The Sensitivity of Water Environmental Factors on Eutrophication Based on Rough Set Theory and the Ecological Countermeasures Revelation

The paper took advantage of approximate classification of imprecise or incomplete data to analyze and assess the sensitivity of environmental factors on eutrophication based on rough set theory. Its main advantage was it performed rationally on data attributes reduction and classification. This technique provided a valuable tool to analyze the key factors leading to eutrophication in Xiaoqing River estuary of Laizhou Bay in China. Results showed that the most important factors that dominated the eutrophic degree were aerobiotic organic compound, dissolved inorganic phosphate and nitrogen which came from the land-input of Xiaoqing River. Then the ecological measurement against eutrophication may be to cultivate a kind of ecological environment materials (e.g. seaweed) to absorb the excessive nutrition.