Long-term dataset of annual and monthly mean trophic level index (TLI) for lakes >1 km² in the Mengxin Plateau region, 2000–2024

Dataset title:Annual and monthly mean trophic level index (TLI) for lakes >1 km² in the Mengxin Plateau region (2000–2024) Description:This dataset provides annual and monthly mean values of the trophic level index (TLI) for lakes larger than 1 km² in the Mengxin Plateau region during the period 2000–2024. The dataset was derived from [remote sensing data, field surveys, water quality monitoring, statistical analysis] and processed following standard methods of TLI calculation, integrating indicators such as total phosphorus (TP), total nitrogen (TN), chlorophyll-a (Chl-a), and Secchi depth (SD). The dataset includes: Time coverage: January 2000 – December 2024 Spatial coverage: Lakes >1 km² within the Mengxin Plateau region Variables: Lake ID, latitude, longitude, annual mean TLI, monthly mean TLI Format: CSV (tabular data), [Shapefile/GeoTIFF if you added spatial data] Value of the data: Useful for understanding long-term water quality dynamics in plateau lakes. Provides a reference for ecological monitoring, eutrophication assessment, and regional environmental management. Can be used by researchers, policymakers, and environmental managers working on water resources and ecological health.