Dry deposition to the forest canopy and surrogate surfaces in two mediterranean holm oak forests in montseny (NE Spain)

Anselm Rodrigo, Anna Àvila

Research output: Contribution to journalArticleResearchpeer-review

27 Citations (Scopus)

Abstract

The fluxes recovered from washing branches and surrogate surfaces were compared for two holm oak (Quercus ilex L.) forests in the Montseny mountains (NE Spain) differentially exposed to pollution. For 5 periods in May and June 1996 after exposures ranging between 68-189 hr, 6 metacrylate plates and 8 branches were extracted with distilled water. Also, a sequential washing of branches was undertaken, with 5 min separations between the 3 initial washes, one hour between the 3rd and the 4th, and 6 hr between the 4th and the last one. The composition was analysed for PO43-, SO42-, NO3-, Cl, F, NH+4, Ca2+, Mg2+, Na+, K+, Cu, Pb, Mn, Co, Ni and Zn. The applied techniques were consistent in that dry deposition would account for the throughfall fluxes of NO3-, Cl-, Cu and Zn. Potassium and Mn would derive mostly from leaching and their fluxes were strongly related with the holm oak flower growth. For Mg2+ and SO42- either leaching or impaction of small particles or gases (for SO42-) could account for the recovered fluxes. Also for Na+ and Ca2+ the experiments did not produce conclusive results. Ammonium, F, Pb, Co, and Ni were under the detection limit of analytical techniques in the plate-wash. The exposed site presented higher leaf-wash and plate-wash fluxes for all elements. This was attributed to its higher exposure to pollutants, and for leaching-derived elements, to its higher site fertility.
Original languageEnglish
Pages (from-to)269-288
JournalWater, Air, and Soil Pollution
Volume136
DOIs
Publication statusPublished - 8 Jun 2002

Keywords

  • Dry deposition
  • Foliar leaching
  • Major ions
  • Mediterranean
  • Quercus ilex
  • Surrogate surfaces
  • Trace metals

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