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Título
Bulk deposition of atmospheric inorganic nitrogen in mountainous heathland ecosystems in North-Western Spain
Autor
Facultad/Centro
Área de conocimiento
Datos de la obra
Atmospheric Research, 2017, vol. 183
Editor
Elsevier
Fecha
2017-01-01
Résumé
Nitrogen (N) deposition has been identified as one of the main
traits of terrestrial ecosystems, affecting their structure and
functioning. Among terrestrial ecosystems, heathlands are characterised
by low nutrient status and highly affected by N deposition. However, few
studies have been developed under natural field conditions to evaluate
the amount of N deposition in these ecosystems. Therefore, a field
experiment was carried out to investigate the inorganic N inputs in
mountainous heathlands of North-Western Spain. Two study sites (La Majúa
and San Isidro) were selected on the south side of the Cantabrian
Mountains, as a representative monitoring N-sensitive ecosystems. Three
replicated bulk collectors and one rain gauge were installed at each
study site to collect monthly rainwater samples over three years. Wet
bulk N deposition was different between the study areas (2.81 kg N ha-1
year-1 in La Majúa and 4.56 kg N ha-1 year-1 in San Isidro), but showed
the same temporal pattern, with the highest N deposition rate observed in
April and the lowest in August-September. In general, annual wet bulk
NO3--N deposition was higher than NH4+-N, reflecting the prevailing NOX
emission sources. Depositions of NO3--N were mostly originated by NOX
emissions from northern highly industrialized and populated areas of
North Spain. The lower NH4+/NO3- ratio in rainwater observed in the study
area could be due to the decline of traditional land uses (livestock
grazing, heath burning and croplands) associated with NHY emissions.
Despite the low rates of N deposition observed in this study, N-sensitive
heathlands in North-Western Spain could be threatened by N depositions.
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