Extreme Drought Threatens Humanity: Research Reveals Devastating Effects on China's Largest Freshwater Lake

Strategic Insights -

Prolonged and extreme droughts pose a significant threat to humanity, with severe impacts on human life, the aquatic environment, and freshwater resources. A recent study published in the Geoscience Frontiers journal examined the effects of the 2022 global drought on China's largest freshwater lake, Poyang Lake. The research, conducted by investigators from Tongji University, highlighted significant differences in water resources and quality between common and extreme drought conditions.

Key Takeaways:

  • The 2022 global drought was the worst in recent years, with a precipitation deficit and abnormal high temperatures, profoundly affecting human life and the aquatic environment.
  • The study selected Poyang Lake as the research object and investigated the lake's water area, quantity, morphology, and water quality in 2018 (normal season) and 2022 (extreme drought period).
  • Results showed that standardized precipitation index (SPI), standardized runoff index (SRI), and standardized precipitation-evapotranspiration index (SPEI) reached moderate to severe drought in the summer of 2022.
  • From 2018 to 2022, lake water area decreased by 1789.62 km^2, water quantity reduced by 15.40 x 10^9 m^3, and lake shoreline decreased by 2923.70 km.
  • The shoreline development index, size ratio, and energy factor decreased by 4.87, 198.53 m, and 963.60, respectively, while the dynamic ratio, relative depth, and Schindler's ratio increased by 1457.10, 0.04 m, and 13.48 m^-1, respectively.
  • The water chemical indicators varied significantly in two years, and the water hydrochemical types changed from SO4-Cl-Ca-Mg type and HCO3-Ca-Mg type to SO4-Cl-Ca-Mg type from 2018 to 2022.

Statistics:

  • 1789.62 km^2: decrease in lake water area from 2018 to 2022.
  • 15.40 x 10^9 m^3: reduction in water quantity from 2018 to 2022.
  • 2923.70 km: decrease in lake shoreline from 2018 to 2022.
  • 4.87, 198.53 m, and 963.60: decreases in shoreline development index, size ratio, and energy factor, respectively.
  • 1457.10, 0.04 m, and 13.48 m^-1: increases in dynamic ratio, relative depth, and Schindler's ratio, respectively.

Sources:

  • NewsRx. Researchers from Tongji University Detail New Studies and Findings in the Area of Geoscience (Extreme Drought Affects Lake Water Quality, Quantity, Morphometry: Evidence From China's Largest Fresh Water Lake Under the 2022 Global Drought). China Weekly News. November 4, 2025; p 404.
  • Geoscience Frontiers. Extreme Drought Affects Lake Water Quality, Quantity, Morphometry: Evidence From China's Largest Fresh Water Lake Under the 2022 Global Drought. 2025;16(6).