Human impact on current environmental state in Chinese lakes

Area of Science:

• Environmental Science
• Ecology
• Limnology

Background:

• Inland aquatic ecosystems face diverse anthropogenic and natural disturbances, with spatial variations often poorly quantified.
• Understanding environmental factors driving lake water quality and trophic status is crucial for ecological integrity.

Purpose of the Study:

• To investigate the environmental factors influencing spatial variability in water quality and trophic status across Chinese lakes.
• To assess the relationship between human modification and lake trophic status and analyze environmental factor networks.

Main Methods:

• Studied 217 lakes across five regions in China.
• Correlated human modification index in terrestrial systems (HMT) with lake trophic status index (TSI).
• Analyzed environmental factor networks (EF networks) for freshwater and saline lakes.

Main Results:

• A significant correlation was found between HMT and TSI, with regional variations noted, particularly on the Qinghai-Tibet Plateau.
• EF networks differed between freshwater and saline lakes; freshwater lakes in less-impacted areas showed complex networks, while human influence simplified them.
• Saline lakes exhibited correlations between water salinity and organic carbon/nitrogen forms.

Conclusions:

• HMT and EF networks serve as valuable indicators of lake ecological integrity.
• Large-scale spatial data integration aids conservation planners in assessing risks to inland aquatic systems.