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Impacto del dióxido de carbono atmosférico más bajo en los ecosistemas de montaña tropical

Street-Perrott¹, Huang, Perrott

¹F. A. Street-Perrott and R. A. Perrott are in the Tropical Palaeoenvironments Research Group, Department of Geography, University of Wales Swansea, Swansea SA2 8PP, UK. Y. Huang and G. Eglinton are at the Biogeochemistry Research C.

Science (New York, N.Y.)

|November 21, 1997

Resumen

Los períodos glaciales vieron valores de isótopos de carbono significativamente más altos en los lagos de montaña de África Oriental debido al aumento de los organismos concentradores de CO2. Esto indica que la limitación de carbono afectó a la vegetación, no solo a la temperatura, afectando la distribución de los bosques.

Área de la Ciencia:

Paleoclimatología Paleoclimatología
La geoquímica de los isótopos es la geoquímica de los isótopos.
Ecología Ecología Ecología.

Sus antecedentes:

Las montañas tropicales de gran altitud son indicadores sensibles del cambio climático pasado.
Comprender los niveles pasados de dióxido de carbono atmosférico (CO2) es crucial para las reconstrucciones climáticas.
Estudios anteriores han utilizado principalmente los cambios de vegetación para inferir las condiciones climáticas pasadas.

Objetivo del estudio:

Para investigar las causas de los valores elevados de isótopos de carbono en los lagos de montaña de África Oriental durante los períodos glaciales.
Determinar el papel de los mecanismos de concentración de CO2 en los cambios de vegetación pasados.
Para evaluar la confiabilidad de la elevación de la línea de árboles como un sustituto de la paleotemperatura.

Principales métodos:

Análisis de los valores de isótopos de carbono (δ13C) en la masa de materia orgánica de los sedimentos de los lagos.
Análisis isotópicos específicos de compuestos de ceras de hojas y biomarcadores de algas.
Reconstrucción de niveles pasados de CO2 y composición de la vegetación.

Principales resultados:

La materia orgánica a granel mostró valores de δ13C 1014‰ más altos durante las épocas glaciales en comparación con el presente.
Los análisis de isótopos identificaron hierbas C4 y algas de agua dulce con mecanismos de concentración de CO2 como los principales impulsores de este aumento.
La evidencia sugiere una limitación significativa de carbono debido a las presiones parciales de CO2 atmosférico más bajas durante los períodos glaciales.

Conclusiones:

La distribución pasada de la vegetación en las montañas tropicales fue influenciada tanto por el clima como por la disponibilidad de CO2.
El impacto significativo de la limitación de carbono desafía el uso de la elevación de la línea de árboles para inferir paleotemperaturas.
La geoquímica de isótopos proporciona una poderosa herramienta para comprender las respuestas ecológicas pasadas a los cambios climáticos y de CO2.

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