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Unrecorded naturalized plants in Korea ( 8 )
... In biology, naturalization is any process by which a non-native organism spreads into the wild and reproduces sufficiently to maintain its population. Park (1994) reported naturalization in South Korea by 33 families, 176 species, three mutants, and two varieties (181 taxa) in a 1994 report, and by 30 families, 176 species, five mutants, and one variety (182 taxa) in a 1995 book (Park 1995); she reported 267 naturalized taxa in a second edition of the book (Park 2001), and reported 271 during a 2002 study on the distributions of naturalized alien plants in Korea (Park 2002), including 37 families, 150 genera, 254 species, 15 mutants, and two varieties (271 taxa). Recently, Lee et al. (2011) rearranged the naturalized plants of Korea as 321 taxa, including 40 families, 175 genera, 302 species, 15 mutants, and four varieties. ...
The study was conducted to analyze the effects of thinning intensity on understory vegetation in Chamaecyparis obtusa stands. The site was located on Mt Moonsu in Gochang-gun, South Korea and consisted of five treatment plots: 5 m × 5 m quadrats were installed in each plot. The total flora of the C. obtusa stand included 47 families, 60 genera, and 70 species. Three classes of floristic regional indicator plants were verified: six taxa in class I, one taxon in class II, and one taxon in class III. Also, Phytolacca americana and Robinia poseudoacacia appeared as naturalized plants in heavy thinning and control plots, respectively. Their Naturalized Index and Urbanization Index were shown as 1.00% and 0.74%, respectively. Within the treatment plots, the greatest number of species appeared in the heavily thinned plots (31 species). Chamaecyparis obtusa showed the highest dominance index of 4.67. Regarding species richness of understory vegetation, there was a very distinct difference between the thinned and non-thinned plots, whereas there was no significant differences among the treatment plots such as light thinning, normal thinning, heavy thinning, and super heavy thinning plots. Thus, understory vegetation was influenced by the presence of thinning, but not influenced by thinning intensity in this study.
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