Holocene paleoecology of the Gran Sabana, SE Venezuela: preliminary pollen and microcharcoal analysis at Laguna Encantada ; Paleoecología del Holoceno en la Gran Sabana, SE Venezuela: Análisis preliminar de polen y microcarbones en la Laguna Encantada
The Gran Sabana region (SE Venezuela) is characterized by extensive neotropical savannas, in a warm and wet climate, apparently more suitable for the existence of rain forests. Two main types of hypotheses have been proposed to explain this situation: natural factors, such as climate changes or soil poverty, and burning by humans. This study analyzes the pollen and charcoal content of a 7,500 years old peat bog, at the shore of Laguna Encantada. The savanna landscape has dominated the area during the whole interval, but local fi res did not appear until around 1,200 years ago, when the present... Mehr ...
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Dokumenttyp: | Artikel |
Erscheinungsdatum: | 2009 |
Verlag/Hrsg.: |
Consejo Superior de Investigaciones Científicas
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Schlagwörter: | Fire / Mauritia / Microcharcoal / Palaeoecology / Pollen / Savannas / Venezuela / Fuego / Microcarbones / Paleoecología / Polen / Sabanas |
Sprache: | Spanish |
Permalink: | https://search.fid-benelux.de/Record/base-27644153 |
Datenquelle: | BASE; Originalkatalog |
Powered By: | BASE |
Link(s) : | https://collectaneabotanica.revistas.csic.es/index.php/collectaneabotanica/article/view/30 |
The Gran Sabana region (SE Venezuela) is characterized by extensive neotropical savannas, in a warm and wet climate, apparently more suitable for the existence of rain forests. Two main types of hypotheses have been proposed to explain this situation: natural factors, such as climate changes or soil poverty, and burning by humans. This study analyzes the pollen and charcoal content of a 7,500 years old peat bog, at the shore of Laguna Encantada. The savanna landscape has dominated the area during the whole interval, but local fi res did not appear until around 1,200 years ago, when the present communities began to establish. An expansion of gallery forests, likely due to a climatic shift, has been recorded around 4,000 years ago, followed by a deforestation triggered by fire, leading to present-day situation. These results, together with former similar studies, suggest that the present Gran Sabana landscape resulted from the interaction of diverse factors, being climate changes more related to its origin and human induced fires more linked to the recent expansion. ; La región de la Gran Sabana, al SE de Venezuela, se caracteriza por la presencia de extensas sabanas neotropicales, en un clima cálido y húmedo, que parece más propicio para la existencia de bosques húmedos. Existen dos grandes grupos de hipótesis para explicar esta configuración vegetal: las naturales (cambios climáticos, pobreza de suelos) y las antrópicas (incendios provocados). El presente estudio utiliza el análisis de polen y microcarbones para reconstruir las tendencias paleoambientales, de la vegetación y del régimen de incendios, en la turbera litoral de la Laguna Encantada, durante los últimos 7.500 años. Las sabanas han dominado el paisaje durante todo este tiempo, a pesar de que los incendios locales no afectaron el área hasta hace unos 1.200 años, momento en el cual se establecen las comunidades actuales. Hacia los 4.000 años antes del presente tuvo lugar una expansión de los bosques de galería, causada por cambios climáticos, seguida de ...