2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 3:30 PM - 3:45 PM | TESTING A MULTI-SCALE STREAM REHABILITATION TOOLBOX TO REDUCE NITRATE EXPORT IN AGRICULTURAL WATERWAYS IN CANTERBURY, NEW ZEALAND | 306A
TESTING A MULTI-SCALE STREAM REHABILITATION TOOLBOX TO REDUCE NITRATE EXPORT IN AGRICULTURAL WATERWAYS IN CANTERBURY, NEW ZEALAND
A vast network of surface- and subsurface drains supports agriculture on the Canterbury Plains, South Island, New Zealand, but, those drains act as ‘leaky plumbing’ because they often transport leeched nutrients downstream, circumventing riparian protection networks. A multi-scale spatial approach within the Canterbury Waterway Rehabilitation Experiment (CAREX) was used to quantify the export of nitrate-nitrogen in nine one-kilometer long agricultural headwaters <2 m wide to identify leaky plumbing and trial stream rehabilitation tools. In-stream nitrate-N export ranged from <1 to >50 kg/day with <0.01 to >5 kg/day coming from tile drain ‘hotspots’. Edge-of-field woodchip bioreactors and in-stream woodchip additions were trialed to reduce N export. Bioreactors reduced edge-of-field nitrate-N loss by <10 to >70%; however, in-stream additions of labile carbon are needed to address the large downstream export of nitrate-N that is not removed by edge-of-field and riparian nutrient tools. Combining nutrient removal tools in a synergistic fashion highlights the suitability a toolbox-based stream rehabilitation approach which targets multiple critical source areas of N export. Practical, cost-effective stream rehabilitation tools are recommended to address stream nutrient export while catchment-scale nutrient plans are developed to address losses from land.
- C16 Restoration Ecology
- C10 Biogeochemistry
- C10 Biogeochemistry
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Presenters/Authors
Brandon Goeller
(), University of Canterbury, bcgoeller@gmail.com;
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Catherine Febria
(), University of Windsor, Catherine.Febria@uwindsor.ca;
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Kristy Hogsden
(), NIWA, kristy.hogsden@niwa .co.nz;
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Jon Harding
(), University Canterbury, jon.harding@canterbry.ac.nz;
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Angus McIntosh
(), University of Canterbury, angus.mcintosh@canterbury.ac.nz;
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Helen Warburton
(), University of Canterbury, helen.warburton@canterbury.ac.nz;
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Hayley Devlin
(), University of Canterbury, hayley.devlin@canterbury.ac.nz;
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