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Natural Radiocarbon Measurements in Brazilian Soils Developed on Basic Rocks

Published online by Cambridge University Press:  18 July 2016

L. C. R. Pessenda ,
E. P. E. Valencia ,
P. B. Camargo ,
E. C. C. Telles ,
L. A. Martinelli ,
C. C. Cerri ,
Ramon Aravena  and
Kazimierz Rozanski
L. C. R. Pessenda
Affiliation:
Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, 13400-970 Piracicaba, São Paulo, Brazil
E. P. E. Valencia
Affiliation:
Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, 13400-970 Piracicaba, São Paulo, Brazil
P. B. Camargo
Affiliation:
Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, 13400-970 Piracicaba, São Paulo, Brazil
E. C. C. Telles
Affiliation:
Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, 13400-970 Piracicaba, São Paulo, Brazil
L. A. Martinelli
Affiliation:
Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, 13400-970 Piracicaba, São Paulo, Brazil
C. C. Cerri
Affiliation:
Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, 13400-970 Piracicaba, São Paulo, Brazil
Ramon Aravena
Affiliation:
Earth Science Department, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
Kazimierz Rozanski
Affiliation:
Isotope Hydrology Section, International Atomic Energy Agency, Wagramerstr. 5, P. O. Box 100, A-1400 Vienna, Austria
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Abstract

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This paper presents 14C, 13C and chemical data of soil organic matter (SOM) in three soil profiles under native forests from Brazil: Londrina (southern), Piracicaba (southeastern) and Altamira (northern). The main objective is to use carbon isotopes in tropical and subtropical soils of Brazil to provide information about vegetation changes that occurred in relation to climate changes during the Holocene. 14C data from SOM indicate that the organic matter in the soils studied is of at least Holocene age. 13C data indicate that C4 plants probably provided the dominant vegetation in Londrina and Piracicaba during the early and mid-Holocene and that C3 plants provided the dominant vegetation in the Altamira region during the Holocene.

Type
14C and Soil Dynamics: Special Section
Information
Radiocarbon , Volume 38 , Issue 2 , 1996 , pp. 203 - 208
Copyright
Copyright © The American Journal of Science 

References

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