Concentration, trend and distribution of reactive trace gases in rural Germany in the context of forest damage : Waldschadensforschung - Wissensstand und Perspektiven. Internationaler Kongress

1990

S. 165-205

24 Abb., 2 Tab., 9 Lit. Ang.

Unselbständiges Werk

200068545

In this talk we will report on concentrations of certain airborne gases which are considered as being relevant to the phenomenon Waldschaeden. We will present results from measurements of O3, SO2, and NO2 in surface near mainly over the terrain of the Federal Republic of Germany (FRG). Some measurements from the German Democratic Republic, from Holland and Switzerland will also be utilized. The data records from FRG were made available by the different agencies that are in charge to collect them. Results of concentration measurements from neigbouring countries were obtained through private communications or taken from published reports. Trends and geographical distribution will be discussed some in detail. However, since the compain talk by Mohnen will be concerned with these same species over the USA it is important in the context of Waldschaeden to also note the absolute concentrations of O3, SO2, and NO2 in rural FRG so that they con be compared to their respective levels over the forested areas of the USA. The main emphasis will be on ozone. That ozone alone or ozone in conjunction with climatic stress might be the dominating cause for Waldschaeden in Germany ("onzone hypothesis") has been proposed several times (c.f. Prinz et al. (1982)), so that it seems justified to check if the ozone hypothesis is consistent with the available information on forest damage on the one hand and ozone concentrations on the other hand.