• Korean Journal of Environmental Biology
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• v.37 no.2
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• pp.144-154
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• 2019

The flora of naturalized plants in historic sites, urban parks and stream of Gyeongju-si, South Korea were summarized as 84 taxa including 21 families, 59 genera, 78 species, 1 subspecies, and 5 varieties. Direct investigation was conducted in a historic site with 68 taxa, a neighborhood park with 43 taxa, a stream with 59 taxa and a small park with 42 taxa at 86 sites. Among them, 31.0% (Naturalized Degree (ND) 3) was common but not abundant, 29.8% (ND 5) was common and an abundant plant, 20.2% (ND 2) was local and not an abundant plant. 7 taxa such as Lactuca scariola, Symphyotrichum pilosum, Rumex acetosella were invasive alien species. Lactuca scariola was the most abundant with 41.9%, Symphyotrichum pilosum was more abundant around stream with 34.9%, and Rumex acetosella was abundant on historic sites or small park with 25.6% in all the surveyed sites. To prevent spread of invasive alien species, monitoring may be required, especially, in early settlement stage. A proper management plan needs to be incorporated through physical removal of those plants, substitution of soil and so on.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.22 no.2
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• pp.13-30
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• 2019

The purpose of this study was to investigate changes in vegetation and flora after five years through field surveys data with the Han Gang Watershed Management Committee (2013) data in order to observe natural vegetation changes in the riparian zone of Han River watershed. As a result, the flora of the riparian zone in 2012 were listed total 231 taxa, 66 families, 158 genus, 207 species, 23 varieties, and 1 forms, and in 2017, a total 247 taxa, 74 families, 174 genus, 218 species, 27 varieties, and 2 forms were identified. The number of rare plants decreased from 4 taxa in 2012 to 2 taxa in total in 2017, and the number of endemic plants increased from 1 taxa to 3 taxa. The number of specific plants by floral region decreased from 21 taxa (9.1% of all 231 taxa of flora) in 2012 to 16 taxa (6.5% of all 247 taxa of flora) in 2017. The total number of naturalized plants is analyzed to increase from 35 taxa, a naturalization rate of 15.15% (all 231 taxa of flora) and urbanization index of 11.2% (all 312 taxa of naturalized plants) in 2012 to 44 taxa a naturalization rate of 17.8% (all 231 taxa of flora) and urbanization index of 14.1%(all 312 taxa of naturalized plants) in 2017. The ecosystem disturbance species showed an increase in both number of species and cover degree grades, indicating that the riparian zone changed in a negative direction.

• Korean Journal of Environmental Biology
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• v.34 no.2
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• pp.63-72
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• 2016

The objective of this study was to identify the life form characteristics, naturalized degree and introduction period of naturalized plants on upland fields in South Korea. The survey sites were selected in 222 upland fields over 9 provinces where are relatively dry soil conditions and are disturbed continuously by farming practices. It seemed that these uplands maintain good condition for the invasion and settlement of alien plants. Field surveys were carried out twice from May to June and from August to September in 2013. The vascular plants of the upland fields were listed into 539 taxa which contain 103 families, 320 genera, 448 species, 2 subspecies, 74 varieties and 15 forms. Ninety nine taxa were naturalized plants composed of 23 families, 64 genera, 91 species and 8 varieties. The urbanization index and naturalized index is 30.65% and 18.37%, respectively. Among total 99 naturalized plants, Compositae (30 taxa) was the most dominant family, and followed by Gramineae (14 taxa). On the basis of dormancy form, 78 taxa were belong to Th (Therophyte). In radicoid form, $R_5$ plants (86 taxa) and $R_3$ plants (14 taxa) were dominantly distributed. In disseminule form, $D_4$ including 63 taxa and $D_2$ containing 26 taxa were dominant. On the basis of growth form, erect form (e) containing 26 taxa was dominant. In conclusion, life form spectrum was $Th-R_5-D_4-e$ type. According to life form analysis, naturalized degree and introduction period, alien plants with unique characteristics may have high ability to settle and spread nationwide after inflow into South Korea. It needs further to observe some plant species with or without ecological features such as widely disseminated seeds by wind or water, high seed productivity, long life-span seeds, high germination rate of seeds, or non-dormant germinable seed.

• Korean Journal of Plant Resources
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• v.29 no.2
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• pp.189-203
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• 2016

This study was carried out to investigate the flora of Jingangsan Mt. (Ganghwa-gun). The vascular plants identified during the 11 round field surveys were a to total of 560 taxa: 114 families, 336 genera, 495 species, 7 subspecies, 53 varieties, 4 forms and 1 hybrid. A high plant diversity were Poaceae (11.0%), Asteraceae (10.8%), Cyperaceae (8.8%), Rosaceae (4.6%) and Lamiaceae (4.3%) in regular order. The four taxa of Korean endemic plants such as Viola seoulensis Nakai, Salix koriyanagi Kimura ex Goerz, Hemerocallis hakuunensis Nakai and Polygonatum infundiflorum Y. S. Kim, B. U. Oh & C. G. Jang were collected. The vascular plants on the red list according to IUCN evaluation basis were found to be four taxa: Near Threatened (NT) species of Delphinium maackianum Regel, and Not Evaluate (NE) species of Mosla japonica (Benth. ex Oliv.) Maxim., Carex paxii Kük. and Polygonatum infundiflorum Y. S. Kim, B. U. Oh & C. G. Jang. The floristic regional indicator plants found in this area were 28 taxa comprising two taxa of degree IV, three taxa of degree III, eight taxa of degree II, and 15 taxa of degree I. In addition, the naturalized plants were identified as 44 taxa and the percentage of naturalized index (NI) was 7.9%, and Urbanization Index (UI) was 13.7%.

