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Phosphorus in the Mary and vulnerability of storages to


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Presentation at "The River, the Bay and the Strait" public forum on 5 October, 2008 in Hervey Bay.

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Phosphorus in the Mary and vulnerability of storages to

  1. 1. <ul><li>Phosphorus in the Mary and vulnerability of storages to algal blooms </li></ul><ul><li>Presentation to t he River, the Bay and the Strait Forum </li></ul><ul><li>Presenter: Graeme Esslemont (Burnett Mary Regional Group) </li></ul><ul><li>Date: Wednesday 5 th October 2008 </li></ul>
  2. 2. Why I have been asked to speak today? <ul><li>Cleaner Creeks Cooperative Objectives: </li></ul><ul><li>Support stakeholders who are seeking voluntary initiatives to improve water quality in local streams (PAP 2). </li></ul><ul><li>2) Coordinated provision of reliable training and technical support, and data management (Wide Bay Water Laboratory, Burnett Mary Regional Group). </li></ul><ul><li>3) Development of a stakeholder supported dataset at an appropriate scale to identify water quality improvements. </li></ul><ul><li>Steering Meeting: Andrew Rickert, Michael Walker (WBWC), Brad Wedlock, Steve Burgess, Glenda Pickersgill, Deb Seal (MRCCC) </li></ul>
  3. 3. Events Monitoring – When sediment, nutrients & herbicides enter the river
  4. 4. Sediments - Loads
  5. 5. Tracing P in river sediments for target setting. <ul><li>Objectives </li></ul><ul><li>1) Identify variations of P in river sediments across the region, and identify sections of river with anomalous concentrations of P. </li></ul><ul><li>2) Use background ratios to as a guide for target setting , in negotiations with stakeholders for achieving on ground actions. </li></ul><ul><li>3) Suggest the application of geochemical ratios for measuring offsite exports of P from farms, to monitor against targets. This might particularly apply to stakeholders who have not embraced hydrological approaches for monitoring loads. </li></ul>
  6. 6. How does P get into sediment? <ul><li>Insoluble oxide properties. </li></ul><ul><li>Assimilated by living organisms </li></ul><ul><li>Included with soil minerals: </li></ul><ul><ul><li>Exchangeable (anion exchange with clays) </li></ul></ul><ul><ul><li>iron oxides (e.g. chemical adsorption or inclusion in gel goethite and other iron minerals) </li></ul></ul><ul><ul><li>Organic (e.g. humic acids, particulate organic matter, iron-reducing bacteria). </li></ul></ul><ul><ul><li>Mineral (apatite). </li></ul></ul>
  7. 7. Iron bound P
  8. 8. Organic bound P
  9. 9. Soil Bacteria: C/N ratio of 17-8 in fungal & bacterial biomass (Swift et al., 1979) Redfield C/N in phytoplankton = 6.6 – 7 Fine Particulate Organic Matter = 8 - 267
  10. 10. The role of carbon in Australian Rivers and Floodplains
  11. 11. Eucalyt carbon
  12. 12. Pasture carbon
  13. 13. Aquatic plant Carbon
  14. 14. Where is Phosphorus enriched in river sediment?
  15. 15. Soil loss <ul><li>Losing ground ……….. Reduced farm product-ivity </li></ul>
  16. 16. Wetlands can help…
  17. 17. Be aware of over-topping of fine sediment and soluble nutrients