1957～1990年西北威尔士地区土壤酸性的增加

Increases in Soil Acidity in North-West Wales Between 1957 and 1990

由自然界或人类活动排出的氧化硫或氧化氮所造成的酸沉降,会加剧土壤中阳离子的淋溶。如果土壤排水析出的主要离子是硫或氮,那么,为了保持土壤电荷呈中性就需要当量浓度阳离子。析出的阳离子常常被土壤交换体系用氢离子替代,结果,土壤的酸度增加。欧洲许多国家都报道过这种主要由人为排放二氧化硫和二氧化氮造成的土壤酸化问题。然而。

Increases in soil acidity,thought to have resulted from man-made emissons of mainly SO_2 and NO_x,are docu- mented for a number of countries in Europe.Here evidence is presented that suggests acidification has occurred also in one part of Britain,over a 33-year period.The soils investigated occur in a part of Britain having one of the highest recorded rates of wet deposition of acidifying substances,and some of the most sensitive ecosystems. The extent of acidification appears to be broadly inversely related to the soil acidity value of the initial determination.It is suggested,from other work,that man's industrial activities have been a substantial factor in causing the increased acidification.