Frequency Distribution Approach for Deriving Ecological Criteria for Liao River and Tai Lake in China

摘要

According to the frequency distribution approach of Nutrition Criteria Technical Guidance Manual of U.S. EPA, we calculated eco-criteria of Tai Lake and Liao River in China by observing data. The results show that: 1. Phytoplankton H is 2.81, phytoplankton D is 2.03, zooplankton H is 3.16 and zooplankton D is 7.70 in Tai Lake. 2. Phytoplankton H is 3.04, phytoplankton D is 2.66, the zooplankton H is 3.46 and zooplankton D is 5.15 in Liao River. The results show that the eco-criteria by frequency distribution approach is feasible and correct.