Response of grassland ecosystem to air pollutants: I-Experimental concept and site of the Braunschweig grassland investigation program.

Between 1984 and 1991 in Braunschweig (South-east Lower Saxony, Germany) experiments concerning the influence of chronic stress by air pollutants to a permanent grassland ecosystem were performed, the conceptual background of which is dealt with in this paper. The site itself, the management practices and treatments applied, and the physical climate are described in detail.