Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Modellizzazione del comportamento dell'azoto nei bacini fluviali selezionati |
| Keywords | Nitrogen; Lakes; Rivers |
| Year | 2012 |
| Type | Rapporto di ricerca (Research report) |
| Authors | Aldo Marchetto; Ombretta Tornimbeni; Michela Rogora; Marzia Ciampittiello |
| Text | 329231 2012 Nitrogen; Lakes; Rivers Modellizzazione del comportamento dell azoto nei bacini fluviali selezionati Aldo Marchetto; Ombretta Tornimbeni; Michela Rogora; Marzia Ciampittiello CNR ISE This deliverable aims to the quantification of the amount of nitrogen compounds reaching the InHabit lakes from atmospheric deposition. In effect, nitrogen is one of a number of pollutants that can reach lake water through atmospheric dry or wet deposition, escaping from the conceptual pattern of the Water Framework Directive, which assumes that pollutants will reach the waterbodies along watercourses within the River Basins. We estimated the atmospheric load of total nitrogen, both in the oxidized nitrate and the reduced ammonium forms, using the results of monitoring sites in the InHabit regions, as well as using the results of the EMEP model, which estimates pollutant depositions using emission inventories and dispersal modeling. Part of the deposition directly affects lake surface, while another part reaches its catchment area, interacting with soils and is generally taken up by forested soils. We modeled nitrogen retention using a recently published empirical model and we confirmed its results using both a steady state mass balance model and an estimation of the nitrogen saturation of soils using a 4 stage descriptive model. Finally we compared direct input of nitrogen form agricultural, zootechnical and point sources with the estimated input from atmospheric deposition, and we found that for large, impacted reservoirs, as some of those selected in Sardinia, the atmospheric contribution to nitrogen load was negligible. On the contrary, in lakes less affected by direct input, such as Lake Mergozzo Piedmont region and Baratz Sardinia region , atmospheric input may represent more than 90% of the total nitrogen load, and ranging between 43 and 72% for some other lakes and reservoirs. These results shows that a particular attention should be paid to the ecological response of the biological communities to nitrogen enrichment, as lakes considered as reference sites because of the low anthropogenic disturbance, may have been N enriched, and their biological communities may be different from reference conditions . If this is the case, the subsequent estimation of the ecological quality ratios EQRs , may be altered. Deliverable del progetto INHABIT Local hydro morphology, habitat and RBMPs new measures to improve ecological quality in South European rivers and lakes Deliverable 2012_Deliverable_I2d6_INHABIT.pdf Rapporto di ricerca Research report aldo.marchetto MARCHETTO ALDO marzia.ciampittiello CIAMPITTIELLO MARZIA michela.rogora ROGORA MICHELA TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |