Fluxes of oxidised and reduced nitrogen above a mixed coniferous forest exposed to various nitrogen emission sources
| Autor: | Patrick Berghmans, Gerrit Genouw, Johan Neirynck, Arnaud Carrara, Reinhart Ceulemans, Andrew S. Kowalski |
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| Rok vydání: | 2007 |
| Předmět: |
Nitrogen balance
Nitrogen Health Toxicology and Mutagenesis Nitrogen Dioxide Inorganic chemistry chemistry.chemical_element Nitrous Acid Acid Rain Nitric Oxide Toxicology Nitric Acid chemistry.chemical_compound Ammonia Nitrogen dioxide NOx Netherlands Aerosols Air Pollutants Nitrates Forestry Pinus sylvestris General Medicine Models Theoretical Throughfall Pollution Mixed coniferous forest Deposition (aerosol physics) chemistry Environmental chemistry Particulate Matter Nitrogen oxide Oxidation-Reduction Environmental Monitoring |
| Zdroj: | Environmental pollution |
| ISSN: | 0269-7491 |
| Popis: | Concentrations of nitrogen gases (NH(3), NO(2), NO, HONO and HNO(3)) and particles (pNH(4) and pNO(3)) were measured over a mixed coniferous forest impacted by high nitrogen loads. Nitrogen dioxide (NO(2)) represented the main nitrogen form, followed by nitric oxide (NO) and ammonia (NH(3)). A combination of gradient method (NH(3) and NO(x)) and resistance modelling techniques (HNO(3), HONO, pNH(4) and pNO(3)) was used to calculate dry deposition of nitrogen compounds. Net flux of NH(3) amounted to -64 ng N m(-2) s(-1) over the measuring period. Net fluxes of NO(x) were upward (8.5 ng N m(-2) s(-1)) with highest emission in the morning. Fluxes of other gases or aerosols substantially contributed to dry deposition. Total nitrogen deposition was estimated at -48 kg N ha(-1) yr(-1) and consisted for almost 80% of NH(x). Comparison of throughfall nitrogen with total deposition suggested substantial uptake of reduced N (+/-15 kg N ha(-1) yr(-1)) within the canopy. |
| Databáze: | OpenAIRE |
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