By K.-H. Narjes (auth.), P. Mathy (eds.)
In the concluding consultation of the symposium "Acid Deposition, a problem for Europe" held in Karlsruhe in September 1983, Dr. GINJAAR, the previous Minister of future health and Environmental defense of the Netherlands, emphasized the necessity for developing a concerted learn programme together with the results of pollution on terrestrial and aquatic ecosystems. The Council of Ministers of the eu group in 1984 followed a revision of the third neighborhood Programme on surroundings comprising agreement examine and concerted motion within the box of the results of pollution in eco structures. those learn parts have been additionally brought within the 4th R-D group Programme on surroundings, followed by means of the Council of Ministers in 1986 and are topic back to agreement learn and concerted motion. The fee of the ecu neighborhood is particularly involved to extend the effectiveness of researcn initiatives performed in the nationwide programmes, and people undertaken on the neighborhood point. The fee has a tendency to boost an built-in clinical procedure, together with not just the physico-chemical behaviour, the delivery and the deposition of airborne toxins but additionally the consequences of those toxins, specifically on dwelling organisms and ecosystems. in regards to the explicit factor of the results, the fee is attempting to improve and increase a multi-disciplinary process associating biologists, pathologists, eco physiologists, and experts of soil sciences, in the concerted motion, in addition to inside of coordinated learn projects.
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Additional info for Air Pollution and Ecosystems: Proceedings of an International Symposium held in Grenoble, France, 18–22 May 1987
La Commission, toujours sous rna responsabilite, a presente au Conseil des Ministres une serie de directives dans Ie but de reduire notablement les emissions des grosses installations de combustion et des vehicules a moteur. Bien que certaines d'entre elles, comme la reduction du contenu en souffre dans les liquides de combustion, aient franchi l'obstacle du Conseil, les plus importantes ne font pas encore partie du droit communautaire - ceci est desolant et je saisis l'occasion de faire un appel aux Etats a se mettre d'accord rapidement.
Southern California forests. , 1985). Premature loss of needles leading to decreased photosynthesis is the major visible symptom; mortality of ozone-weakened trees usually is caused by bark beetles and root-rotting fungi. The major tree species affected include ponderosa pine, Jeffrey pine, white fir, limber pine, incense cedar, and California black oak. Injured trees are distributed at random in part because of genetically controlled resistance and susceptibility to ozone. No studies have shown a loss in forest productivity.
Figure 2 shows that forest productivity (usually measured as the volume of stemwood produced per unit area of land at a given age) is relatively constant over a wide range of tree densities or total forest volumes (Langsaeter, 1941). Thus, pollution-induced changes in growth or mortality rates of randomly distributed genetically susceptible trees are not likely to affect the productivity of a whole forest unless the total number of affected trees becomes so large that the forest becomes understocked.