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• W196199680 abstract "The Taupo Volcanic Zone (TVZ) is in the Waikato and the Bay of Plenty regions of North Island of New Zealand and contains many volcanic lakes of diverse history, physiography, and limnology. The lakes vary in size (0.2 to 620 km2), mixing regime (monomictic and polymictic), and trophic status (oligotrophic to supertrophic). The purpose of this study is to develop an understanding of the sediment-pore water interactions over a range of trophic conditions and how the biogeochemical cycles influence the lake ecosystem and the implications that this has for management of the TVZ lakes. The monthly changes in composition of lake water, pore water, sediments and stable isotopes of dinitrogen gas were monitored in five monomictic TVZ lakes (Taupo, Tarawera, Okataina, Rotoiti and Ngapouri) of widely varying trophic state, in order to evaluate the interaction between sediments and lake water. In particular, 15N enrichment in the benthic nepheloid layer (BNL), sediment-pore water geochemistry, the lead record in the sediment and silicon as a potential limiting nutrient for diatom growth were studied. In addition to the monthly analysis, discrete studies were extended to 9 other lakes of the Rotorua District (Te Arawa Lakes) to reinforce the findings of the monthly study. The applicability of the natural abundance of nitrogen gas isotope ratios was used to indicate the spatial distribution of nitrogen transformations in the water column and sediment pore waters of Lake Ngapouri. A method is introduced to extract gas from water samples to measure δ15N [N2] Samples were collected from the epilimnion, hypolimnion, benthic nepheloid layer and at 5 cm intervals from the sediment pore waters at monthly intervals for one year. Values of δ15N [N2] ranged from -1 to 0.28 ‰ in the epilimnion, -1.5 to 1.25 ‰ in the hypolimnion, -1.8 to 12.2 ‰ in the benthic nepheloid layer and -0.7 to 3.5‰ in sediment pore waters. Values of δ15N [N2] showed a strong seasonal pattern that was related to the loss of dissolved oxygen in the hypolimnion during seasonal stratification. Increases in 15N-enriched dinitrogen take place in the benthic nepheloid layer during the periods of anoxia (taken to be dissolved oxygen concentrations < 0.2 mg L-1) and may be related to abundant ammonium substrate (up to 3.6 mg L-1) to support denitrification. Nitrate concentrations increased up to 0.5 mg L-1 with increasing duration of anoxia. We hypothesise that an alternative electron acceptor besides oxygen is required to support the nitrification needed for the production of nitrate. Iron and manganese hydroxides and oxides from material sedimenting out of the water column may have induced chemo-nitrification sufficient to oxidize ammonium in the anoxic benthic nepheloid layer. The nitrate formed would mostly be rapidly denitrified so that the δ15N [N2] would continue to become enriched during the presence of anoxia, as observed in hypolimnion and benthic nepheloid layer of Lake Ngapouri. The changes in δ15N [N2] values indicate the potential use of isotope ratios to…" @default.
• W196199680 created "2016-06-24" @default.
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• W196199680 date "2012-01-01" @default.
• W196199680 modified "2023-09-27" @default.
• W196199680 title "Sediment-Pore Water Chemistry of Taupo Volcanic Zone Lakes and the Effect Trophic State has on Exchange with the Water Column" @default.
• W196199680 hasPublicationYear "2012" @default.
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