下水酸化,影响鱼类及水生生物的生 Acid rain refers to rain or snow with pH less than 5.6 or other forms of atmospheric precipitation, which is a manifestation of atmospheric pollution. Because it was the acid rain that caught the earliest attention, it was customarily called acid rain. Acid rain has a great impact on the ecosystem. It will melt the soil, leaching nutrients, reduce fertility, destroy vegetation, and cause the trees to wither; acid rain also acidifies surface water and groundwater, affecting the health of fish and aquatic life.