论文部分内容阅读
一、引言近几十年来,酸雨对陆地和水体的潜在影响已日益引起人们的关注。欧洲和北美地区酸雨对地表水化学及淡水中生物群的不利影响已被认为是一个主要的环境问题,而且,酸雨导致的土壤酸化可能在西欧的森林林冠枯萎中起了关键作用。迄今为止,酸雨在土壤酸化中的相对重复性在文献中还有争论。有的作者认为,酸雨对欧美土壤酸化的贡献与自然因素和耕作的影响相比是很小的,而其他人却提出相反的看法。
I. INTRODUCTION The potential impact of acid rain on land and water has drawn increasing attention in recent decades. The negative effects of acid rain on surface water chemistry and freshwater biota in Europe and North America have been identified as a major environmental issue and acid rain-induced soil acidification may play a key role in the canopy decay in Western Europe. To date, the relative reproducibility of acid rain in soil acidification has been debated in the literature. Some authors believe that the contribution of acid rain to soil acidification in Europe and the United States is small compared to the effects of natural factors and farming practices, while others have the opposite view.