Science et changements planétaires / Sécheresse


Contribution de l’analyse pollinique à l’étude des changements de végétation et de climat en Europe Volume 4, issue 4, Décembre 1993

Botanique historique et Palynologie, URA CNRS 1152, Faculté des Sciences et Techniques, St-Jérôme, 13397 Marseille Cedex 20, France.
  • Page(s) : 233-40
  • Published in: 1993

For continents, pollen analysis - studying extinct plant formations and the history of man’s effect on the environment - represents the best approach to past climates. It demonstrates that the history of continent’s plants is a faithful reflection of the planet’s climatic cyclicity in the past. The pollen record of the last ice age requires that those aspects of plant evolution which could result in a possible change of climate in the future be examined regionally. It allows the biological recovery observed over the past few decades in demographically stable countries to be interpreted as a revival of ecosystems and biomasses inversely related to the historic effect of man on nature and not as the result of the recent rise in atmospheric CO 2 caused by man. Pollen analysis generates quantitative reconstructions of past climatic episodes very different to those of today and contributes to the experimental improvement of the general atmospheric circulation models required for forecasting future climates.