caa a22 4500 475750985 CHVBK 20180406123523.0 cr unu---uuuuu 170329e20000701xx s 000 0 eng 10.1023/A:1009847202648 doi (NATIONALLICENCE)springer-10.1023/A:1009847202648 Buffering capacity through cation leaching of Pinus radiata D. Don canopy [Elektronische Daten] [Ander González-Arias, Ibone Amezaga, Arsenio Echeandía, Miren Onaindia] The change in the composition of atmospheric deposition as it passes through the forest canopy on two 10-year-old Pinus radiata D. Don forests (Manzanal and Posadero) was studied in the Basque Country, analysing the concentration of different constituents in bulk precipitation and throughfall. The precipitation at the study sites was bimodal with two maxima in the year; one in late spring and another one in late autumn. Posadero had a mean annual precipitation of 1223.6mm with an interception loss of 27.5% by the forest canopy and Manzanal had a mean annual precipitation of 978.6mm with the interception loss being 22.2% of it. Constituent concentrations followed a similar seasonal variation, increasing during the summer when precipitation decreases. At both study sites the chemical species analysed in bulk precipitation and throughfall were characterised by the fact that they came from three distinct sources: acidic pollution, marine and terrestrial origin. Concentration of constituents in bulk precipitation in Manzanal was higher than in Posadero, most probably due to the smaller amount of precipitation that falls in this study site. The precipitation at Manzanal had a significantly lower pH than at Posadero. The amounts of sulphate, nitrate-nitrogen, organic nitrogen and protons that fell in the bulk precipitation at Manzanal (the polluted site) were higher than those that fell at Posadero (less polluted site). The concentration of organic nitrogen in the bulk precipitation of the polluted site was significantly related to the hydrocarbon concentration measured in the atmosphere in the nearby town of Muskiz. Throughfall in Manzanal had higher amounts of sulphate, nitrate-nitrogen, calcium, magnesium, sodium, potassium and chloride than in Posadero. This fact suggests that both dry deposition and canopy leaching were an important source of throughfall constituents in Manzanal. The amount of manganese measured in Posadero throughfall was higher than that found in Manzanal throughfall. The pH in the throughfall did not show any significant difference between sites and was significantly higher than in bulk precipitation. Thus, canopies in the study sites seem to be able to neutralise very efficiently the acidic load of bulk deposition. Despite this buffering capacity of the canopies, the soil at Manzanal appeared to be more acidic than at Posadero, probably due to the liberation of protons in the rhizosphere when the neutralisingpacity of the canopy is 'srecharged'. This soil acidification may be leading to a greater solubilization of aluminium in the polluted site which could suffer from cation nutrient deficiencies in the future. Kluwer Academic Publishers, 2000 atmospheric deposition nationallicence cation leaching nationallicence cycling of nutrients nationallicence forests nationallicence nutrient imbalance nationallicence proton load nationallicence González-Arias Ander Landare-Biologia eta Ekologia Saila, Euskal Herriko Unibertsitatea, 48080Bilbao, Bizkaia, Spain aut Amezaga Ibone Dpto. Ciencias del Medio Natural, Universidad Pública de Navarra, Iruã, Navarra, Spain aut Echeandía Arsenio Laboratorio de Salud Pública, Dpto. de Sanidad, Gobierno Vasco, Bilbao, Bizakia, Spain aut Onaindia Miren Landare-Biologia eta Ekologia Saila, Euskal Herriko Unibertsitatea, 48080Bilbao, Bizkaia, Spain aut Plant Ecology Kluwer Academic Publishers 149/1(2000-07-01), 23-42 1385-0237 149:1<23 2000 149 11258 https://doi.org/10.1023/A:1009847202648 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1009847202648 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- González-Arias Ander Landare-Biologia eta Ekologia Saila, Euskal Herriko Unibertsitatea, 48080Bilbao, Bizkaia, Spain aut NATIONALLICENCE 700 1- Amezaga Ibone Dpto. Ciencias del Medio Natural, Universidad Pública de Navarra, Iruã, Navarra, Spain aut NATIONALLICENCE 700 1- Echeandía Arsenio Laboratorio de Salud Pública, Dpto. de Sanidad, Gobierno Vasco, Bilbao, Bizakia, Spain aut NATIONALLICENCE 700 1- Onaindia Miren Landare-Biologia eta Ekologia Saila, Euskal Herriko Unibertsitatea, 48080Bilbao, Bizkaia, Spain aut NATIONALLICENCE 773 0- Plant Ecology Kluwer Academic Publishers 149/1(2000-07-01), 23-42 1385-0237 149:1<23 2000 149 11258 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer