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 Activité_4_-_Des_indicateurs_des_variations_climatiques_passées__-_les_pollens.pdf

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Monsieur Bernhard

November 09, 2024

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Transcript

  1. Comment connaître les climats du passé ? Chapitre 2 -

    la complexité du système climatique
  2. None

  3. Toundra (Alaska) Savane (Tanzanie) Forêt tropicale humide (Congo) Forêt de

    feuillus (Fontainebleau)

  4. Exemple d’échantillon contenant de nombreux pollens d’espèces variées

  5. Figure 2. Illustration de deux types de tourbe. A gauche,

    tourbe blonde à sphaignes dans un carottier. A droite, tourbe noire dérivant de roseaux et autres, en milieu moins acide. [Source : © A. Laplace-Dolonde]

  6. Tourbières et marais, des zones humides remarquables

  7. Deux étapes de l’évolution des tourbières du Luitel. [Source :

    Desplanque & Cave (2011), voir réf. 5]

  8. Débris végétaux extraits de la tourbe (à gauche) et pollen

    de pin (à droite). [Source : © V. Vergne]
  9. None

  10. Clé de détermination des pollens

  11. None
  12. None
  13. None
  14. None
  15. None
  16. None