Invasive Plant Distribution,Harm And Risk Assessment In The Qing Yuan District,Baoding City

With the development of global economic integration,international exchange and international trade have become more frequent.alien species have been spread around the world by human activities,exacerbating the risk of the spread of alien invasive species worldwide.Alien species invasion has become an important ecological and environmental problem.Based on the field investigation of alien invasive plants in Qingyuan district,Baoding city,the risk assessment of alien invasive plants was carried out by using analytic hierarchy process(AHP),and some suggestions for the prevention and control of invasive plants were put forward to provide technical and methodological support for the further investigation and control of alien invasive plants in China.In this paper,the present situation of alien invasive plants in Qingyuan district of Baoding city was analyzed by field investigation,and a risk assessment index system suitable for local ecological environment and economic development was constructed.Analysis and evaluation of plant species,habitat,distribution,origin,invasion route,plant life form and harm were carried out.(1)In Qingyuan district,Baoding City,33 species of invasive alien plants,belonging to 24 genera and 13 families,have the ability to spread and may cause damage or influence on the ecosystem.Compositae has the largest number of invasive plants in Qingyuan District.Through the analysis of the species composition of different habitats in Qingyuan District,it is found that the distribution of invasive alien plants in Qingyuan District is mainly distributed in seven kinds of habitats: wasteland,woodland,orchard,farmland,nursery,roadside and wetland semi-natural habitat.The habitat has the highest number of invasive plant species.Through the statistics of the number of invasive species in each township in Qingyuan District,it is found that Beidian Township has the largest number of invasive species.During the field investigation,it was found that the appearance frequency of Chenopodium serotinum L.is the highest among the invasive plants in Qingyuan District.Through the analysis of the origin and introduction route of invasive plants in Qingyuan District,it was found that the number of invasive alien plant species in the Americas was the largest,and the introduction routes were mostly intentional and unintentional.The invasive plants in Qingyuan District are mainly perennial or annual herbs.(2)Use the Analytic Hierarchy Process(AHP)to comprehensively evaluate the introduction risk,biological characteristics,diffusion characteristics,invasive status,harm and impact,and control difficulty of invasive plants,and evaluate their hazard and risk levels.The evaluation system includes 6 first-level indicators and 16 second-level indicators,and each indicator is assigned a weight value.Through the assessment of invasive alien plants,its danger level is divided into 5levels.Among them,there are 2 first-class invasive plants,3 second-class invasive plants,2third-class invasive plants,8 fourth-class invasive plants,and 18 fifth-class invasive plants.It is suggested that Qingyuan District of Baoding City should establish a long-term monitoring,risk warning and emergency response mechanism for invasive alien plants,organize experts to regularly carry out census work and risk assessment of invasive alien species,strengthen the publicity of relevant laws and regulations,and focus on eradicating malignant invasive plants..(3)Through investigation,it was found that the invasive alien species,Aegilops tauschii,not only affected the harvesting process of wheat,but also had a great impact on wheat yield and processing quality.It was found that the yield loss of the wheat field with Aegilops tauschii invasion was about 12% in Qingyuan district of Baoding city.The direct economic loss of wheat by the method of market price is about 1.8349 million yuan.