Throughfall Chemistry and Canopy Interactions in Urban and Suburban Coniferous Stands


  • Jūratė Žaltauskaitė Department of environmental sciences, Vytautas Magnus university
  • Romualdas Juknys Department of environmental sciences, Vytautas Magnus university


dry deposition, leaching, net throughfall, throughfall, uptake, urban-suburban


The research into atmospheric deposition by means of throughfall estimates were carried out in 2001-2004 in urban and suburban coniferous stands. Collection of bulk and throughfall deposition was performed on a monthly basis from April to November. The basic aim of the study was to investigate dry deposition contribution to total deposition at coniferous stands differently exposed to local pollution source. Bulk and throughfall deposition of anions in suburbs exceeded that in an urban site. Our results show that dry deposition is the main reason leading to enrichment of throughfall in ions of anthropogenic provenance (SO42-, NO3-, Cl- and NH4+). Regression analysis has revealed that the forest situated in the suburbs in the direction of the prevailing winds receive higher amounts of dry sulphur and nitrogen deposition than the forests growing in the city territories. It has been established that retained bigger amounts of anions deposition lead to the higher loss of base cations, especially of potassium.