Analysis of the Difference and Correlation by Altitude in the Species Number of Vascular Plants and Naturalized Plants in Korea

Hyangju Lee,Changjun Kim,Wonhyeon Lim J-INSTITUTE 2022 International Journal of Crisis & Safety Vol.7 No.2

Purpose: By analyzing 1,441 flora survey data of the 3rd to 5th data of the National Natural Environ-ment Survey, the differences by region and altitude were analyzed in the species number of vascular plants and naturalized plants distributed throughout Korea, and the naturalization index. This study aimed to reveal the correlation by altitude in the species number of vascular plants, the species number of naturalized plants, and the naturalization index. Method: This study utilized the flora survey data for 14 years from 2006 to 2019 in the 3rd to 5th National Natural Environment Survey. One-way ANOVA analysis was performed by region and altitude to examine the differences in the species number of vascular plants, the species number of naturalized plants, and the naturalization index. Researchers performed curvilinear estimation regression analysis to find the correlation, and SPSS Statistics 21 statistical program was used for statistical analysis. Results: There were differences by region and altitude in the species number of vascular plants, the species number of naturalized plants, and the naturalization index. The species number of vascular plants had a positive correlation with an increase in the number of species as the altitude increased. The species number of naturalized plants had a negative correlation with a decrease in the number of species as the altitude increased. The naturalization index had a negative correlation that decreased up to a certain altitude, increased after that point, and then decreased again. Conclusion: As for vascular plants, the higher the altitude, the greater the species number of vascular plants, and the lower the altitude, the fewer vascular plant species. Conversely, as for naturalized plants, the lower the altitude, the greater the species number of naturalized plants, and the higher the altitude, the fewer naturalized plant species. In addition, as for the naturalization index, the lower the altitude, the higher the naturalization index, and the higher the altitude, the lower the naturalization index. This study is expected to be utilized as basic data for managing naturalized plants.

A Study on the Distribution Characteristics of NATURALIZED PLANTS: For Gyeongsangbuk-do Area

Byeonggu Yang,Changjun Kim,Hyangju Lee,Wonhyeon Lim J-INSTITUTE 2021 International Journal of Human & Disaster Vol.6 No.2

Purpose: Naturalized plants come in artificially or naturally, producing and spreading large numbers of seeds. Naturalized plants are not culled in the natural ecosystem and coexist in their own way. They have a wide range of tolerance and fast growth rates. Therefore, this study analyzed the differences of naturalized plants in the Gyeongsangbuk-do area by population density, forestland ratio, farmland ratio, land ratio, road ratio, and river ratio. We investigated the correlation with the naturalization index to understand the distribution characteristics of naturalized plants. Method: We conducted one-way ANOVA and multivariate analysis of variance(MANOVA) to determine the differences between the number of naturalized plant species and the items related to the naturalization index. Post-hoc analysis was performed through the Scheffe test method. We performed curvilinear regression analysis to find out the correlation. We used the Spss Statistics 21 statistics program to perform the above statistical analysis. Results: The naturalization index of naturalized plants showed differences in four items: population density, farmland ratio, land ratio, and river ratio, but there were no statistical differences in the two items, such as forestland ratio and road ratio. The farmland ratio did not affect the increase or decrease in the naturalization index. When the land ratio and road ratio increased, the naturalization index was also positively correlated. The river ratio had a positive correlation, but it had a negative correlation again after a certain point. Conclusion: The results of this study are expected to be used as data for selecting priority areas to manage naturalized plants. In addition, the data of this study can be used as basic data to study the naturalization index and environmental change of naturalized plants. However, we propose that comprehensive management for naturalized plants, such as analysis of the inflow path and distribution characteristics of naturalized plants between domestic regions, should be ca rried out continuously at the administrative level of local governments.

