Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Long term trends in Northern Italy alpine sites: deposition chemistry and surface water evolution (1997-2008) |
| Abstract | Recent trends of monthly precipitation from three monitoring sites in Lombardy region were analyzed to reveal the long term changes in chemical composition. One site is located in Val Masino-SO, in the Retic Alps, in a remote forest area at 1190 m a.s.l., while the other two sites, Moggio-LC and Giovetto-BS (1220 and 1150 m a.s.l. respectively), are closer (50 and 90 km respectively) to Milan and relatively affected by emissions from urbanized areas. Thirteen years data are available for the Val Masino site (1995-2008) and from 2000 to 2006 for the other two sites. The statistical significances of systematic changes were calculated with the Seasonal Kendall test (SKT). The precipitation total declined for all the three sites until 2007. Like in several European sites we observed a sharp decline in sulphur concentrations, and a subsequent increase of pH values. Otherwise the pattern is less clear for reduced and oxidized nitrogen. In two of the three sites no evidence on trends for nitrogen concentration is observed, while in the other one (Moggio) a weak significant increase of nitrogen and ammonium seems to occurred. Data of basic cations, bicarbonate and organic nitrogen were also analyzed showing different temporal patterns for the three sites. For the Val Masino site, trends in deposition chemistry were compared to the chemical evolution (1997-2008) of Masino stream water representing the output of the study catchment. The discharge and sulphate concentrations of the stream shows a significant decrease, while a more complex pattern is evident for nitrogen compounds closely related to snow melt and biological retention processes. A detailed data analysis shows a clear seasonal pattern of NO3 concentration in response to hydrology and biological uptake in the growing season. |
| Source | Long-term Ecosystem Research 2009 Understanding the Present to Shape the Future 15th anniversary of the Swiss Long-term Forest Ecosystem Research LWF - September 7-10, 2009, Zurich, Switzerland, September 7-10, 2009 |
| Year | 2009 |
| Type | Presentazione |
| Authors | Cristina Arese1, Raffaella Balestrini and Antonio Tagliaferri |
| Text | 269931 2009 Long term trends in Northern Italy alpine sites deposition chemistry and surface water evolution 1997 2008 Cristina Arese1, Raffaella Balestrini and Antonio Tagliaferri IRSA CNR Brugherio MB Recent trends of monthly precipitation from three monitoring sites in Lombardy region were analyzed to reveal the long term changes in chemical composition. One site is located in Val Masino SO, in the Retic Alps, in a remote forest area at 1190 m a.s.l., while the other two sites, Moggio LC and Giovetto BS 1220 and 1150 m a.s.l. respectively , are closer 50 and 90 km respectively to Milan and relatively affected by emissions from urbanized areas. Thirteen years data are available for the Val Masino site 1995 2008 and from 2000 to 2006 for the other two sites. The statistical significances of systematic changes were calculated with the Seasonal Kendall test SKT . The precipitation total declined for all the three sites until 2007. Like in several European sites we observed a sharp decline in sulphur concentrations, and a subsequent increase of pH values. Otherwise the pattern is less clear for reduced and oxidized nitrogen. In two of the three sites no evidence on trends for nitrogen concentration is observed, while in the other one Moggio a weak significant increase of nitrogen and ammonium seems to occurred. Data of basic cations, bicarbonate and organic nitrogen were also analyzed showing different temporal patterns for the three sites. For the Val Masino site, trends in deposition chemistry were compared to the chemical evolution 1997 2008 of Masino stream water representing the output of the study catchment. The discharge and sulphate concentrations of the stream shows a significant decrease, while a more complex pattern is evident for nitrogen compounds closely related to snow melt and biological retention processes. A detailed data analysis shows a clear seasonal pattern of NO3 concentration in response to hydrology and biological uptake in the growing season. Long term Ecosystem Research 2009 Understanding the Present to Shape the Future 15th anniversary of the Swiss Long term Forest Ecosystem Research LWF September 7 10, 2009 Zurich, Switzerland September 7 10, 2009 Internazionale Contributo Presentazione raffaella.balestrini BALESTRINI RAFFAELLA |