{Reference Type}: Journal Article
{Title}: Eutrophication evolution of lakes in China: Four decades of observations from space.
{Author}: Hu M;Ma R;Xue K;Cao Z;Xiong J;Loiselle SA;Shen M;Hou X;
{Journal}: J Hazard Mater
{Volume}: 470
{Issue}: 0
{Year}: 2024 May 15
{Factor}: 14.224
{DOI}: 10.1016/j.jhazmat.2024.134225
{Abstract}: The lake eutrophication is highly variable in both time and location, and greatly restricts the sustainable development of water resources. The lack of national eutrophication evaluation for multi-scale lakes limits the pertinent governance and sustainable management of water quality. In this study, a remote sensing approach was developed to capture 40-year dynamics of trophic state index (TSI) for nationwide lakes in China. 32% of lakes (N = 1925) in China were eutrophic and 26% were oligotrophic, and a longitudinal pattern was discovered, with the 40-year average TSI of 62.26 in the eastern plain compared to 23.72 in the Tibetan Plateau. A decreasing trend was further observed in the past four decades with a correlation of -0.16, which was mainly discovered in the Tibetan Plateau lakes (r > -0.90, p < 0.01). The contribution of climate change and human activities was quantified and varied between lake zones, with anthropogenic factors playing a dominant role in the east plain lakes (88%, N = 473) and large lakes are subject to a more complex driving mechanism (≥ 3 driving factors). The study expands the spatiotemporal scale for eutrophication monitoring and provides an important base for strengthening lake management and ecological services.