공원녹지내 사화직물 출현실태 분석에 관한 연구

노재현 한국조경학회 1998 韓國造景學會誌 Vol.26 No.3

The purpose of this study is on identifying real condition of naturalized plants in urban green space. For this, Chollabak-do region was selected for case study. The occurring frequency and distribution status was investigated by field survey. The area of green open space, level of management and passed years after construction etc, were analized to identify the influence on occurrence of naturalized plants. The result is as follows: 1. In 18 sites, 145 taxa as weed species including naturalized plants were occurred. Average No. of occurring taxa is 22.7. Two families of plants, Graminae and compositae charged the most part. Also the rate of naturalized plant among them is 29.7%. 2. Naturalized species showing high occurring rate are 14 taxa of compositae, 5 taxa of Gramineae, Leguminosae and 4 taxa of cruciferae. These plants of previous four somatic polymorphism among all the naturalized plants. 3. The taxa number of naturalized plants were reducedby intensive management. But the rate of naturalized plants in extensively managed area was relatively lower than intensively managed one. Naturalizd plants were widely distributed in most of urban green space with being cognitioned as whole weed. 4. In origin of naturalized plants, the taxa from north America were 16 and the taxa from Europe were 16. Therefore the rate originated from north America and Europe charged high part as 68.2%. The rate of Annual, Biennial and Perennial were each 78.7%, 21.3%. The alternative of management for control aganist disturbance by Annual & Biennial required. 5. Multi-relations analysis shows 0.81 which is the relatively high interralation between the number of emerged axa and that of naturalized ones. 6. The number of naturalized species has no relation to the lapse of years after construction of open-space. Especially it was identified that weed control in the beginning of construction is very important. On the other hand the relation between Ys and Xp was Ys=1.784Xp+4.646.

전라남도 동부지역의 귀화식물 분포 및 관리방안

박문수,임동옥,김하송 한국자원식물학회 2011 한국자원식물학회지 Vol.24 No.5

This study was carried out to investigate the distribution status and urbanization index of the naturalized plants. For this purpose, 7 cities and counties in the eastern area of Jeollanamdo were selected and investigations were conducted on a total of 14 sites, during the period of March 2006 to November 2008. The naturalized plants were identified as 123; 22 families, 75 genera, 118 species, and 5 varieties. As for the urbanization index, Suncheon city had the highest level of urbanization (33.45%) and Gurye county the lowest level of urbanization (20.21%). Classification families were as follows: Compositae 40 kinds (30.1%) Gramineae 17 kinds (12.8%) and Leguminosae 14 kinds (10.5%). Major communities of naturalized plants consisted of 20 communities including Erigeron annuus community, Erigeron canadensis community, Alnus firma community, Amorpha fruticosa community, Oenothera odorata community, Bidens frondosa community, Coreopsis tinctoria community, Ambrosia artemisiifolia var. elatior community etc. Invasive naturalized plants consisted of 5 taxa: Ambrosia artemisiifolia var. elatior, Ambrosia trifida, Eupatorium rugosum, Paspalum distichum var. indutum and Paspalum distichum. The distributional characteristics of naturalized plants were divided on the basis of six areas associated with ecological characteristics of a habitat. 본 조사는 2006년 3월부터 2008년 11월까지 전라남도 동부지역 7개 시・군 14개 지역의 귀화식물과 도시화지수를 분석하였다. 귀화식물은 총 22과 75속 118종 5변종 123종류가 조사되었다. 조사지역별로는 순천시 시가지가 83종으로 가장 많았고, 여수시 산업단지 66종, 여수시 시가지와 고흥군 도로변이 각각 52종이었다. 낮게 나타난 지역은 순천시 쓰레기매립장과 장흥군 농공단지가 각각 21종, 구례군 지리산국립공원 구례지역이 27종이었다. 도시화지수는 순천시가 30.31%로 가장 높았고, 구례군이 18.12%로 가장 낮았다. 과별 출현 종류는 국화과 37종류(30.1%)로 가장 많았고, 벼과 17종(13.8%), 콩과 14종(11.4%), 십자화과 8종(6.5%), 마디풀과 7종(5.7%), 메꽃과 5종(4.1%) 순이었다. 주요 귀화식물군락은 아까시나무군락, 족제비싸리군락, 원추천인국군락, 털물참새피군락, 서양민들레군락, 미국자리공군락, 양미역취군락, 소리쟁이군락, 개망초군락, 망초군락, 달맞이꽃군락, 미국가막사리군락, 기생초군락, 돼지풀군락, 만수국아재비군락, 울산도깨비바늘군락, 노랑코스모스군락, 애기땅빈대군락, 미국개기장군락, 비짜루국화군락 등 총 20개 군락이 확인되었다. 생태계 위해 귀화식물은 돼지풀, 단풍잎돼지풀, 서양등골나물, 털물참새피, 물참새피 등 5종이었다. 생육지별 특성에 따라 시・군 읍 지역, 국립공원지역, 농공단지 지역, 강 및 하천지역, 쓰레기매립장 지역, 항만 및 산업단지 지역 등 6개 지역으로 구분하였으며, 각 분포지역의 생태적 특성을 비교한 후 관리방안을 제시하였다.

