Assessment andmanagement of lake eutrophication: A case study in Lake Erhai, China

Some wastewater sources, such as agricultural waste and runoff, and industrial sewage, can degrade water quality. This study summarises the sources and corresponding mechanisms that trigger eutrophication in lakes. Additionally, the trophic status index and water quality index (WQI) which are effective tools for evaluating the degree of eutrophication of lakes, have been discussed. This study also explores the main nutrients (nitrogen and phosphorus) driving transformations in the water body and sediment. Lake Erhai was used as a case study, and itwas found to be in a mesotrophic state, with N and P co-limitation before 2006, and only P limitation since 2006. Finally, effective measures to maintain sustainable development in the watershed are proposed, along with a framework for an early warning system adopting the latest technologies (geographic information systems (GIS), remote sensing (RS)) for preventing eutrophication. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

This study summarizes the sources and mechanisms that trigger eutrophication in lakes, and discusses effective tools for evaluating the degree of eutrophication. Using Lake Erhai as a case study, it was found in a mesotrophic state with N and P co-limitation before 2006, and only P limitation since then. Effective measures for maintaining sustainable development in the watershed and a framework for an early warning system utilizing GIS and RS technologies for preventing eutrophication are proposed.