The scientists investigated Changdang Lake for pollution and eutrophication. They found that pollutants from sediment contribute significantly to the lake's contamination. Specifically, 16% of COD, 25% of TN, and 21% of TP pollution came from the lake bed. This input from the sediment has worsened the lake's eutrophic state. The western and southern parts are already in a troubling eutrophication status, with high levels of TN and TP in the lake's center. To combat this issue, the researchers suggested some measures to safeguard the lake's health.