HUMAN & DISASTER: A Study of Prediction on the species Number and Naturalization Index of Land Naturalized plants

Lee Hyang-ju,Cheon Woo-kwang,Lim Won-hyeon J-INSTITUTE 2020 International Journal of Human & Disaster Vol.5 No.1

Foreign plants introduced by overseas exchanges are rapidly transformed into naturalized plants and pose serious threats to biodiversity, including domestic native species. Therefore, this study is based on the flora survey data of 776 map numbers(1200 places) for 12 years from 2006 to 2017, the third to fourth data of the National Natural Environment Survey, the nation’s largest basic research project on the natural ecosystem. By analyzing plant species and naturalized plant species and predicting naturalized plant species and naturalization Index, they can be used as basic data to study environmental changes, or they can be used to set various indicators applying naturalized plants and naturalization Index and to set the upper limit of permit for development activi-ties. Therefore, in this study, one-way ANOVA analysis and MANOVA analysis were conducted to determine whether there is a difference in naturalized plant species and naturalization Index by year, region, altitude, pop-ulation density, GDP, and the ratio of forest to area. There was a correlation between the items such as year, region, altitude, population density, GDP, the ratio of forest to area and the number and naturalization Index of naturalized plants, and the greatest impact on the naturalized plant species and naturalization Index. Curve es-timation regression, multiple regression, and dummy variable regression were performed to find out which items are causing the problem. Through this research, it is thought that the naturalization Index predicted by this study can be used for the issue of Permit on Exclusive use of inter-mountain area altitude standard, which is operated under the Act on Planning, and Use of National Territory, and the Mountain Site Management Act. The natural-ization Index predicted by this study can be used as basic data for setting the upper limit of Permit on Exclusive use of inter-mountain area, or for studying environmental change, or for setting various indicators.

용추계곡을 포함한 창원시 정병산의 관속식물상

이기숙 ( Lee Gi-sook ),문현식 ( Moon Hyun-shik ),김태운 ( Kim Tae-woon ),이재순 ( Lee Jae-soon ) 한국도서(섬)학회 2022 韓國島嶼硏究 Vol.34 No.1

