| Title | Stato ed evoluzione temporale della composizione chimica delle deposizioni atmosferiche nelle aree forestali della rete CONECOFOR |
| Abstract | Current state and temporal evolution of the chemical composition of atmospheric depositions in forest areas of the CONECOFOR network. Since 1997, atmospheric deposition was sampled and analyzed in the permanent plots of the Italian network for the evaluation of forest health (CONECOFOR), under the coordination of the Italian Forest Service. This paper presents the results of the activity carried out in 2009, when the EU-funded LIFE+ "FutMon" project allowed to extend the sampling network to 22 sites. Long-term trends will also be evaluated for the sampling sites with the longest time series. The sampling of open field bulk deposition was performed in a clearance close to the CONECOFOR permanent plots, while throughfall deposition and stemflow (in beech stand, only) were sampled in the plot. Deposition samples were collected weekly and sent to the laboratories, where they were analyzed for pH, conductivity, major ions, and total carbon and nitrogen. Most measured variables showed a strong geographical gradient. For example, nitrogen deposition was relatively high in the Po plain (where the emissions of nitrogen oxides and ammonia are the highest) and surrounding hills, reaching 10-20 kgN ha-1 y-1 in the open field and 13-25 kgN ha-1 y-1 in the throughfall. Sulphate deposition also showed a marked geographical gradient. Deposition of marine aerosol also had an important impact on the chemical composition of atmospheric deposition in Italy, together with the episodic deposition of Saharan dust, which showed a marked gradient, with highest values in the southernmost plots. Trend analysis was carried out on 10 sites running since the beginning of the program. A general negative trend in sulphate concentration was detected, paralleled in most plots by a positive trend in deposition pH, in good agreement with the strong reduction in the emission of sulphur dioxide recorded in the last decades. Nitrogen concentration also showed a significant decrease in some plots. The total deposition of nitrogen exceeded critical loads in seven permanent plots. |
| Source | Forest@ (Viterbo) 11, pp. 72–85 |
| Keywords | ForestsAtmospheric DepositionNitrogenTrendSulphate |
| Journal | Forest@ (Viterbo) |
| Editor | SISEF, Viterbo, Italia |
| Year | 2014 |
| Type | Articolo in rivista |
| DOI | 10.3832/efor1003-011 |
| Authors | Aldo Marchetto;, Silvia Arisci; Gabriele A Tartari; Raffaella Balestrini; Danilo Tait |
| Text | 329103 2014 10.3832/efor1003 011 Forests Atmospheric Deposition Nitrogen Trend Sulphate Stato ed evoluzione temporale della composizione chimica delle deposizioni atmosferiche nelle aree forestali della rete CONECOFOR Aldo Marchetto;, Silvia Arisci; Gabriele A Tartari; Raffaella Balestrini; Danilo Tait Aldo Marchetto 1 , Silvia Arisci 1 , Gabriele A Tartari 1 , Raffaella Balestrini 2 , Danilo Tait 3 1 CNR Istituto per lo Studio degli Ecosistemi, l.go Tonolli 50,Verbania Pallanza Italy ; 2 CNR Istituto di Ricerca sulle Acque, v. della Mornera 22, Brugherio MB Italy ; 3 APPA Bolzano, Laboratorio biologico, v. Sottomonte 2, Laives BZ Italy Current state and temporal evolution of the chemical composition of atmospheric depositions in forest areas of the CONECOFOR network. Since 1997, atmospheric deposition was sampled and analyzed in the permanent plots of the Italian network for the evaluation of forest health CONECOFOR , under the coordination of the Italian Forest Service. This paper presents the results of the activity carried out in 2009, when the EU funded LIFE FutMon project allowed to extend the sampling network to 22 sites. Long term trends will also be evaluated for the sampling sites with the longest time series. The sampling of open field bulk deposition was performed in a clearance close to the CONECOFOR permanent plots, while throughfall deposition and stemflow in beech stand, only were sampled in the plot. Deposition samples were collected weekly and sent to the laboratories, where they were analyzed for pH, conductivity, major ions, and total carbon and nitrogen. Most measured variables showed a strong geographical gradient. For example, nitrogen deposition was relatively high in the Po plain where the emissions of nitrogen oxides and ammonia are the highest and surrounding hills, reaching 10 20 kgN ha 1 y 1 in the open field and 13 25 kgN ha 1 y 1 in the throughfall. Sulphate deposition also showed a marked geographical gradient. Deposition of marine aerosol also had an important impact on the chemical composition of atmospheric deposition in Italy, together with the episodic deposition of Saharan dust, which showed a marked gradient, with highest values in the southernmost plots. Trend analysis was carried out on 10 sites running since the beginning of the program. A general negative trend in sulphate concentration was detected, paralleled in most plots by a positive trend in deposition pH, in good agreement with the strong reduction in the emission of sulphur dioxide recorded in the last decades. Nitrogen concentration also showed a significant decrease in some plots. The total deposition of nitrogen exceeded critical loads in seven permanent plots. 11 http //www.sisef.it/forest@/contents/ id=efor1003 011#tab download Articolo 2014_Foresta_11_72_85.pdf Articolo in rivista SISEF 1824 0119 Forest@ Viterbo Forest@ Viterbo Forest@ Viterbo Forest@. Viterbo Foresta Viterbo raffaella.balestrini BALESTRINI RAFFAELLA aldo.marchetto MARCHETTO ALDO gabriele.tartari TARTARI GABRIELE TA.P02.014.002 Impatto dei cambiamenti globali sugli ecosistemi acquatici |
