The Critical Levels of Atmospheric Ammonia in a Mediterranean Holm-Oak Forest in North-Eastern Spain

  • Laura Aguillaume
  • Anna Avila
  • Pedro Pinho
  • Paula Matos
  • Esteve Llop
  • Cristina Branquinho
Article

Abstract

Despite recent regulations, atmospheric ammonia (NH3) emissions have not changed much over the last decades and excessive nitrogen remains as one of the major drivers for biodiversity changes. To prevent deleterious effects on species and ecosystems, it is very important to establish safety thresholds, such as those defined by the Critical Level (CLE) concept, “the concentration above which direct adverse effects on receptors may occur, based on present knowledge.” Empirical critical levels of atmospheric NH3 have mainly been reported for temperate forests and there is a lack of information for Mediterranean forests. Here, we provide a case study on NH3 CLEs for a typical Mediterranean ecosystem, the holm-oak (Quercus ilex) forest. To derive the CLE value, we measured NH3 concentrations for 1 year at a distance gradient in the forest surrounding a point source (cattle farm) and used diversity changes of lichen functional groups to indicate the onset of adverse effects. We estimate a NH3 CLE threshold of 2.6 μg m−3, a value that is higher than that reported in other Mediterranean ecosystems and suggests that the site has been already impacted by NH3 pollution in the past. In a more general context, this study confirms the validity of lichen functional groups to derive CLEs in Mediterranean forests and woodlands and contribute to the body of knowledge regarding the impacts of NH3 on ecosystems.

Keywords

Critical levels Ammonia Ecological indicators Lichen functional groups Mediterranean Quercus ilex forest N pollution 

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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  • Laura Aguillaume
    • 1
  • Anna Avila
    • 1
    • 2
  • Pedro Pinho
    • 3
    • 4
  • Paula Matos
    • 3
  • Esteve Llop
    • 5
  • Cristina Branquinho
    • 3
  1. 1.CREAF, Centre for Ecological Research and Forestry ApplicationsCerdanyola del VallèsSpain
  2. 2.Universitat Autònoma de BarcelonaCerdanyola del VallèsSpain
  3. 3.cE3c, Centre for Ecology, Evolution and Environmental Changes, Faculdade de CiênciasUniversidade de LisboaLisbonPortugal
  4. 4.Cerena, Centre for Natural Resources and the Environment, Instituto Superior TécnicoUniversidade de LisboaLisboaPortugal
  5. 5.Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals-Botànica i MicologiaUniversitat de BarcelonaBarcelonaSpain

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