Constructed wetlands with invasive plants like Phragmites australis and Typha angustifolia can change ecosystem function. Researchers studied how these plants affect nitrate removal in wetland sediments. They found that nitrate removal rates were similar across all treatments. Phragmites australis had higher sediment density and organic matter, while Typha angustifolia and barren sediments were similar. In environments with high nitrate levels, plant roots may not provide enough carbon for nitrate removal. This buildup of organic matter likely drives nitrate removal in wetland sediments.