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http://dx.doi.org/10.17820/eri.2020.7.3.145

Distribution Characteristics of Alien Plants by Wetland Types in the Ecologically Outstanding Wetlands of South Korea  

Chu, Yeounsu (Wetlands Research Team, National Institute of Ecology)
Cho, Kwang-Jin (Wetlands Research Team, National Institute of Ecology)
Kim, Mijeong (Wetlands Research Team, National Institute of Ecology)
Lee, Changsu (Wetlands Research Team, National Institute of Ecology)
Yoon, Jungdo (Wetlands Research Team, National Institute of Ecology)
Lim, Jeoncheol (Wetlands Research Team, National Institute of Ecology)
Publication Information
Ecology and Resilient Infrastructure / v.7, no.3, 2020 , pp. 145-159 More about this Journal
Abstract
Wetlands are vulnerable to biological invasion by alien species, because they function as sinks that accumulate excess water, sediments, nutrients, and other contaminants from the surrounding watersheds by disturbance. In this study, to understand the status and characteristics of the alien plants based on the type of wetlands, we classified 24 ecologically outstanding wetlands and analyzed the status of alien flora. A total of 130 alien plants were found in the wetlands, accounting for 11% of the total plant species. Among them, the Asteraceae species was the most diverse, with 40 species. Erigeron annuus and Oenothera ordorata had the highest frequency of occurrence. The species richness of alien plants in the riverine and lacustrine wetlands (average: 30 species) was higher than that in the mountainous palustrine wetlands (average: 10 species). The same results were found in the naturalization index, urbanization index, and ratio of annuals and biennials, which indicate the degree of artificial interference. In the cluster analysis, the riverine and lacustrine wetlands were combined, and only the mountainous palustrine wetlands were separated. The number of alien plants is remarkably low in the mountainous palustrine wetlands, and it is considered to be the influence of Erigeron strigosus, Symphytum officinale, and Bilderdykia convolvulus, not found in the other types of wetlands. In particular, invasive alien plants such as Aster pilosus, Ambrosia trifida, Sicyos angulatus, Ambrosia artemisiifolia var. elatior were found intensively in the riverine wetlands. Therefore, it is considered that a methodical management is urgently required considering the dispersal of alien plants in the riverine and lacustrine wetlands with high artificial interference.
Keywords
Alien plant; Ecologically outstanding wetland; Intensive survey on national inland wetalnds; Wetland type;
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