Web of Science: 21 citas, Scopus: 25 citas, Google Scholar: citas
Changes in atmospheric deposition and streamwater chemistry over 25 years in undisturbed catchments in a Mediterranean mountain environment
Àvila i Castells, Anna (Centre de Recerca Ecològica i Aplicacions Forestals)
Rodà, F. (Ferran), 1953- (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)

Fecha: 2012
Resumen: Surface water chemistry has changed in response to reduced atmospheric deposition of sulphur and acidity in many regions of Europe and North America. Most of these studies come from acidic or low-alkalinity surface waters under high acidic deposition. Mediterranean climates offer a different biogeochemical context, characterised by streamwaters of higher alkalinity and low acid inputs. In this paper, we use surveys of streamwater chemistry conducted in 1981-1984 and again in 2007 in the Montseny natural park (NE Spain) to test whether streamwaters of these well-buffered catchments respond to changes in atmospheric deposition, which has declined for S during the last decades in NE Spain while remaining about stable for nitrogen. The 23 sampled streams drained heathland, beech forests and evergreen oak forests in relatively undisturbed small catchments underlain by silicate bedrock. Bulk deposition of sulphate at Montseny decreased by 54% while nitrate bulk deposition increased (non-significantly) by 30% in this period. Total N deposition is estimated in the range 15-30 kg N ha¯¹ y¯¹ for NE Spain. This is well above threshold values (e. g. 10 kg N ha¯¹ y¯¹) reported as starting nitrogen saturation symptoms in forest ecosystems in Europe. Baseflow sulphate concentrations decreased on average by 47 μeq L¯¹ or 29% of early 1980s concentrations. Baseflow mean nitrate concentrations increased significantly but only from 5. 5 to 8. 9 μeq L¯¹. Thus, despite decades of high N deposition, these ecosystems appear to be still far from N saturation. Baseflow alkalinity and base cation concentrations increased substantially, probably a combined result of decreased S deposition, enhanced silicate weathering under current higher temperatures, reduced plant cation uptake as vegetation matures, and slightly drier conditions in the survey of 2007. Overall, these well-buffered catchments have shown sizable changes in baseflow chemistry in response to changed atmospheric deposition and other environmental changes.
Nota: Número d'acord de subvenció MEC/CGL2005-07543/CLI
Nota: Número d'acord de subvenció MICINN/CGL2009-13188-C03-01
Nota: Número d'acord de subvenció MICINN/CSD2008-00040
Derechos: Tots els drets reservats
Lengua: Anglès.
Documento: article ; recerca ; acceptedVersion
Materia: Alkalinity ; Base cations ; Fagus sylvatica ; Heathland ; Mediterranean ; Montseny mountains ; Nitrogen ; Quercus ilex ; Streamwater chemistry ; Sulphate
Publicado en: Science of the total environment, Vol. 434 (Sep. 2012) , p. 18-27, ISSN 0048-9697

DOI: 10.1016/j.scitotenv.2011.11.062

36 p, 1.0 MB

El registro aparece en las colecciones:
Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
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