Estructura y funcionalismo de un encinar montano en el Montseny. III: contenido de sodio, potasio, calcio y magnesio en las aguas de lluvia

• Autores: Ferrán Rodà de Llanza, Lluís Ferrés, Antonio María Claret Verdú González, Jaume Terradas Serra
• Localización: Mediterránea: Serie de estudios sobre biología terrestre mediterránea, ISSN 0210-5004, Nº. 4, 1980, págs. 37-50
• Idioma: español
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• Resumen

  • Volume and dissolved nutrient content (Na,K,Ca, and Mg) of incident precipitation and throughfall are under study in a montane-Mediterranean evergreen-oak (Quercus ilex L.) forest at La Castanya (Montseny, Barcelona). Amount of precipitation is measured with 4 (within) and 2 (outside the forest) polyethylene gauges with 19 cm funnels. Precipitation chemistry is monitored through 8 (within) and 2 (outside the forest) acid-washed, continuously-open polyethylene rain collectors with the funnels covered by a hood made of 2 mm plastic mesh to exclude insects and coarse debris. Rain collectors are changed by clean ones on a biweekly basis and the precipitation samples deep frozen until chemical analyses. This paper reports preliminary results from the first year of study : 24 June 1978 to 30 June 1979. As judged through the records of a nearby weather station, this year proved to be a normal one as for total rainfall, although an abnormal one as for monthly distribution of precipitations. Total incident precipitation and throughfall amounted to 969 and 617 mm, respectively. Concentrations of the four analysed cations were highly variable along the year (figs. 1-2), being generally higher in spring-summer than in autumn-winter rains both within and out side the forest. Volume-weighted mean concentrations are given in table 1, and nutrient fluxes in table 2. On the average, incident precipitation at La Castanya is relatively high in Ca (1.5 mg 1 ), medium in Na (0.7), and low in K (0.2) and Mg (0.2). Throughfall is enriched in all four elements with respect to incident precipitation: K 21 times, Mg 3 times, Ca 2.5 times, and Na 2 times.