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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Nitrogen dioxide (NO
2
) uptake by vegetation controlled by atmospheric concentrations and plant stomatal aperture
Atmospheric Environment, Volume 45, No. 32, Year 2011
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Description
Nitrogen dioxide (NO2) exchange between the atmosphere and five European tree species was investigated in the laboratory using a dynamic branch enclosure system (consisting of two cuvettes) and a highly specific NO2 analyzer. NO2 measurements were performed with a sensitive gas phase chemiluminescence NO detector combined with a NO2 specific (photolytic) converter, both from Eco-Physics (Switzerland). This highly specific detection system excluded bias from other nitrogen compounds. Investigations were performed at two light intensities (Photosynthetic Active Radiation, PAR, 450 and 900 μmol m-2 s-1) and NO2 concentrations between 0 and 5 ppb. Ambient parameters (air temperature and relative humidity) were held constant. The data showed dominant NO2 uptake by the respective tree species under all conditions. The results did not confirm the existence of a compensation point within a 95% confidence level, though we cannot completely exclude emission of NO2 under very low atmospheric concentrations. Induced stomatal stricture, or total closure, by changing light conditions, as well as by application of the plant hormone ABA (Abscisic Acid) caused a corresponding decrease of NO2 uptake. No loss of NO2 to plant surfaces was observed under stomatal closure and species dependent differences in uptake rates could be clearly related to stomatal behavior. © 2011 Elsevier Ltd.
Authors & Co-Authors
Chaparro-Suarez, I. G.
Germany, Mainz
Max Planck Institute for Chemistry
Meixner, Franz X.
Germany, Mainz
Max Planck Institute for Chemistry
Zimbabwe, Harare
University of Zimbabwe
Kesselmeier, J.
Germany, Mainz
Max Planck Institute for Chemistry
Statistics
Citations: 104
Authors: 3
Affiliations: 2
Identifiers
Doi:
10.1016/j.atmosenv.2011.07.021
e-ISSN:
18732844
Research Areas
Cancer
Environmental