Reconstructing Holocene landscape and environmental changes at Lago Rogaguado, Bolivian Amazon

Umberto Lombardo, Heinz Veit, Walter Finsinger, Alena Giesche*

*Autor corresponent d’aquest treball

Producció científica: Contribució a revistaArticleRecercaAvaluat per experts

3 Cites (Scopus)
1 Descàrregues (Pure)

Resum

We performed geochemical analyses of two lake sediment cores (1.25 and 1.5 m long) from Lago Rogaguado, which is a large (315 km2) and shallow lake in the Llanos de Moxos, Bolivian Amazon, to investigate Holocene environmental changes based on a multi-proxy dataset (XRF, density, grain size, C:N, and macrocharcoal). One of the two cores provides a history of environmental changes in the Llanos de Moxos from 8100 cal BP until present, which supplements previously published pollen and microscopic charcoal records. Our analyses indicate lake expansion at 5800 cal BP, which may relate to tectonic activity. This was followed by further increasing lake levels, peaking at approximately 1050–400 cal BP, which supports increasingly wetter conditions in the Llanos de Moxos after the mid-Holocene. A fourfold increase in macroscopic charcoal accumulation rate and a more than fivefold increase in sedimentation rates supports anthropogenic fire activity at around 1450 cal BP (500 CE), suggesting that pre-Columbian populations used fire to actively manage the landscape during a period of maximum lake levels around Lago Rogaguado. From 400–100 cal BP, higher C:N, larger grain sizes and peaks in macroscopic charcoal accumulation rates suggest increased watershed erosion associated with increased biomass burning, possibly related to intensified land use.

Idioma originalAnglès
Pàgines (de-a)235-253
Nombre de pàgines19
RevistaJournal of Paleolimnology
Volum65
Número2
DOIs
Estat de la publicacióPublicada - de febr. 2021

Fingerprint

Navegar pels temes de recerca de 'Reconstructing Holocene landscape and environmental changes at Lago Rogaguado, Bolivian Amazon'. Junts formen un fingerprint únic.

Com citar-ho