Abstract
This contribution was preliminarily presented with an oral communication during the “Water Day 2015” conference organized in Rome the 20th of March 2015 by the Accademia Nazionale dei Lincei. It implements a recent paper that studied the Po river water from the Alpine springs toward the Adriatic Sea (Marchina et al. Environ Sci Pollut Res 22, 5184–5203, 2015), specifically focussing on its deltaic part. The new geochemical analyses are useful to evaluate the extent of salinization (due to mixing with sea-water) and to monitor the flux of nutrients that are conveyed by the river toward the coastal environment. The paper also contains oxygen/hydrogen water isotopes that represent a snapshot of the current climatic conditions to be compared with the literature data and with the future composition to set up a hydro-archive that should be updated to evaluate on-going climatic changes. Moreover, the paper reports preliminary nitrogen isotopes composition of Po river water that trace the impact of human activities, to be monitored in the future to understand possible on-going pollutions. We conclude that geochemical researches on Po river should consider with particular attention the delta because it is an extremely fragile ecosystem where biogeochemical variations are more relevant.
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References
Bartoli M, Racchetti E, Delconte CA, Sacchi E, Soana E, Laini A, Longhi D, Viaroli P (2012) Nitrogen balance and fate in a heavily impacted watershed (Oglio River, Northern Italy): in quest of the missing sources and sinks. Biogeosciences 9:361–373
Bianchini G, Pennisi M, Muti A, Cerbai N, Kloppmann W (2005) Hydrochemistry of the Cornia alluvial aquifer (Tuscany, Italy): impact of hydrothermal fluids, seawater intrusion and water-sediment interaction. Geothermics 34:297–319
Casciotti KL, Sigman DM, Galanter HM, Böhlke JK, Hilkert A (2002) Measurement of the oxygen isotopic composition of nitrate in seawater and freshwater using the denitrifier method. Anal Chem 74:4905–4912
Clark ID, Fritz P (1997) Environmental isotopes in hydrogeology. Lewis Publishers, New York
Craig H (1961) Isotopic variations in meteoric waters. Science 133:1702–1703
De Gobbis D, Gilmartin M (1990) Nitrogen, phosphorous and biogenic silicon budgets for the northern Adriatic Sea. Oceanol Acta 13:31–45
Fossato Vu (1971) Ricerche idrologiche e chimico-fisiche sul fiume Po a Polesella. Arch Oceanogr Limnol 17:125–139
Gherardelli L, Canali L (1960) Indagine sulle caratteristiche chimiche e chimico-fisiche delle acque del Po a Polesella, con ricerca delle sostanze disciolte mediante analisi chimiche quantitative e spettrografiche semi-quantitative. Giornale del Genio Civile, Fascicolo, p 11
Longinelli A, Selmo E (2003) Isotopic composition of precipitation in Italy: a first overall map. J Hydrol 270:75–88
Ludwig W, Dumont E, Meybeck M, Heussner S (2009) River discharges of water and nutrients to the Mediterranean and Black Sea: major drivers for ecosystem changes during past and future decades? Prog Oceanogr 80:199–217
Marchetti R, Provini A, Crosa G (1989) Nutrient load carried by the River Po into the Adriatic Sea, 1968–1987. Mar Pollut Bull 20:168–172
Marchina C, Bianchini G, Natali C, Pennisi M, Colombani N, Tassinari R, Knöller K (2015) The Po river water from the Alps to the Adriatic Sea (Italy): new insights from geochemical and isotopic (δ18O–δD) data. Environ Sci Pollut Res 22:5184–5203
Naldi M, Pierobon E, Tornatore F, Viaroli P (2010) Il ruolo degli eventi di piena nella formazione e distribuzione temporale dei carichi di fosforo e azoto nel fiume Po. Biol Ambient 24:59–69
Natali C, Bianchini G (2015) Thermally based isotopic speciation of carbon in complex matrices: a tool for environmental investigation. Environ Sci Pollut Res 22:12162–12173
Sacchi E, Acutis M, Bartoli M, Brenna S, Delconte CA, Laini A, Pennisi M (2013) Origin and fate of nitrates in groundwater from the central Po plain: insights from isotopic investigations. Appl Geochem 34:164–180
Sigman DM, Casciotti KL, Andreani M, Barford C, Galanter M, Böhlke JK (2001) A bacterial method for the nitrogen isotopic analysis of nitrate in seawater and freshwater. Anal Chem 73:4145–4153
Ventura M, Scandellari F, Ventura F, Guzzon B, Rossi Pisa P, Tagliavini M (2008) Nitrogen balance and losses through drainage waters in an agricultural watershed of the Po Valley (Italy). Eur J Agron 22:108–115
Zonneveld KAF, Chen L, Elshanawany R, Fisher HW, Hoins M, Ibrahim MI, Pittauerova D, Versteegh GJM (2012) The use of dinoflagellate cysts to separate human-induced from natural variability in the trophic state of the Po River discharge plume over the last two centuries. Mar Pollut Bull 64:114–132
Zuppi GM, Sacchi E (2004) Hydrogeology as a climate recorder: Sahara-Sahel (North Africa) and the Po Plain (Northern Italy). Glob Planet Change 40:79–91
Acknowledgments
The authors gratefully acknowledge the anonymous referees and the editor for their constructive comments that helped to improve earlier versions of the manuscript. The study was funded in part by the European Fund of Regional Development (POR FESR 2007–2013), Terra&AcquaTech Labs., Technopole of Ferrara.
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Marchina, C., Bianchini, G., Natali, C. et al. Geochemical and isotopic analyses on the Po delta water: insights to understand a complex riverine ecosystem. Rend. Fis. Acc. Lincei 27, 83–88 (2016). https://doi.org/10.1007/s12210-015-0465-7
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DOI: https://doi.org/10.1007/s12210-015-0465-7