Occurrence, Inputs and Potential Effects of Nutrients in Franklin District Streams

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dc.contributor.advisor Perry, G en
dc.contributor.advisor Webster-Brown, J en
dc.contributor.author Takimoana Lironi, EJ en
dc.date.accessioned 2011-02-23T21:41:42Z en
dc.date.issued 2011 en
dc.identifier.uri http://hdl.handle.net/2292/6415 en
dc.description Full text is available to authenticated members of The University of Auckland only. en
dc.description.abstract Across the Auckland region, a general trend in decreasing nitrate concentrations is evident in Auckland Council monitoring data. However, Ngakaroa stream located in Franklin district has not been exhibiting this trend, instead increasing nitrate concentrations have been observed since monitoring began in 1993. To further understand this development, two sites (located on Whangamarie and Waitangi streams) were added in 2009. As this district has strong horticultural activity that has resulted in nitrate infiltrating into the districts upper aquifers, it is hypothesised that this nitrate enriched groundwater is ultimately making its way into the local surface water systems where it is affecting the stream water quality. This thesis aimed to determine if this transfer from groundwater to surface water is occurring and is the cause of the high nitrate concentrations observed in Franklin district streams. To achieve these aims past and present plant nutrient (nitrate and phosphate) concentrations were indentified in representative streams located within Franklin district. These nutrient concentrations were then correlated with groundwater input into these streams. This research found strong links between groundwater input and nitrate (but not phosphate) concentrations in streams. Whangamarie, Hingaia Trib, Hingaia Lower, Whangamarie DS and Whangapouri were found to have high/moderate groundwater input and exhibited the highest nitrate concentrations observed. The lack of correlation between groundwater input and phosphate was expected, as phosphate does not leach into groundwater, instead it readily binds to sediment and is transported into streams via surface runoff. These two different transport pathways identify the need for two management approaches; strategies to limit phosphate inputs need to occur in the short-term, while long-term measures need to focus on minimising nitrate infiltration into the districts groundwater systems. Both of these management strategies are essential if prevention of further degradation of Franklin district streams is to occur. en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof Masters Thesis - University of Auckland en
dc.relation.isreferencedby UoA99215447114002091 en
dc.rights Restricted Item. Available to authenticated members of The University of Auckland. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Occurrence, Inputs and Potential Effects of Nutrients in Franklin District Streams en
dc.type Thesis en
thesis.degree.discipline Environmental Science en
thesis.degree.grantor The University of Auckland en
thesis.degree.level Masters en
dc.rights.holder Copyright: the author en
pubs.author-url http://hdl.handle.net/2292/6415 en
pubs.elements-id 206469 en
pubs.record-created-at-source-date 2011-02-24 en

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