The aim of this study was to analyze the flora and species diversity of Yongheung Stream, a small stream in Korea. The stream was divided into 3 compartments for convenience. Sampling with quadrats (plots of a standard size) can be used for most plant communities. The upper region was a total of 59 taxa, including 17 families, 47 genera, 52 species, and 7 varieties. Naturalized plants were 15 species. The total transformed Braun-Blanquet value and r-NCD at middle area were 162 and 1,800.0, respectively. The middle region was a total of 59 taxa, including 17 families, 47 genera, 52 species, and 7 varieties. Naturalized plants were 15 species. The total transformed Braun-Blanquet value and r-NCD at middle area were 162 and 1,800.0, respectively. Riverbed area was dominated by the distribution of three willow species (Populus euramericana, Salix gracilistyla, and Salix koriyanagi) at middle region. The low region was a total of 55 taxa, including 16 families, 43 genera, 47 species, and eight varieties. Naturalized plants were 20 species. The total transformed Braun-Blanquet value and r-NCD at middle area were 155 and 1,755.6, respectively. Invasion of natural ecosystems by exotic plant species is recognized as a major threat to biodiversity at Yongheung Stream.
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