dc.contributor.author | Wright, R. | nb_NO |
dc.contributor.author | Raastad, I.A. | nb_NO |
dc.contributor.author | Kaste, Ø. | nb_NO |
dc.contributor.other | Wright, R. - Project manager | nb_NO |
dc.date.accessioned | 2014-08-01T10:40:26Z | |
dc.date.available | 2014-08-01T10:40:26Z | |
dc.date.issued | 1997 | nb_NO |
dc.identifier | 3592 | nb_NO |
dc.identifier.isbn | 82-577-3145-5 | nb_NO |
dc.identifier.issn | 1894-7948 | nb_NO |
dc.identifier.uri | http://hdl.handle.net/11250/209194 | |
dc.description.abstract | Here we test the hypothesis that increased deposition of inorganic N compounds leads to increased leachingand runoff of organic N and thus a higher critical load. We use mainly Norwegian data from input-output fluxes at small catchments, national lake surveys, and large-scale experiments with N deposition to whole catchments. Concentrations of organic-N are not significantly related to N deposition. Much of the variance in organic-N levels are explained by TOC concentrations. For the small catchments, there is a significant relationship between C/N ratio in dissolved organic matter and the N deposition. The sites with high N deposition have low C/N ratio. Chronically high N deposition and long-term accumulation of N in soils and biomass may have led to organic matter more enriched in N relative to prestine sites. Time trend data from manipulated catchments do not show changes in organic-N leaching over 4-10 years. Although organic N levels may have increased as a result of N deposition, the resultant effect on estimate of critical load for nitrogen for freshwaters is minor. For practical purposes organic N outputs can be neglected in estimating and mapping critical loads for nitrogen in Norway. | nb_NO |
dc.description.sponsorship | Direktoratet for naturforvaltning (DN) Miljøverndepartementet (MD) | nb_NO |
dc.publisher | Norsk institutt for vannforskning | nb_NO |
dc.relation.ispartofseries | NIVA-rapport;3592 | nb_NO |
dc.relation.ispartofseries | Naturens tålegrenser fagrapport;83 | nb_NO |
dc.rights | Navngivelse-IkkeKommersiell-DelPåSammeVilkår 3.0 Norge | nb_NO |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-sa/3.0/no/ | nb_NO |
dc.subject | sur nedbør | nb_NO |
dc.title | Atmospheric deposition of nitrogen, runoff of organic nitrogen, and critical loads for soils and waters | nb_NO |
dc.type | Research report | nb_NO |
dc.rights.holder | Norsk institutt for vannforskning/Norwegian institute for water research | nb_NO |
dc.subject.nsi | VDP::Matematikk og naturvitenskap: 400 | nb_NO |
dc.source.pagenumber | 23 | nb_NO |
dc.subject.keyword | tålegrense | nb_NO |
dc.subject.keyword | nitrogen (total) | nb_NO |
dc.subject.keyword | jord | nb_NO |
dc.subject.keyword | vann | nb_NO |
dc.subject.keyword | critical | nb_NO |
dc.subject.keyword | loads | nb_NO |
dc.subject.keyword | nitrogen | nb_NO |
dc.subject.keyword | water | nb_NO |
dc.subject.keyword | soil | nb_NO |
dc.relation.project | O-96207 | nb_NO |