Dinámica del clima y la vegetación de los últimos 200 años del Holoceno en el humedal La Bramadora (Antioquia - Colombia)
Autores
Osorio Arango, Chixel Yennifer
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Tipo de contenido
Trabajo de grado - Maestría
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EspañolFecha de publicación
2016-12-30
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Resumen
Mediante un análisis polínico, estratigráfico y pérdidas por ignición; se reconstruyeron los cambios en la vegetación, clima (precipitación) y ambiente sedimentario del humedal La Bramadora, ubicado en el municipio de Sopetrán - Antioquia. Esta reconstrucción se realizó a lo largo de una columna sedimentaria de 200cm de profundidad con una edad de 200 años aproximadamente. Los resultados muestran que el sistema ha sido un pantano con fases de mayor y menor humedad. Cinco zonas fueron identificadas en el análisis polínico: I, II, III, IV y V. Las zonas IV y V (200-113 cm) reflejan condiciones muy húmedas, donde domina el polen de Typha domingensis. La zona III (113-62 cm) muestra una época muy seca, caracterizada por un aumento de la vegetación de borde de pantano y pantano como Pteridophyta y Cyperaceae y ausencia de vegetación acuática como Typha domingensis. Las zonas I y II (62-10 cm) reflejan un clima seco con algunos pulsos húmedos. Estos cambios reflejan condiciones similares a las reportadas en otros sectores del país.
Abstract: Through a polynic analysis, stratigraphic and ignition loss, we reconstructed the changes in the vegetation, the clime (precipitation) and the sedimentary environment of La Bramadora wetland, located in Sopetrán-Antioquia. This reconstruction was realized by the study of a sedimentary column of 200 cm deep and under the assumption of that the age of such samples is at around of 200 cal yr BP. The results obtained make us to note that the system was a swamp, but it has had higher and lower humidity periods. We identify five zones in the pollen analysis denoted by: I, II, III, IV and V. The zones IV and V (200-113 cm) reveal a very humid conditions, dominated by the pollen grain Typha domingensis. The zone III (113-62 cm) shows a very dry season characterized by an increase of the marsh and swamp border vegetation such as Pteridophyta and Cyperaceae and, it also shows a deficiency of aquatic vegetation such as Typha domingensis. The zones I and II (62-10 cm) reflect a dry clime with some humid pulses. These changes revel similar conditions to those reported in other sectors of the country.
Abstract: Through a polynic analysis, stratigraphic and ignition loss, we reconstructed the changes in the vegetation, the clime (precipitation) and the sedimentary environment of La Bramadora wetland, located in Sopetrán-Antioquia. This reconstruction was realized by the study of a sedimentary column of 200 cm deep and under the assumption of that the age of such samples is at around of 200 cal yr BP. The results obtained make us to note that the system was a swamp, but it has had higher and lower humidity periods. We identify five zones in the pollen analysis denoted by: I, II, III, IV and V. The zones IV and V (200-113 cm) reveal a very humid conditions, dominated by the pollen grain Typha domingensis. The zone III (113-62 cm) shows a very dry season characterized by an increase of the marsh and swamp border vegetation such as Pteridophyta and Cyperaceae and, it also shows a deficiency of aquatic vegetation such as Typha domingensis. The zones I and II (62-10 cm) reflect a dry clime with some humid pulses. These changes revel similar conditions to those reported in other sectors of the country.