• Journal of the Korean Institute of Landscape Architecture
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• v.42 no.4
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• pp.48-59
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• 2014

This study was carried out to present raw data on managing the restored urban stream by studying the naturalized plants distributed in Gaeumjeong Stream, Changwon-si, Gyeongsangnam-do, Korea. The results were as follows. The numbers of naturalized plants were summarized as 45 taxa including 17 families, 36 genera, 43 species and 2 varieties. The invasive alien plants were 2 taxa including Ambrosia artemisiifolia and Lactuca sativa. The following summarizes the attributes of the naturalized plants. Most of the plants commonly originated from Europe and North America. The 5 naturalized degree that was widely distributed and had many individual was the most common. Until 1921, after the opening of 1 period was the most common in the introduced period. Section 12 had the highest NI at 41.9%, and the lowest, at 20.5%, in sections 9 and 19 were analyzed. Section 1 had the highest UI at 6.2%, whereas, the lowest, at 2.5%, was calculated in sections 19 and 20. Section 2 showed the highest DI at 16.7%. The first results of the analysis of the causes for the invasion of naturalized plants on the riverside and waterways, and physical factors and maintenance are directly affected. Second, sewage, muddy water and sediment deposits this naturalized plant caused by a chemical factor. Third, it is thought that invasive alien plants are irregular as it happens in biological factor. The proposed management plan naturalized plants, the first, disturbance caused by species management is a young object is removed immediately before flowering scape to eliminate or suppress the propagation of physical methods will be needed. Second, the fact that the national spread of native plant species and planting management does not provide space for the growth is very important. Third, agricultural land is disturbed by agricultural practices by interfering with the action of naturalized plants because the source of the river should be prohibited in agriculture. In the future, if we studied the naturalized plants distributed in restored streams located in Changwon-si, the characteristics of change in the ecosystem impact is expected to be beneficial.

• Journal of Life Science
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• v.25 no.11
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• pp.1244-1254
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• 2015

Naturalized plants were identified and recorded in Busan city based on field surveys and related literature. These plants consisted of 156 taxa in total, belonging to 31 families, 95 genera, 147 species, and 9 varieties. The Compositae had the highest diversity among 31 families, with 44 taxa, followed by Gramineae, with 24 taxa, and Leguminosae, with 10 taxa Among the plants, 68.6% (107 taxa) were annuals and biennials, and 30.1% (47 taxa) were perennials. There was one shrub (Amorpha fruticosa) and one tree (Robinia pseudoacacia). Naturalized degree 5 plants, as common and abundant plant, founded 26 taxa (96.3%) were most highly ratio from Korean naturalized plants. According to the results of the analysis based on place of origin, 50 (32.1%) taxa were from Europe, and 48 (30.8%) taxa were from North America. Epecophyten was the most common of the naturalized plants, with 123 taxa Sixty-six (42.3%) taxa were introduced during period 1, and 15 (9.6%) were introduced during period 4. Ergasiophygophyten (50.6%) and Kenophyten (32.1%) were the dominant plants in these introduction periods. In conclusion, Busan city acts as a conduit for the introduction of naturalized plants. A sustainable management and monitoring strategy may be needed to prevent the introduction and naturalization of plants.

• Journal of the Korean Institute of Traditional Landscape Architecture
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• v.42 no.2
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• pp.33-46
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• 2024

This study analyzes the planting status of alien plants in Gongsanseong, a UNESCO World Heritage Site. It provides ecological information necessary to maintain and manage traditional landscapes and environments. Vascular flora was identified as 174 taxa (88.3%) of native plants, 21 taxa (10.7%) of alien plants, and 22 taxa (11.2%) of naturalized plants among the total 197 taxa. As for rare plants, endangered species (CR) Magnolia kobus DC. appeared, accounting for 0.5% of all plant species. Endemic plants were not identified. As for the invasive alien plants, 21 taxa were identified, such as the Rumex obtusifolius L and Sicyos angulatus L. As for the degree of spread, mild spread (MS) was identified as 7 taxa (35.0%), severe spread (SS) as 2 taxa (10.0%), and extensive spread (WS) as 10 taxa (50.0%). As for naturalized plants, 22 taxa were naturalized, followed by 8 taxa of Asteraceae and 4 taxa of Fabaceae. The urbanized index was 10.7% and the naturalized plants ratio was 6.5%. The management plan is to identify the location, size and growth information of each plant species in advance through continuous monitoring using experts. It is possible to establish an annual removal project plan based on basic information on alien species.

