Which method is used to restore degraded waterways?

Riparian restoration, which involves planting native vegetation along the banks of waterways, is an effective method for restoring degraded ecosystems. This approach focuses on rehabilitating the area around waterways, known as the riparian zone, which plays a crucial role in maintaining the health of aquatic ecosystems.

Native plants are particularly beneficial because they are well-adapted to the local environment and provide numerous ecosystem services. They help stabilize soil, reduce erosion, filter pollutants from runoff, and provide habitat for wildlife. Additionally, restoring native vegetation can enhance biodiversity and improve water quality, creating a more balanced and resilient ecosystem.

In contrast, the other methods mentioned may lead to further degradation. For example, constructing new dams can disrupt natural water flow and sediment transport, impacting aquatic habitats adversely. Introducing non-native species can lead to competition with local flora and fauna, potentially displacing native species and altering the ecosystem negatively. Reducing water levels artificially might create conditions that are not conducive to the natural function of the ecosystem, affecting both aquatic and terrestrial life negatively.

Therefore, the emphasis on riparian restoration reflects a holistic understanding of ecosystem dynamics and the specific benefits that native vegetation brings to degraded waterways.