This study was conducted for the purpose of providing basic data for establishing a plant resource conservation and management plan by comprehensively analyzing the vascular flora distributed in Jeongbyeong(Mt.), Changwon-city. Field surveys were conducted on average more than 30 times in 9 courses from February 2014 to November 2020, and the results are summarized as follows. The vascular flora of Jeongbyeongsan(Mt.) was summarized as 464 taxa including 107 families, 275 genera, 404 species, 5 subspecies, 10 forms and 45 varieties. Among them vascular flora identified around Yongchu valley was 319 taxa, accounting for about 69% of the total. The endemic plants were 14 taxa such as Impatiens koreana, Thalictrum actaefolium var. brevistylum and so forth,, and endemic plants rate was 3.01% and 3.89% of 360 taxa of Korean endemic plants. The rare plants were 13 taxa There were 3 taxa as critically endangered species such as Impatiens koreana and Magnolia kobus, 2 taxa as endangered species such as Jeffersonia dubia and Lycoris sanguinea var. koreana, 1 taxa as vulnerable species such as Iris minutiaurea, 6 taxa as least concerned species such as Aristolochia contorta, and 1 taxa as data deficient species such as Chloranthus fortunei. Among these rare plants, 11 taxa except for Tricyrtis macropoda and Iris minutoaurea were found in the vicinity of the Yongchu valley. For these rare plants, research to elucidate the ecological characteristics of their habitats should be conducted. The naturalized plants were 19 taxa including Solanum americanum, Aster pilosus and so forth, and the naturalized index was 4.1%. Invasive alien plants were Ambrosia artemisiifolia and Aster pilosus. The plants of concern for serious invasion into forests were 4 taxa such as Oenothera biennis, Aster pilosus and Erigeron annuus. Of the 19 taxa of naturalized plants, 11 taxa were identified around the Yongchu valley. Since there is a high possibility that the growing environment will be disturbed due to the continuous increase in visitors and intermittent construction, the spread of naturalized plants around the valley area should be monitored. The specific plants by floristic region were 61 taxa; 37 taxa such as Betula schmidtii and Aconitum jaluense of grade I, 3 taxa such as Caryopteris incana and Lilium distichum of grade II, 12 taxa such as Acer palmatum and Adoxa moschatellina of grade III, 4 taxa such as Fallopia sachalinensis and Prunus davidiana of grade IV, 5 taxa such as Impatiens koreana and Jeffersonia dubia of grade V, Target plants adaptable to climate change were 13 taxa; 4 taxa of endemic plants, 1 taxa of northern plant, and 8 taxa of southern plants.

A Study on the CHANGE in Plants of the Wind Power Complex in Mt. Hyeonjong

Changjun Kim,Hyangju Lee,Wonhyeon Lim J-INSTITUTE 2020 Protection Convergence Vol.5 No.2

Purpose: To identify the changes in plants before, during, and after the wind farm construction in Mt. Hyeonjong, we investigated the number of plant species. And we studied the main characteristics of the distribution status in plants family composition, plant life form analysis, Korean endemic plant, rare plant, specific plants by phytogeography, naturalized plant, and invasive alien plants. We compared this data to confirm the change before or after the wind farm construction. Method: We conducted the plants form research 16times in five years. Before the wind farm construc-tion(2014 and 2015), during the wind farm construction(2017 and 2018), and after the wind farm con-struction(2019). Plants changes were analyzed based on the results obtained through field trips. Accord-ing to the national standard plant list, we listed plant names and scientific names(the Korea national arboretum & the plant taxonomic society of Korea 2015). We arranged the classification groups according to the Engler system. Based on the created plants list, the Korean endemic plant, rare plant, specific plants by phytogeography, naturalized plant, and invasive alien plants were extracted and analyzed. Results: The vascular plants decreased compared to before wind farm construction. Compositae was the most common category in plants family composition. Korean endemic plants decreased from 3 spe-cies before the construction to 2 species after the construction. Rare plants were investigated 4 species of Vulnerable species(VU) and 2 species of Least Concerned species(LC). Specific plants by phytogeogra-phy were surveyed the same as a total of 13 species. Naturalized plants decreased from 33 species to 20 species and 26 species. Then, they increased again. Conclusion: As a result of this study, the total plant species, Korean endemic plant, and rare plant growing were reduced in the wind farm section in Mt. Hyeonjong. However, many Naturalized plants and 1 and 2 years old herbage appeared in the area. So we found out that ecological stability was not yet stable, and the disturbance was continuing. In this study, the investigation period after wind farm con-struction is one year, which is a short time to observe and analyze plants succession state, and a follow-up study to examine the growth characteristics of plants more closely is needed.

