Spatial variability in sediment phosphorus characteristics along a hydrological gradient upstream of Lake Rotorua, New Zealand

This study examined particulate phosphorus (PP) characteristics of terrestrial, stream bed and lake bed sediments along a common hydrological pathway. The objective was to quantify spatial variability of PP in the catchment of a eutrophic lake, Rotorua (New Zealand). Median total phosphorus (TP; dry...

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Bibliographic Details
Published in:Environmental earth sciences 2015-02, Vol.73 (4), p.1573-1585
Main Authors: Peryer-Fursdon, Jamie, Abell, Jonathan M, Clarke, Dylan, Özkundakci, Deniz, Hamilton, David P, Pearson, Lisa
Format: Article
Language:English
Subjects:
Agricultural land
aluminum
bicarbonates
Biogeosciences
calcium
Creeks & streams
Earth and Environmental Science
Earth Sciences
Environmental Science and Engineering
Eutrophic lakes
Eutrophication
Geochemistry
Geology
Hydrologic analysis
Hydrology/Water Resources
Lake beds
lakes
Original Article
Overland flow
Phosphorus
Receiving waters
Sediments
Sodium hydroxide
stream channels
Streambeds
Terrestrial environments
Terrestrial Pollution
Watersheds
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Summary:This study examined particulate phosphorus (PP) characteristics of terrestrial, stream bed and lake bed sediments along a common hydrological pathway. The objective was to quantify spatial variability of PP in the catchment of a eutrophic lake, Rotorua (New Zealand). Median total phosphorus (TP; dry weight) concentration in sediments (‘terrestrial’) deposited from overland flow on farmland in the upper stream catchment was high (2,157 mg kg⁻¹), greatly exceeding that of stream bed sediments (212 mg kg⁻¹; Waiteti Stream) which exhibited downstream decline in TP concentrations. Lake bed sediments were enriched in TP (median = 2,661 mg kg⁻¹) with relatively low Fe:P and Al:P mass ratios. Sequential extraction of three PP fractions showed that the mean proportion of HCl-extracted P (Ca-bound, denoting the refractory fraction) in extracted P was higher in terrestrial sediments (17 %) than stream bed sediments (4 %). Accordingly, TP concentrations of terrestrial sediments were highly (p 
ISSN:1866-6280
1866-6299
DOI:10.1007/s12665-014-3508-y