首页|Pinus sylvestris and Picea abies canopy effects on deposition of air pollutants
Pinus sylvestris and Picea abies canopy effects on deposition of air pollutants
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Tree canopies influence atmospheric pollutant depositions depending on type,ecosystem characteristics,and local climatic conditions.This study investigated the impact of Pinus sylvestris L.and Picea abies(L.)H.Karst.,and a mixture of both,on the chemical composition of pre-cipitation.Three permanent plots within the ICP forest levelⅡ monitoring network in Lithuania were selected to illustrate typical hemiboreal coniferous forests.The study analysed(1)the concentrations of NO2,NH3 and SO2 in the ambi-ent air;(2)the concentrations of SO42-,NO3-,NH4+,Na+,K+,Ca2+and Cl-in throughfall beneath canopies and in precipitation collected in an adjacent field,and(3)S and total N,Na+,K+,Ca2+and Cl-depositions in throughfall and precipitation over 2006-2022.Results show a signifi-cant decrease in SO2 emissions in the ambient air;NO2 and NH3 emissions also decreased.The canopies reduced the acidity of throughfall,although they led to notably higher concentrations of SO42-,NO3-,Na+,and particularly K+.During the study,low variability in NO3-deposition and a decrease in NH4+deposition occurred.Deposition loads increased by 20-30％when precipitation passed through the canopy.The cumulative deposition of S,Cl,Na,K,Ca,and N was greater under P.abies than under P.sylvestris.How-ever,K deposition in throughfall was considerably lower under P.sylvestris compared to the P.abies or mixed stand.Throughfall S depositions declined across all three conifer-ous plots.Overall,there was no specific effect of tree species on throughfall chemistry.
PrecipitationThroughfallDeposition of chemicalsPollutionLithuania
Lithuanian Research Centre for Agriculture and Forestry,Instituto Av.1,Akademija,58344 Kėdainiai distr.,Lithuania
Valentinas ?erniauskas PhD project(2021-2025)Long-Term Research Program'Sustainable Forestry and Global Changes'at the Lithuanian Agricultural and Forestry Research CentICP Forest Level Ⅱnetwork(Lithuania)
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