Escobar-Torrez K., Ledru Marie-Pierre, Cassino R. F., Bianchini P. R., Yokoyama E. (2023). Long-and short-term vegetation change and inferred climate dynamics and anthropogenic activity in the central Cerrado during the Holocene. Journal of Quaternary Science, [Early access], p. [15 p.]. ISSN 0267-8179.
Titre du document
Long-and short-term vegetation change and inferred climate dynamics and anthropogenic activity in the central Cerrado during the Holocene
Escobar-Torrez K., Ledru Marie-Pierre, Cassino R. F., Bianchini P. R., Yokoyama E.
Source
Journal of Quaternary Science, 2023,
[Early access], p. [15 p.] ISSN 0267-8179
A paleoecologic analysis of pollen, macrocharcoal and trace elements from a lacustrine sediment core located at Lake Feia, central Cerrado (Goias State, Brazil), was used to evaluate the relationship between vegetation, fire and climate during the Holocene. The development of cerrado vegetation appears to have begun 6000 years ago, initially with the establishment of an open cerrado, followed from 4800 cal a BP by a change to a woody cerrado driven by an increase in summer insolation. The increases in precipitation levels in the central Cerrado during the last 5000 years are related to the increased influence of the Amazon in central Brazil, which has facilitated biomass burning and anthropogenic activities in the region of Lake Feia. Multi-centennial-scale changes in water level-related and gallery forest pollen assemblages indicate three main dry episodes, at 3440-2760, 2700-1690 and 1330-1150 cal a BP, linked to regional shifts between northern and southern South American summer monsoon boundaries. The presence of low continuous fire activity does not appear to have affected vegetation recovery, whereas two intervals with increased fire activity, at similar to 3300 and similar to 1300 cal a BP, indicated a slower recovery.
Plan de classement
Sciences du milieu [021]
;
Sciences du monde végétal [076]
;
Etudes, transformation, conservation du milieu naturel [082]
