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Vegetación del Holoceno en el Cañón del Chaco, Nuevo México
Science (New York, N.Y.)
|November 6, 1981
Resumen
Los centros de Packrat revelan el Cañón del Chaco.
Área de la Ciencia:
- Paleoecología Paleoecología.
- La paleobotánica es la paleobotánica.
- Ciencia Cuaternaria La ciencia cuaternaria es la ciencia cuaternaria.
Sus antecedentes:
- Packrat middens proporcionan registros detallados de la vegetación pasada.
- Estudios anteriores se basaron en el polen fósil, que puede ser menos preciso.
- La historia de la vegetación del Holoceno del Cañón del Chaco es crucial para comprender la ecología regional.
Objetivo del estudio:
- Para reconstruir los cambios de vegetación en el Cañón del Chaco durante los últimos 11.000 años.
- Para investigar los impulsores de los cambios de vegetación, en particular el declive de los bosques de pinión y enebro.
- Evaluar las implicaciones ecológicas a largo plazo de las actividades humanas pasadas.
Principales métodos:
- Análisis de los macrofósiles de plantas conservadas en las medias de packrat.
- Datación de las capas medias para establecer un marco cronológico.
- Comparación de los datos medios con los registros paleoecológicos existentes.
Principales resultados:
- Las comunidades de la Cuenca de San Juan del Holoceno temprano incluían abeto de Douglas, enebro y pino, desafiando las reconstrucciones basadas en el polen.
- La vegetación del Holoceno medio y tardío estaba dominada por bosques de piñón y enebro hasta la ocupación anasazi.
- Una reducción significativa en pinyon y enebro después de hace 1230 años está vinculada a las necesidades de combustible de Anasazi en lugar del cambio climático.
- Recuperación limitada del pinión y el enejero durante el último milenio.
Conclusiones:
- Los datos de mediados de Packrat ofrecen una comprensión más refinada de la dinámica de la vegetación pasada.
- El consumo de combustible de los anasazi tuvo un impacto significativo en los bosques de pinyon y enebro del Cañón Chaco.
- La supresión a largo plazo del pinión-enebro tiene consecuencias continuas para los ecosistemas forestales y de cordillera modernos.
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