Effects of air pollutants on vegetation and soils of grassland ecosystems. 2. The concentrations of selected air pollutants in South East Lower Saxony in the past two decades
1988
Gruenhage, L. (Bundesforschungsanstalt fuer Landwirtschaft, Braunschweig (Germany, F.R.). Inst. fuer Produktions- und Oekotoxikologie) | Daemmgen, U. | Jaeger, H.J.
Investigations in order to evaluate the influence of air pollutants on permanent grassland ecosystems have been performed since 1983/84. The plots, however, were installed in the late sixties. We regard the condition of the ecosystem under investigation in 1983 as the result of the influences of the physical climate, the management, the soil conditions including water supply and of the chemical climate (concentrations of gases and particulate matter, depositions). Therefore we investigated the potential load of our plots in the past with sulphur dioxide, suspended particulate matter, nitrogen oxides, ammonia, and ozone using data provided by literature and by own measurements. There is a definite risk for every sensitive plants to be affected by SO2. This will be diminished only, when in addition to the present emission situation in South East Lower Saxony the intensity and the frequency of "imported" London type smog episodes are reduced. The N inputs exceed the generally accepted critical loads for forests and heath ecosystems by far.
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