Phosphorus in the Mary and vulnerability of storages to

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Information about Phosphorus in the Mary and vulnerability of storages to

Published on October 15, 2008

Author: greatermary

Source: slideshare.net

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

Phosphorus in the Mary and vulnerability of storages to algal blooms Presentation to t he River, the Bay and the Strait Forum Presenter: Graeme Esslemont (Burnett Mary Regional Group) Date: Wednesday 5 th October 2008

Phosphorus in the Mary and vulnerability of storages to algal blooms

Presentation to t he River, the Bay and the Strait Forum

Presenter: Graeme Esslemont (Burnett Mary Regional Group)

Date: Wednesday 5 th October 2008

Why I have been asked to speak today? Cleaner Creeks Cooperative Objectives: Support stakeholders who are seeking voluntary initiatives to improve water quality in local streams (PAP 2). 2) Coordinated provision of reliable training and technical support, and data management (Wide Bay Water Laboratory, Burnett Mary Regional Group). 3) Development of a stakeholder supported dataset at an appropriate scale to identify water quality improvements. Steering Meeting: Andrew Rickert, Michael Walker (WBWC), Brad Wedlock, Steve Burgess, Glenda Pickersgill, Deb Seal (MRCCC)

Cleaner Creeks Cooperative Objectives:

Support stakeholders who are seeking voluntary initiatives to improve water quality in local streams (PAP 2).

2) Coordinated provision of reliable training and technical support, and data management (Wide Bay Water Laboratory, Burnett Mary Regional Group).

3) Development of a stakeholder supported dataset at an appropriate scale to identify water quality improvements.

Steering Meeting: Andrew Rickert, Michael Walker (WBWC), Brad Wedlock, Steve Burgess, Glenda Pickersgill, Deb Seal (MRCCC)

Events Monitoring – When sediment, nutrients & herbicides enter the river

Sediments - Loads

Tracing P in river sediments for target setting. Objectives 1) Identify variations of P in river sediments across the region, and identify sections of river with anomalous concentrations of P. 2) Use background ratios to as a guide for target setting , in negotiations with stakeholders for achieving on ground actions. 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.

Objectives

1) Identify variations of P in river sediments across the region, and identify sections of river with anomalous concentrations of P.

2) Use background ratios to as a guide for target setting , in negotiations with stakeholders for achieving on ground actions.

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.

How does P get into sediment? Insoluble oxide properties. Assimilated by living organisms Included with soil minerals: Exchangeable (anion exchange with clays) iron oxides (e.g. chemical adsorption or inclusion in gel goethite and other iron minerals) Organic (e.g. humic acids, particulate organic matter, iron-reducing bacteria). Mineral (apatite).

Insoluble oxide properties.

Assimilated by living organisms

Included with soil minerals:

Exchangeable (anion exchange with clays)

iron oxides (e.g. chemical adsorption or inclusion in gel goethite and other iron minerals)

Organic (e.g. humic acids, particulate organic matter, iron-reducing bacteria).

Mineral (apatite).

Iron bound P

Organic bound P

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

The role of carbon in Australian Rivers and Floodplains

Eucalyt carbon

Pasture carbon

Aquatic plant Carbon

Where is Phosphorus enriched in river sediment?

Soil loss Losing ground ……….. Reduced farm product-ivity

Losing ground ……….. Reduced farm product-ivity

Wetlands can help…

Be aware of over-topping of fine sediment and soluble nutrients

 

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