성주지역 문화재 지정(보호)구역 내 외래식물의 현황

신현탁,김용식,이명훈,윤정원 국립문화재연구원 2011 헤리티지:역사와 과학 Vol.44 No.1

본 연구는 경상북도 성주군에 분포하고 있는 주요 문화재 지정(보호) 구역을 중심으로 식물상 조사 결과를 토대로 외래식물 및 귀화식물의 현황을 분석함으로써 전통문화공간의 정체성을 알리고 이에 따른 보전방안 수립을 위한 기초자료를 제공하기 위해 실시되었다. 관속식물상은 세종대왕자태실의 경우 50과 93속 94종 16변종 4품종으로 114분류군이었으며 이 중 외래식물은 15분류군, 귀화식물은 16분류군으로 귀화율 14.04%, 도시화지수 5.90%를 나타냈다. 성주향교는 40과 64속 57종 8종 4품종으로 68분류군이었으며 이 중 외래식물은 17분류군, 귀화식물은 30분류군으로 귀화율 44.12%, 도시화지수 11.07%로 나타났다. 성밖숲은 34과 58속 55종 5변종 1품종으로 61분류군이었으며, 이 중 외래식물은 10분류군, 귀화식물은 17분류군으로 귀화율 27.87%, 도시화지수 6.27%로 나타났다. 한개마을은 92과 183속 182종 1아종 32변종 14품종으로 230분류군이었으며 이 중 외래식물은 28분류군, 귀화식물은 85분류군으로 귀화율 37.12%, 도시화지수 31.37%로 나타냈다. 성산고분군은 55과 107속 106종 19변종 6품종으로 131분류군이었으며 이 중 외래식물은 18분류군, 귀화식물은 22분류군으로 귀화율 16.79%, 도시화 지수 8.12%로 나타났다. 성주향교의 경우 귀화율이 가장 높았으며, 한개마을의 경우 귀화율 및 도시화지수에서 모두 높은 값을 나타내고 있었다. 5개 지역 모두 외래식물 및 귀화식물에 대한 대책의 수립이 필요하며 특히 한개마을의 경우 마을 전체에 대한 관리계획의 수립이 필요하다. 또한 성주향교 및 한개마을 지역에서 모두 생태계교란야생동식물 중 하나인 돼지풀의 출현을 확인한바 이에 따른 관리대책이 요구된다. The purpose of this study was to analyze the current status of both exotic and naturalized plants in the designated Cultural Preservation Area located in Seongju-gun, Gyeongsangbuk-do in order to identify traditional cultural places and to provide basic information to prepare a conservation strategy. The vascular plant species was identified as having 114 taxa: 50 families, 93 genera, 94 species, 16 varieties and 4 forms in King Sejong's Prince Taesil. Among them are 15 taxa of the exotic plant species and 16 taxa of naturalized plant species, which resulted in 14.04% of the Naturalization Rate and 5.90% of the Urbanization Index. The vascular plant species was identified as 68 taxa: 40 families, 64 genus, 57 species, 8 varieties and 4 forms in the Seongju Hyanggyo. Among them, the exotic plants recorded 17 taxa with 30 taxa of naturalized plants. The Naturalization Rate was 44.12% and Urbanization Index was 11.07%. The Seongbaksup, which was a grove outside of the Seongju Fortress recorded 61 taxa: 34 families, 58 genera, 55 species, 5 varieties and 1 form. Among them, the exotic plant species consisted of 10 taxa with 17 taxa of naturalized plants, with a 27.87% Naturalization Rate and a 6.27% Urbanization Index. The vascular plant species was recorded as 230 taxa: 92 families, 183 genus, 182 species, 1 subspecies, 32 varieties and 14 forms in Hangae Village. Among them, exotic plants consist of 28 taxa with 85 naturalized plant species, with a Naturalization Rate of 37.12% and Urbanization Index of 31.37%. The vascular plant species in the Seongsan Ancient Tomb is recorded as having 131 taxa: 55 families, 107 genus, 106 species 19 varieties and 6 forms. Among them, exotic plants consist of 18 classifications, and naturalized plants consist of 22 classifications with a Naturalization Rate of 16.79% and an Urbanization Index of 8.12%. The Seongju Hangyo recorded the highest Naturalization Rate among all surveyed sites in Hangae Village. All five of these surveyed sites will require a management plan to eradicate both exotic and naturalized plant species. Hangae Village especially needs to prepare a management plan. The invasion of ragweed in Seongju Hanggyo and Hangae Village, which is one of the most invasive plant species to disturb the ecosystem, is in need of management to eradicate it.

