Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | A reversal in NO3 trends for lakes and rivers in Northern Italy: towards a recovery from N saturation? |
| Abstract | Long-term studies on the chemistry of atmospheric deposition and surface waters have been performed in North-Western Italy since the 1970s. Deposition of inorganic N in this area is around 20-25 kg N ha-1 y-1, and has remained fairly constant in the last 30 years. This huge flux of N caused N-saturation of terrestrial catchments and increasing levels of NO3 in rivers and lakes. Recently, monitoring data for both rivers and lakes showed a reversal in NO3 Methods/Approach trends: concentrations started to decrease, with a change-point around 2003-2004 at several sites. This change was widespread, affecting both high altitude lakes in the Alps and subalpine lakes and rivers. Atmospheric input of N also showed a recent change, with a slight tendency to decrease, mainly due to the limited precipitation amount occurred between 2003 and 2009. Surface water may be responding to these changing N input, but possible climate change effects, as a higher N uptake in soil and water under a warmer climate, should also be taken into account. |
| Source | Nitrogen and global change - key findings, future challenges., Edimburgo, Scozia, 11-14 aprile 2011 |
| Keywords | NitrogenLong term trendsAtmospheric deposition |
| Year | 2011 |
| Type | Abstract in atti di convegno |
| Authors | Rogora, Michela; Arisci, Silvia; Marchetto, Aldo |
| Text | 206070 2011 PUMA cnr.ise/2011 A6 008 Nitrogen Long term trends Atmospheric deposition A reversal in NO3 trends for lakes and rivers in Northern Italy towards a recovery from N saturation Rogora, Michela; Arisci, Silvia; Marchetto, Aldo CNR ISE, Pallanza Verbania Centre for Ecology Hydrology CEH ID PUMA cnr.ise/2011 A6 008 Nitrogen and global change key findings, future challenges. Edimburgo, Scozia 11 14 aprile 2011 Internazionale Long term studies on the chemistry of atmospheric deposition and surface waters have been performed in North Western Italy since the 1970s. Deposition of inorganic N in this area is around 20 25 kg N ha 1 y 1, and has remained fairly constant in the last 30 years. This huge flux of N caused N saturation of terrestrial catchments and increasing levels of NO3 in rivers and lakes. Recently, monitoring data for both rivers and lakes showed a reversal in NO3 Methods/Approach trends concentrations started to decrease, with a change point around 2003 2004 at several sites. This change was widespread, affecting both high altitude lakes in the Alps and subalpine lakes and rivers. Atmospheric input of N also showed a recent change, with a slight tendency to decrease, mainly due to the limited precipitation amount occurred between 2003 and 2009. Surface water may be responding to these changing N input, but possible climate change effects, as a higher N uptake in soil and water under a warmer climate, should also be taken into account. A reversal in NO 3 trends for lakes and rivers in Northern Italy S3_Rogora.pdf Abstract in atti di convegno ARISCI SILVIA aldo.marchetto MARCHETTO ALDO michela.rogora ROGORA MICHELA TA.P02.014.002 Impatto dei cambiamenti globali sugli ecosistemi acquatici |