Caída de hojarasca en un ecotono Pinus sylvestris L.-Quercus pyrenaica Willd. en la Sierra de Guadarrama

  • E. Diaz-Pines Department of Silviculture and Pasciculture. Universidad Politécnica de Madrid.
  • A. Rubio Department of Silviculture and Pasciculture. Universidad Politécnica de Madrid.
  • F. Montes Departamento de Selvicultura y Gestión Forestal. CIFOR-INIA. Ctra. de A Coruña, km 7,5. 28
Palabras clave: caída de hojarasca, Pinus sylvestris, Quercus pyrenaica, ecotono, montaña mediterránea.

Resumen

La tasa de caída de hojarasca en parcelas puras de rebollo (Quercus pyrenaica Willd.), parcelas mixtas de rebollo y pino silvestre y parcelas puras de pino (Pinus sylvestris L.) fue estudiada en dos localizaciones de montaña mediterránea durante 36 y 29 meses, respectivamente. Se llevó a cabo una separación de los componentes de la hojarasca, y se determinó el porcentaje de C en cada una de las fracciones, para calcular un flujo de entrada de C al suelo debido al desfronde. Nuestros resultados muestras que la tasa de caída de hojarasca fue más alta en parcelas de pino que de rebollo, alrededor del doble (1.8-2.4 Mg C ha–1 año–1 en pino frente a 0.9-1.4 Mg C ha–1 año–1 en rebollo); las parcelas mixtas mostraron valores intermedios. Las acículas u hojas contribuyeron alrededor del 50% al total de caída de hojarasca. El patrón estacional mostró un máximo de caída de hojarasca de rebollo en otoño y comienzos de invierno, mientras que en las parcelas de pino, dicho máximo se produjo en verano, lo que es congruente con la fisiología de la caída de hojas o acículas en frondosas y coníferas en estas latitudes, pero desmarcándose de los valores obtenidos en Europa Central y del Norte. Un año con primavera seca coincidió con un desfronde de hojas de rebollo menor; asimismo, la caída de la hoja se adelantó algunas semanas con respecto al año con una primavera lluviosa.

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Publicado
2011-12-04
Cómo citar
Diaz-Pines, E., Rubio, A., & Montes, F. (2011). Caída de hojarasca en un ecotono Pinus sylvestris L.-Quercus pyrenaica Willd. en la Sierra de Guadarrama. Forest Systems, 20(3), 485-495. https://doi.org/10.5424/fs/20112003-11083
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Artículos de investigación