The quality of plants degraded because of the increase of the concentration of CO2 in the atmosphere?

In 50 years, the concentration of CO2 in the atmosphere should reach 450-550 ppm (parts per million) against the current value of 375 ppm. This increase does not only bring about the global warming of the planet, but it also influences plants.

The Institute of Agrarian Ecology of the FAL (Federal Agricultural Research Establishment) in Braunschweig (Lower Saxony) is studying these effects in expensive greenhouses with open-field growing conditions where the CO2 content can be mastered. of the atmosphere. Experiments were carried out on forage plants and cereals in a higher CO2 atmosphere (550-650 ppm) and they showed that at these concentrations, the plants had a reduced nitrogen content and consequently produced fewer proteins. . Not only is the nutrient quality of plants decreasing, but the agrarian ecosystem is likely to change with a change in
growth, survival and spread of herbivorous insects and parasites. This can also have an effect on litter decomposition and soil mineralization.

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contacts:
- Teacher. Dr. H.-J. Weigel, Bundesforschungsanstalt fur Landwirtschaft (FAL),
Institut fur Agrarokologie, Bundesallee 50, 38116 Braunschweig - email:
hans.weigel@fal.de, http://www.aoe.fal.de
Sources: Depeche idw, press release of the Bundesforschungsanstalt fur
Landwirtschaft (FAL), 13 / 04 / 2005
Editor: Sophie Fourmond, sophie.fourmond@diplomatie.gouv.fr

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