Relationships between land use and nitrogen and phosphorus in New Zealand lakes

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dc.contributor.authorAbell, Jonathan Michael
dc.contributor.authorÖzkundakci, Deniz
dc.contributor.authorHamilton, David P.
dc.contributor.authorMiller, Steven D.
dc.date.accessioned2011-03-20T23:36:04Z
dc.date.available2011-03-20T23:36:04Z
dc.date.issued2011
dc.description.abstractDeveloping policies to address lake eutrophication requires an understanding of the relative contribution of different nutrient sources and of how lake and catchment characteristics interact to mediate the source–receptor pathway. We analysed total nitrogen (TN) and total phosphorus (TP) data for 101 New Zealand lakes and related these to land use and edaphic sources of phosphorus (P). We then analysed a sub-sample of lakes in agricultural catchments to investigate how lake and catchment variables influence the relationship between land use and in-lake nutrients. Following correction for the effect of co-variation amongst predictor variables, high producing grassland (intensive pasture) was the best predictor of TN and TP, accounting for 38.6% and 41.0% of variation, respectively. Exotic forestry and urban area accounted for a further 18.8% and 3.6% of variation in TP and TN, respectively. Soil P (representing naturally-occurring edaphic P) was negatively correlated with TP, owing to the confounding effect of pastoral land use. Lake and catchment morphology (zmax and lake : catchment area) and catchment connectivity (lake order) mediated the relationship between intensive pasture and in-lake nutrients. Mitigating eutrophication in New Zealand lakes requires action to reduce nutrient export from intensive pasture and quantifying P export from plantation forestry requires further consideration.en_NZ
dc.format.mimetypeapplication/pdf
dc.identifier.citationAbell, J.M., Özkundakci, D., Hamilton, D.P. & Miller, S.D. (2011). Relationships between land use and nitrogen and phosphorus in New Zealand lakes. Marine & Freshwater Research, 62(2), 162-175.en_NZ
dc.identifier.doi10.1071/MF10180en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/5181
dc.language.isoen
dc.publisherCSIRO Publishingen_NZ
dc.relation.isPartOfMarine and Freshwater Researchen_NZ
dc.relation.urihttp://www.publish.csiro.au/paper/MF10180.htmen_NZ
dc.rightsThis is an author’s accepted version of an article published in the journal: Marine & Freshwater Research. © 2011 CSIRO.en_NZ
dc.subjectagricultureen_NZ
dc.subjectcatchment connectivityen_NZ
dc.subjectcatchment managementen_NZ
dc.subjecteutrophicationen_NZ
dc.subjectGISen_NZ
dc.subjectnutrientsen_NZ
dc.subjectwater qualityen_NZ
dc.subjectwatersheden_NZ
dc.titleRelationships between land use and nitrogen and phosphorus in New Zealand lakesen_NZ
dc.typeJournal Articleen_NZ
pubs.begin-page162en_NZ
pubs.elements-id35776
pubs.end-page175en_NZ
pubs.issue2en_NZ
pubs.volume62en_NZ
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