Long-term effects of changing atmospheric pollution on throughfall, bulk deposition and streamwaters in a Mediterranean forest
The abatement programs implanted in Europe to reduce SO₂, NO₂ and NH³ emissions are here evaluated by analyzing the relationships between emissions in Spain and neighboring countries and atmospheric deposition in a Mediterranean forest in the Montseny mountains (NE Spain) for the last 3decades. A ca...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:147716 |
| Acceso en línea: | https://ddd.uab.cat/record/147716 https://dx.doi.org/urn:doi:10.1016/j.scitotenv.2015.12.017 |
| Access Level: | acceso abierto |
| Palabra clave: | Atmospheric deposition Canopy Emission reductions Nitrogen Sulfate Throughfall |
| Sumario: | The abatement programs implanted in Europe to reduce SO₂, NO₂ and NH³ emissions are here evaluated by analyzing the relationships between emissions in Spain and neighboring countries and atmospheric deposition in a Mediterranean forest in the Montseny mountains (NE Spain) for the last 3decades. A canopy budget model was applied to throughfall data measured during a period of high emissions (1995-1996) and a period of lower emissions (2011-2013) to estimate the changes in dry deposition over this time span. Emissions of SO₂ in Spain strongly decreased (77%) and that was reflected in reductions for nssSO4² in precipitation (65% for concentrations and 62% for SO4²-S deposition). A lower decline was found for dry deposition (29%). Spanish NO₂ emissions increased from 1980 to 1991, remained constant until 2005, and decreased thereafter, a pattern that was paralleled by NO3(-) concentrations in bulk precipitation at Montseny. This pattern seems to be related to a higher share of renewable energies in electricity generation in Spain in recent years. However, dry deposition increased markedly between 1995 and 2012, from 1.3 to 6.7kgha¯¹year¯¹. Differences in meteorology between periods may have had a role, since the recent period was drier thus probably favoring dry deposition. Spanish NH³ emissions increased by 13% between 1980 and 2012 in Spain but NH₄⁺ concentrations in precipitation and NH₄⁺-N deposition showed a decreasing trend (15% reduction) at Montseny, probably linked to the reduction ammonium sulfate and nitrate aerosols to be scavenged by rainfall. NH₄⁺-N dry deposition was similar between the compared periods. The N load at Montseny (15-17kgha¯¹year¯¹) was within the critical load range proposed for Mediterranean sclerophyllous forests (15-17.5kgha¯¹year¯¹). The onset of N saturation is suggested by the observed increasing N export in streamwaters. |
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