Status And Risk Assessment Of Alien Invasive Plants In Inner Mongolia

In recent years,the taxon and quantity of alien invasive plants have been increasing in Inner Mongolia result in increasing serious harm to the local organisms and environment.Instead,the related research are very poor.In this article,based on field investigation and data reading,to master the species of alien invasive plants in Inner Mongolia and analyze their species composition,life form,origin,floristic types,habitat and place of diffusion.On this basis,the risk assessment system of alien invasive plants in Inner Mongolia is constructed by combining frequency analysis method and hierarchy analysis method,the risk grade of alien invasive plants is determined,recommendations for prevention and treatment are made.It is expected to provide basic information for prevention and management of alien invasive plants in Inner Mongolia in the future.The results are as follows:1.There were 75 alien species in Inner Mongolia,belonging to 50 genera and 20 families.Among them,11 species of monocotyledons and 64 species of dicotyledons,respectively.Asteraceae,Amaranaceae and Gramineae were more than 10 species.Amaranthus(10 species)contains the most species.According to the analysis of life form,annual herbs,biennial herbs and perennial herbs accounted for 81.3%,29.3%and 13.3% of the total species,respectively,while few arbors were found.North America(40 species)accounted for 53.3% of the total species,followed by Europe(22 species),South America(17 species)and Asia(14 species),accounting for 29.3%,22.7% and 18.7% of the total species,respectively,and Africa(2 species)accounted for 2.7% of the total species.The floristic types are mainly cosmopolitan and pantropic.The habitat is diverse,and there are more species in roadside,farmland and other habitats with greater human disturbance.It has spread to 12 cities(meng)in Inner Mongolia,among which Hohhot,Chifeng,Ordos and Hulunbuir have reached more than 30 species.2.Establish a multi-level and multi-index risk assessment system for alien invasive plants in Inner Mongolia,use frequency analysis method and analytic hierarchy process to determine the weight of each index,assign the value according to the percentage principle,and carry out risk assessment for 75 alien invasive plants in Inner Mongolia.According to the risk evaluation score,the alien invasive plants in Inner Mongolia were divided into four grades: very high risk(grade I),high risk(grade II),medium risk(grade III)and low risk(grade IV),and corresponding management strategies were put forward.Among them,Grade I includes9 species,with very high risk of invasion and easy to cause serious harm to the ecology,economy,human and animal health of Inner Mongolia.They need to be monitored,controlled and removed in time.Grade II includes 23 species,with high risk of invasion.It is easy to cause great harm after invasion through its strong propagation capacity,adaptability and reproduction capacity,and strict measures should be taken for long-term recovery and management.Grade III includes 39 species,with moderate risk of invasion,which can compete with native plants and have certain impact on biodiversity and animal husbandry,and need to be controlled to prevent them from causing harm.Grade IV includes 4species,low risk of invasion,can be scattered in the wild after escape,causing less harm,but also need to be monitored regularly to prevent widespread spread.3.At present,the number of alien invasive plant species is increasing in Inner Mongolia,the scope of invasion is expanding,and the invasion grade is generally high.It is suggested to carry out publicity and education,strengthen research,introduce species scientifically,and establish a scientific and reasonable comprehensive management system in the future.