• Journal of Environmental Impact Assessment
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• v.25 no.2
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• pp.103-123
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• 2016

This study is a comparison of the flora and case studies distributed in Gulup-do Ongjingun, Incheon. The numbers of vascular plants were summarized as 282 taxa including 81 families, 201 genera, 252 species, 3 subspecies, 22 varieties and 5 forms. The Raunkiaer life forms are analyzed in hemicryptophytes were 66 taxa (23.4%) in dormancy form, non-clonal growth ($R_5$) were 160 taxa (56.7%) in propagation form of radicoid form, having no special modification for dissemination ($D_4$) were 197 taxa (48.6%) in propagation form of disseminule form, erect form (e) were 117 taxa (41.5%) in growth form. The halophytes were 23 taxa including Salsola collina, Asparagus oligoclonos and so on. The rare plants were 7 taxa including Pyrrosia hastata (VU), Senecio nemorensis (VU) and so on. The Korean endemic plants were 5 taxa including Hepatica insularis, Lespedeza maritima and so on. In the specific plants by floristic region were 38 taxa, a degree I were 23 taxa (Dictamnus dasycarpus, Vitex rotundifolia and so on), 6 taxa of a degree II (Morus cathayana, Euphorbia esula and so on), 8 taxa of a degree III (Pyrrosia hastata, Rhodotypos scandens and so on), Senecio nemorensis of a degree V and degree IV were not found. The naturalized plants were 17 taxa including Robinia pseudoacacia, Bromus tectorumand so on. Of those Ambrosia artemisiifolia is a invasive alien plants. Naturalization rate (NR) was 6.0% of all 282 taxa of vascular plants and urbanization index (UI) was 5.3% of all 321 taxa of naturalized plants. Gulup-do and adjacent Baega-do were locally investigated field work and it summarizes the results of a total of 41 islands literature in Ongjin-gun and Ganghwa-gun, Incheon including uninhabited islands, Baengnyeong-do, Daecheong-do and so on. The average number of species were each analyzed in about 89 taxa, rare plants are about 2 taxa, endemic plants are about 1 taxa, naturalized plants are about 4 taxa. This study was the comparison of the flora and literature distribution case that the Gulup-do maintain the naturalness and continuously conducted to explore the future conservation measures the adjacent islands.

• Korean Journal of Plant Resources
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• v.19 no.2
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• pp.209-217
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• 2006

This study was carried out to investigate and analyze the vascular flora and injury status in Shinduri coastal dune area $(N36^{\circ}\;49',\;E126^{\circ}\;11')$, where designated as Natural Monuments and the result are as follows. The vascular plants identified and surveyed were 125 taxa including 108 species, 14 varieties, 2 forms and 1 hybrid of 92 genera of 40 families and there are 20 taxa including 17 species, 2 varieties and 1 hybrid of 15 genera of 10 families for woody plants, while 105 toxa including 91 species, 12 varieties and 2 forms of 78 genera of 34 families for the herbaceous plants at the . study sites. Seventeen taxa including 17 species of 15 genera of 9 families were investigated for naturalized plants and ratio of naturalization was 13.6 percents at the study sites. Glehnia littorolis Fr. Schm. and Lilium callosum S. et Z. appeared as rare and endangered plants designated in Korea Forest Service. Nine taxa in degree 1, 2 taxa in degree 2, 4 taxa in degree 3, 2 taxa in degree 4 and 2 taxa in degree 5 were represented for especialized species.

• Journal of Environmental Science International
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• v.12 no.6
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• pp.573-582
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• 2003

According to the survey map, the altitudes of up and down the Ansungchon were 242m and 49m accordingly. The width of the river was 4m at upperstream and became wider, lam at midstream and 114m at downstream. Water pH of the Ansungchon was measured variously in the range of 6.0-7.9 according to the surveyed times and areas. The water pH measured during June through August decreased continually and suddenly increased at the end of October. Phragmites iaponica, a major species of the fresh water emergent anchored hydrophytes, was surveyed mostly in the area of upperstream, Phragmites communis, Miscanthus sacchariflorus and Typha orientalis were surveyed in the areas of midstream and downstream, and Zizania latifolia was found in all areas of the river. The total of 101 taxa dividing into 32 families, 71 genera, 88 species, and 13 varieties have been inhabited in these areas. Among the inhabited plants, Poaceae was 21.8%, which appeared in the highest percent. Compositae was 20.8%, and Polygonaceae was 11.9%. In the surveyed areas, herbaceous plants were 95.1% and mostly occupied, and woody plants were 4.9％. Among the herbaceous plants, perennial plants were 52.5%, and annual and biannual plants were 28.7% and 13.9% accordingly. Naturalized plants dividing into 8 families and 18 genera have been found in the surveyed areas. The number of the naturalized plants increased from upperstream to downstream as the environmental disruption became worse. Only 2.5% of the total naturalized plants were appeared in up, 17.7% in midstream, and 28.6% in downstream. Shannon-Weiner's index for the degree of diversity was 2.898-3.666 in the area of upperstream, but 3.708-4.135 in downstream, which was little higher.