Web of Science: 9 cites, Scopus: 10 cites, Google Scholar: cites
Dry deposition and canopy uptake in Mediterranean holm-oak forests estimated with a canopy budget model : a focus on N estimations
Aguillaume Rodríguez-O'connor, Laura (Centre de Recerca Ecològica i Aplicacions Forestals)
Izquieta-Rojano, Sheila (Universidad de Navarra. Laboratorio Integrado de Calidad Ambiental)
García-Gomez, H. (Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (Espanya))
Elustondo, David (Universidad de Navarra. Laboratorio Integrado de Calidad Ambiental)
Santamaría Ulecia, Jesús Miguel (Universidad de Navarra. Laboratorio Integrado de Calidad Ambiental)
Alonso, Rocío (Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (Espanya))
Àvila i Castells, Anna (Centre de Recerca Ecològica i Aplicacions Forestals)

Data: 2017
Resum: Bulk/wet and throughfall fluxes of major compounds were measured from June 2011 to June 2013 at four Mediterranean holm-oak (Quercus ilex) forests in the Iberian Peninsula. Regression analysis between net throughfall fluxes and precipitation indicated that the best defined canopy process was leaching for K⁺ and uptake for NH₄⁺ at all sites. A more variable response between sites was found for Na⁺, Ca²⁺, SO₄²⁻ and Cl⁻, which suggests that the interplay of dry deposition, leaching and uptake at the canopy was different depending on site climate and air quality characteristics. A canopy budget model (CBM) was used to try to discriminate between the canopy processes and enable to estimate dry deposition and uptake fluxes at three of the sites that complied with the model specifications. To derive N uptake, an efficiency factor of NH₄⁺ vs. NO₃⁻ uptake (xNH₄) corresponding to moles of NH₄⁺ taken up for each NO₃⁻ mol, has to be determined. Up to now, a value of 6 has been proposed for temperate forests, but we lack information for Mediterranean forests. Experimental determination of N absorption on Quercus ilex seedlings in Spain suggests efficiency factors from 1 to 6. Based on these values, a sensitivity analysis for xNH₄ was performed and the NH₄N and NO₃N modeled dry deposition was compared with dry deposition estimated with independent methods (inferential modeling and washing of branches). At two sites in NE Spain under a milder Mediterranean climate, the best match was obtained for xNH4 = 6, corroborating results from European temperate forests. Based on this value, total DIN deposition was 12–13 kg N ha−1 y−1 at these sites. However, for a site in central Spain under drier conditions, variation of the NH4+ efficiency factor had little effect on DD estimates (which ranged from 2 to 2. 6 kg N ha⁻¹ y⁻¹ with varying xNH₄); when added to wet deposition, this produced a total N deposition in the range 2. 6–3. 4 kg N ha⁻¹ y⁻¹. Dry deposition was the predominant pathway for N, accounting for 60–80% of total deposition, while for base cations wet deposition dominated (55–65%). Nitrogen deposition values at the northwestern sites were close to the empirical critical load proposed for evergreen sclerophyllous Mediterranean forests (15–17 kg N ha⁻¹ y⁻¹). When organic N deposition at these forests is added (3 kg N ha⁻¹ y⁻¹), the total N input to the sites in NE Spain are close to the critical loads for Mediterranean evergreen oak forests.
Nota: Número d'acord de subvenció EC/282910
Nota: Número d'acord de subvenció EC/LIFE13 ENV/ES/000417
Nota: Número d'acord de subvenció MICINN/CGL2009-13188-C03-01/02/03
Nota: Número d'acord de subvenció MICINN/CSD2008-00040
Drets: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades. Creative Commons
Llengua: Anglès.
Document: article ; recerca ; acceptedVersion
Matèria: Wet deposition ; Throughfall ; Canopy exchange ; Mediterranean ; Nitrogen ; Critical loads
Publicat a: Atmospheric environment, Vol. 152 (March 2017) , p. 191-200, ISSN 1352-2310

DOI: 10.1016/j.atmosenv.2016.12.038


Postprint
37 p, 1.9 MB

El registre apareix a les col·leccions:
Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Articles > Articles de recerca
Articles > Articles publicats

 Registre creat el 2017-09-06, darrera modificació el 2019-04-03



   Favorit i Compartir