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Stomatal uptake and cuticular adsorption contribute to dry deposition of NH 3 and NO 2 to needles of adult spruce ( Picea abies ) trees
Author(s) -
Geßler Arthur,
Rienks Michael,
Rennenberg Heinz
Publication year - 2002
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1046/j.1469-8137.2002.00509.x
Subject(s) - picea abies , transpiration , stomatal conductance , chemistry , fumigation , nitrogen , relative humidity , atmosphere (unit) , photosynthesis , deposition (geology) , humidity , botany , environmental chemistry , nitrogen dioxide , ammonia , horticulture , meteorology , paleontology , biochemistry , physics , organic chemistry , sediment , biology
Summary• In the present study NH 3and NO2exchange between the atmosphere and needles of adult spruce (Picea abies ) trees at a field site (‘Höglwald’) exposed to high loads of atmospheric nitrogen was assessed. • Twigs were fumigated with different NH 3(CNH3) or NO2(CNO2) concentrations using the dynamic chamber technique. Beside fluxes of NH3(JNH3) and NO2(JNO2), transpiration (JH2O), leaf conductance for water vapour (gH2O), photosynthetic activity (Jco2 ), photosynthetic photon fluence rate (PPFR), air temperature (T) and relative air humidity (RH) were determined. • Both fluxes, J NH3and JNO2, depended linearly on CNH3and CNO2in concentration ranges representative for the field site and gH2Oas a measure of stomatal aperture. For both trace gases compensation points could be determined amounting to 2.5 nmol mol−1for NH3and to 1.7 nmol mol−1for NO2 . • The fluxes of NH 3and NO2could not be explained exclusively by exchange through the stomata. In both NH3and NO2fumigation experiments additional deposition onto the needle surface was observed and increased with increasing CNH3and CNO2.15N[NH3] fumigation experiments with adult spruce trees confirmed the results of gas exchange measurements and revealed that NH3 ‐N deposited to spruce needles is subjected to long distance transport within the plant, supplying the plant with additional nitrogen from the atmosphere.