Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Dry deposition of particles and canopy exchange: comparison of wet-only, bulk and throughfall deposition in five forest sites in Italy |
| Abstract | The contribution of dry deposition to the total atmospheric input of acidifying compounds and base cations is of overwhelming importance. Throughfall measurements provide an estimate of the total deposition to forest soils, including dry deposition, but some uncertainties, related to the canopy interaction processes, affect this approach. We compared the concentrations and the fluxes of the main ions determined in wet-only, bulk and throughfall samples collected at five forest sites in Italy. The contribution of coarse particles deposited onto the bulk samplers was of prime importance for base cations, representing on average from 16% to 46% of the bulk deposition. The extent of this dry deposition depended on some geographical features of the sites, such as the distance from the sea and the annual rainfall. The possibility of applying specific bulk/wet ratios to estimate the wet deposition proved to be limited by the temporal variability of these ratios, which must be considered together with the spatial variability. A direct comparison of the dry contribution deriving from the bulk-wet and the throughfall-wet demonstrated that an extensive natural surface (forest canopy) performs better than a small synthetic surface (funnel of the bulk sampler) in collecting dry deposition of SO42, NO3 and Na+. The canopy exchange model was applied to both bulk and wet data to estimate the contribution of dry deposition to the total input of base cations, and the uncertainty associated to the model discussed. The exclusive use of bulk data led to a considerable underestimation of base cation dry deposition, which varies among the study sites. |
| Source | Atmospheric environment (1994) 41, pp. 745–756 |
| Keywords | Dry depositionparticlescanopyexchangeforest sites |
| Journal | Atmospheric environment (1994) |
| Editor | Pergamon., Oxford, Regno Unito |
| Year | 2007 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.atmosenv.2006.09.002 |
| Authors | Balestrini R.; Arisci S.; Brizzio M.C.; Mosello R.; Rogora M.; Tagliaferri A. |
| Text | 168772 2007 10.1016/j.atmosenv.2006.09.002 ISI Web of Science WOS 000244022900006 Dry deposition particles canopy exchange forest sites Dry deposition of particles and canopy exchange comparison of wet only, bulk and throughfall deposition in five forest sites in Italy Balestrini R.; Arisci S.; Brizzio M.C.; Mosello R.; Rogora M.; Tagliaferri A. CNR IRSA, Brugherio, Milano; CNR ISE, Agenzia Regionale per l Agricoltura e le Foreste, Milano The contribution of dry deposition to the total atmospheric input of acidifying compounds and base cations is of overwhelming importance. Throughfall measurements provide an estimate of the total deposition to forest soils, including dry deposition, but some uncertainties, related to the canopy interaction processes, affect this approach. We compared the concentrations and the fluxes of the main ions determined in wet only, bulk and throughfall samples collected at five forest sites in Italy. The contribution of coarse particles deposited onto the bulk samplers was of prime importance for base cations, representing on average from 16% to 46% of the bulk deposition. The extent of this dry deposition depended on some geographical features of the sites, such as the distance from the sea and the annual rainfall. The possibility of applying specific bulk/wet ratios to estimate the wet deposition proved to be limited by the temporal variability of these ratios, which must be considered together with the spatial variability. A direct comparison of the dry contribution deriving from the bulk wet and the throughfall wet demonstrated that an extensive natural surface forest canopy performs better than a small synthetic surface funnel of the bulk sampler in collecting dry deposition of SO42, NO3 and Na . The canopy exchange model was applied to both bulk and wet data to estimate the contribution of dry deposition to the total input of base cations, and the uncertainty associated to the model discussed. The exclusive use of bulk data led to a considerable underestimation of base cation dry deposition, which varies among the study sites. 41 http //www.sciencedirect.com/science/article/pii/S1352231006009125 Dry deposition of particles and canopy exchange Comparison of wet, bulk and throughfall deposition at five forest sites in Italy Balestrinietal_2007_AtmosphericEnvironemnt.pdf Articolo in rivista Pergamon. 1352 2310 Atmospheric environment 1994 Atmospheric environment 1994 Atmos. environ. 1994 mariacristina.brizzio BRIZZIO MARIA CRISTINA ARISCI SILVIA raffaella.balestrini BALESTRINI RAFFAELLA michela.rogora ROGORA MICHELA rosario.mosello MOSELLO ROSARIO TA.P02.014.001 Alterazioni ecosistemiche a livello funzionale e strutturale indotte da cambiamenti globali TA.P02.014.002 Impatto dei cambiamenti globali sugli ecosistemi acquatici |