Wetlands as a potential multifunctioning tool to mitigate eutrophication and brownification

Area of Science:

• Environmental Science
• Ecology
• Water Resource Management

Background:

• Eutrophication and brownification are significant environmental issues impacting aquatic ecosystems.
• Anthropogenic activities increase nutrient and total organic carbon (TOC) loads, altering water quality.
• Existing research on wetland capabilities primarily focuses on nutrient reduction, with limited data on TOC and water color mitigation.

Purpose of the Study:

• To evaluate the multifunctional potential of wetlands in mitigating both eutrophication and brownification.
• To assess the reduction efficiencies of wetlands for total nitrogen (TN), total phosphorus (TP), TOC, and water color.
• To compare the performance of generalist wetlands (reducing all parameters) versus specialist wetlands (reducing fewer parameters).

Main Methods:

• A 18-month study was conducted across nine diverse wetland ecosystems.
• Concentrations of TN, TP, TOC, and water color were monitored to quantify reduction efficiencies.
• Seasonal variations in wetland performance were analyzed, comparing summer and winter efficiencies.

Main Results:

• Wetlands demonstrated varying efficiencies in reducing TN, TP, TOC, and water color, with higher performance generally observed during summer.
• Some wetlands effectively reduced all four parameters simultaneously, acting as multifunctional mitigation tools.
• Generalist wetlands showed lower efficiency for individual parameters compared to specialist wetlands that targeted one or two parameters.

Conclusions:

• Wetlands can serve as multifunctional tools to combat both eutrophication and brownification in aquatic systems.
• The design of generalist wetlands requires further investigation to optimize their mitigation capacity.
• Utilizing a series of specialist wetlands within a catchment may offer an alternative strategy for comprehensive water quality improvement.