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040			_aMSU _cMSU _erda
100			_aCASTALDELLI, Giuseppe
245			_aNitrogen budget in a lowland coastal area within the Po river basin (Northern Italy) _bmultiple evidences of equilibrium between sources and internal sinks
264			_aNew York _bSpringer _c2013
336			_2rdacontent _atext _btxt
337			_2rdamedia _aunmediated _bn
338			_2rdacarrier _avolume _bnc
440			_a Environmental Management _vVolume , number ,
520			_aDetailed studies on pollutants genesis, path and transformation are needed in agricultural catchments facing coastal areas. Here, loss of nutrients should be minimized in order to protect valuable aquatic ecosystems from eutrophication phenomena. A soil system N budget was calculated for a lowland coastal area, the Po di Volano basin (Po River Delta, Northern Italy), characterized by extremely flat topography and fine soil texture and bordering a network of lagoon ecosystems. Main features of this area are the scarce relevance of livestock farming, the intense agriculture, mainly sustained by chemical fertilizers, and the developed network of artificial canals with long water residence time. Average nitrogen input exceeds output terms by ~60 kg N ha−1 year−1, a relatively small amount if compared to sub-basins of the same hydrological system. Analysis of dissolved inorganic nitrogen in groundwater suggests limited vertical loss and no accumulation of this element, while a nitrogen mass balance in surface waters indicates a net and significant removal within the watershed. Our data provide multiple evidences of efficient control of the nitrogen excess in this geographical area and we speculate that denitrification in soil and in the secondary drainage system performs this ecosystemic function. Additionally, the significant difference between nitrogen input and nitrogen output loads associated to the irrigation system, which is fed by the N-rich Po River, suggests that this basin metabolizes part of the nitrogen excess produced upstream. The traditionally absent livestock farming practices and consequent low use of manure as fertilizer pose the risk of excess soil mineralization and progressive loss of denitrification capacity in this area.
650			_achemical fertilisers
650			_anitrogen uptake
650			_asoil N budget
700			_aSOANA, Elisa
700			_aRACCHETTI, Erica
700			_aPIEROBON, Enrica
700			_aMASTROCICCO, Micol
700			_aTESINI, Enrico
700			_aFANO, Elisa Anna
700			_aBARTOLI, Marco
856			_uhttps://doi.org/10.1007/s00267-013-0052-6
942			_2lcc _cJA
999			_c162406 _d162406