Late Quaternary vegetation dynamics in the southern Amazon Basin inferred from carbon isotopes in soil organic matter

Auteurs :
DE FREITAS, H.A.
RUIZ PESSENDA, L.C.
ARAVENA, R.
MARQUES GOUVEIA, S.E.
DE SOUZA RIBEIRO, A.
BOULET, R.

Description :
Carbon isotopes of soil organic matter (SOM) were used to evaluate and establish the chronology of the vegetation dynamics of an ecosystem presently composed of savannas surrounded by forests. The study was carried out on a 200-km transect along highway BR 319, on the border of Amazonas and Rondônia states, in southern Amazon, Brazil. The results indicate that extensive forested areas existed in the Amazon during the last glaciation and that savanna vegetation expanded in response to warm and dry conditions during the early to middle Holocene.


Type de document :
Article de périodique

Source :
Quaternary research, issn : 0033-5894, 2001, vol. 55, n°. 1, p. 39-46, Collation : Illustration, Références bibliographiques : 39 ref.

Date :
2001

Editeur :
Pays édition : Etats-Unis, San Diego, CA, Elsevier