Risk Assessment of Alien Invasive Plants in Urban Green Space in Xinluo District,Longyan
Xinluo district of Longyan city serves as the political,economic,and cultural center of the western region of Fujian.With the acceleration of urbanization and the close exchange of people and goods with surrounding cities,inva-sive plants have invaded the local area,posing a serious threat to biological safety.This study aims to assess the preva-lence of invasive alien plants in urban green spaces and evaluate the region's risk awareness and response capacity,thereby informing the development of effective management and control strategies.Field surveys,literature reviews,and the application of the quadrat method were utilized to collect information on alien invasive plants in Xinluo district and construct an invasion risk assessment system.The DPSIR model combined with the analytic hierarchy process(AHP)was employed to determine the weights of evaluation indicators,and a comprehensive assessment was conducted on the driving forces of invasion,adaptability to the local environment,distribution within the locality,impact on the local area,and response measures of the alien plants.Based on the grading standards and risk values,alien invasive plants were categorized into three invasion levels(from I to III).A total of 65 alien invasive plant species were identi-fied in the urban green spaces of Xinluo district,belonging to 22 families and 52 genera.The Asteraceae family had the highest number of species,accounting for 29.23%,followed by Amaranthaceae(12.31%)and Euphorbiaceae(9.23%).There were five life forms,with annual herbaceous plants being the most prevalent,totaling 32 species and representing 49.23%of the total.Geographically,the Americas were the primary source of these plants,with 48 species accounting for 73.85%of the total.The analysis of invasion pathways revealed that unintentionally introduced plants were the most numerous,with 35 species,constituting 53.85%of the total species count.According to the invasion status assessment results,there were 16 high-risk invasive plants(level III),18 medium-risk(level II),and 31 low-risk(level I).While there are a considerable number of alien invasive plant species in the urban green spaces of Xinluo district,the overall invasion risk level is relatively low,with most being in the medium to low risk categories(level II and III).It is rec-ommended to focus on the control and prevention of the most harmful species,such as Bidens alba and Erigeron cana-densis,based on the risk level.
invasive alien plantsurban green spaceanalytic hierarchy process(AHP)risk assessmentXinluo district
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