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A Protocol for Collecting and Constructing Soil Core Lysimeters

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Understanding sediment nutrient cycling in a hypersaline coastal lagoon using hydrogel-based passive sampling

Jianyin Huang¹, Orlando Lam-Gordillo², Luke M Mosley³

¹Sustainable Infrastructure and Resource Management, STEM, University of South Australia, Mawson Lakes, South Australia, 5095, Australia; School of Agriculture and Food Sustainability, The University of Queensland, St Lucia, Queensland, 4072, Australia.

Marine Pollution Bulletin

|February 27, 2025

Summary

Nutrient cycling in South Australia's Coorong lagoon is poorly understood. This study found that aquatic macrophytes like Ruppia can significantly reduce sediment nutrient buildup, improving ecosystem health.

Keywords:

Aquatic macrophyte DGT and DET techniques Eutrophic Ferrous iron Nutrient cycling Sulfide

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Published on: March 24, 2023

Area of Science:

Environmental Science
Aquatic Ecology
Geochemistry

Background:

The Coorong, South Australia, is a vital hypersaline lagoon facing environmental pressures.
Limited knowledge exists on nutrient cycling and organic matter fate within this system.
Understanding these processes is critical for effective ecosystem management.

Purpose of the Study:

To investigate nutrient dynamics and sediment redox conditions in the Coorong.
To assess the influence of environmental factors like salinity, macrophytes, and microphytobenthos on nutrient cycling.
To provide insights for improving the Coorong's ecosystem health.

Main Methods:

Applied diffusive equilibrium in thin films (DET) and diffusive gradient in thin films (DGT) techniques.
Measured dissolved nutrients (ammonium, phosphate), ferrous iron, and sulfide in sediment porewaters.
Examined concentration profiles under light and dark conditions across a salinity gradient.

Main Results:

Deep South Lagoon sediments showed high ammonium, phosphate, and sulfide, indicating anoxic conditions.
Shallow sediments exhibited variable nutrient concentrations influenced by Ruppia and microphytobenthos.
Ruppia-colonized sites had significantly lower porewater ammonium, suggesting a mitigating effect.

Conclusions:

Aquatic macrophyte presence, particularly Ruppia, can reduce nutrient accumulation in Coorong sediments.
Enhancing macrophyte and macroinvertebrate biomass may improve sediment quality and nutrient cycling.
Findings offer crucial data for managing the Coorong's ecological health.