Research Of Risk Assessment Of Alien Invasive Species Based On Fuzzy Theory

Invasion of alien species is a hotspot of interdisciplinary research in the21st century, during Biology, Ecology, Environmental studies, Sociology, Economics and so on. Invasion of alien species has brought the world of natural resources and the human society great influence and harm. It has many good advantages to study the risk assessment of alien biological invasion, such as reducing the speed of the invasion of alien invasive species, improving the international tensions of biological invasion and guaranteeing the steady development of human society. In order to realize the effectiveness of the risk assessment, this research adopts The Fuzzy theory to probe into the risk based on the alien invasive species characteristic analysis of uncertainty、fuzziness and predictability and the quantitative requirements of the content of The risk assessment. This paper empirically research on the risk of alien invasive species based on The Fuzzy theory by using literature analysis、theoretical research, consulting, hierarchy analysis and the methods of group decision-making.1:On the basis of a series of research and analysis, including invasion situation of alien invasion species、invasion characteristics and the research situation of progress and existing problem on risk assessment at home and abroad, determines the research contents and purpose and meanings.2:Based on the comprehensive studies of combining The Fuzzy theory and the theory of alien invasion species and Index factors constructing principles of alien species, this paper adopts the Fuzzy analytic hierarchy process constructing the index evaluation system of alien species.3:According to the weight design principles of expert, this paper accomplishes effectively the weight set by applying the method of Fuzzy group decision-making.4:This paper, taking the risk assessment of Eichhornia crassipes in LiuYang for example, analyzes the harm level of Index factors s.