[Ecological security evolvement trend of drinking water source areas along Liaohe River]

Based on the investigation of potential dangerous factors for the ecological security of drinking water source areas along Liaohe River, a total of 59 drinking water source counties along the River in Liaoning Province were selected, and their ecological security evolvement trend was evaluated by using the theories of safety risk assessment and the GIS grid techniques. The results indicated that among the 59 drinking water source counties, 19 counties were in high potential danger (scores < or = 0.3), with their security status having a stronger deterioration trend, 32 counties were in medium potential danger (0.3 < scores < or = 0.7), whose security status had no obvious deterioration, and 8 counties were in low potential danger (scores > 0.7), with the security status less deteriorated. Based on the evaluation, corresponding countermeasures for ecological protection of these areas were proposed.