Joining empirical and modelling approaches to estimate dry deposition of nitrogen in Mediterranean forests

Héctor García-Gómez, Sheila Izquieta-Rojano, Laura Aguillaume, Ignacio González-Fernández, Fernando Valiño, David Elustondo, Jesús M. Santamaría, Anna Àvila, Andrzej Bytnerowicz, Victoria Bermejo, Rocío Alonso

    Research output: Contribution to journalArticleResearch

    3 Citations (Scopus)

    Abstract

    © 2018 Elsevier Ltd In Mediterranean areas, dry deposition is a major component of the total atmospheric N input to natural habitats, particularly to forest ecosystems. An innovative approach, combining the empirical inferential method (EIM) for surface deposition of NO3− and NH4+ with stomatal uptake of NH3, HNO3 and NO2 derived from the DO3SE (Deposition of Ozone and Stomatal Exchange) model, was used to estimate total dry deposition of inorganic N air pollutants in four holm oak forests under Mediterranean conditions in Spain. The estimated total deposition varied among the sites and matched the geographical patterns previously found in model estimates: higher deposition was determined at the northern site (28.9 kg N ha−1 year−1) and at the northeastern sites (17.8 and 12.5 kg N ha−1 year−1) than at the central-Spain site (9.4 kg N ha−1 year−1). On average, the estimated dry deposition of atmospheric N represented 77% ± 2% of the total deposition of N, of which surface deposition of gaseous and particulate atmospheric N averaged 10.0 ± 2.9 kg N ha−1 year−1 for the four sites (58% of the total deposition), and stomatal deposition of N gases averaged 3.3 ± 0.8 kg N ha−1 year−1 (19% of the total deposition). Deposition of atmospheric inorganic N was dominated by the surface deposition of oxidized N in all the forests (means of 54% and 42% of the dry and total deposition, respectively). The relative contribution of NO2 to dry deposition averaged from 19% in the peri-urban forests to 11% in the most natural site. During the monitoring period, the empirical critical loads provisionally proposed for ecosystem protection (10–20 kg N ha−1 year−1) was exceeded in three of the four studied forests. Dry deposition of atmospheric N in four forests of Quercus ilex represented 77% of the total deposition of N and it was dominated by the surface deposition of oxidized N.
    Original languageEnglish
    Pages (from-to)427-436
    JournalEnvironmental Pollution
    Volume243
    DOIs
    Publication statusPublished - 1 Dec 2018

    Keywords

    • Broadleaf evergreen
    • Inferential method
    • Quercus ilex
    • Spain
    • Stomatal conductance model

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