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Riparian zones are more susceptible to invasionsof alien plant species than other ecosystems. Plant invasionis determined by multiple interacting factors, such as thecharacteristics of the invasive plants, the climate, disturbancepatterns, and competition with native plants. To investigatethe multiple interactions of environmental factors with regard tothe invasion of an alien plant species, we considered a rangeof factors, including the topography, accessibility (oranthropogenic disturbances), competition with aquatic plants,and land-use history in 115 waterfront parklands along theNakdong River. The waterfront parks were constricted aftera river restoration project from 2009 to 2012. The mostcommon alien plants were Oenothera odorata, Erigeronannuus, and Coreopsis lanceolate in our study areas. Alienplant areas were negatively associated with aquatic plantareas, which indicated that dominant alien plants mainlyoccur in drier uplands in the area under study. Accessibility(or anthropogenic disturbances) to waterfront parklands hada positive effect on the proportion of alien plant species. Weassumed that frequent human visits and disturbances mayincrease the potential for invasions of diverse alien species. In addition, historic agricultural areas were positively associatedwith an invasion of an alien plants species. Our results suggestthat invasions of alien species to waterfront parklands depend onmultiple factors, including the characteristics of the alien species,the degree of accessibility, the topography, and historical landusepatterns.