낙동강 합천창녕보 주변 습지공원지역에 서식하는 자생 초본식물과 귀화 초본식물의 기능 형질 분석

손민정,남기정 한국하천호수학회 2021 생태와 환경 Vol.54 No.4

The two main hypotheses that explain why invasive alien plants successfully colonize new environments are: 1) invasive alien plants are functionally different from native plants in a community, and 2) the plants can adapt well to new environments because they are functionally similar to native plants. The present study investigated the functional traits of naturalized alien herbaceous plants and their native neighbors in a riparian park area near the Hapcheon-Changyeong weir along the Nakdong River to determine which of the two hypotheses applied to the study area. According to the results, leaf functional traits, such as leaf area, specific leaf area, leaf thickness, leaf dry matter content, leaf nitrogen content, and leaf carbon content differed between naturalized alien and native plants, which could be attributed to the higher leaf nitrogen contents in naturalized alien plants than in native plants. The high leaf nitrogen contents are associated with high photosynthetic rates, which lead to effective resource use and rapid growth; therefore, naturalized alien plants growing in the study area were considered to have such functional traits. The results of the present study support the hypothesis that the successful establishment of invasive alien plants is attributed to the functional trait differences between invasive and native plants.

농업생태계에서 농경지유형에 따른 C4식물의 출현과 분포

조광진 ( Kwang Jin Cho ),오영주 ( Young Ju Oh ),강기경 ( Kee Kyung Kang ),한민수 ( Min Su Han ),나영은 ( Young Eun Na ),김미란 ( Mi Ran Kim ),최락중 ( Lak Jung Choe ),김명현 ( Myung Hyun Kim ) 한국농림기상학회 2013 한국농림기상학회지 Vol.15 No.2

본 연구는 논, 밭, 과수원, 도로변에 생육하고 있는 식물상을 조사하여 C4식물의 분포특성을 규명하고자 하였다. 현장조사는 2002년부터 2006년까지 5년간 수행되었다. 그 결과, 총 74과 231속 352종이 확인되었으며, 쌍자엽식물 255종, 단자엽식물 89종, 양치식물 8종으로 분류되었다. 농경지유형별로는 논에서 55과 203종, 밭에서 49과 218종, 과수원에서 44과 115종, 도로변에서 48과 202종이 출현하였다. 본 조사를 통하여 논은 쑥과 고마리, 밭과 도로변은 쑥과 개망초, 과수원은 닭의장풀과 바랭이로 대표되며 농업생태계에서 출현율이 가장 높은 식물은 쑥으로 확인되었다. 또한, 출현식물 중 C4식물은 8과 25속 38종으로 확인되었으며, 논, 과수원, 도로변에서는 C4 단자엽식물의 출현율이 높았으며 밭에서는 다른 농경지유형에 비해 쌍자엽식물의 출현빈도가 높았다. 이러한 C4식물의 출현율 차이는 고온 건조한 우리나라 밭 주변 식물서식환경을 반영하고 있으며, 논과 과수원은 상대적으로 습윤한 미기후조건에서 건조조건이 아니라 온도조건에 의해 C4 단자엽식물이 분포하는 것으로 생각되었다. 또한 농업생태계를 대표하는 C4식물 중 단자엽식물은 바랭이와 닭의장풀이며 쌍자엽식물은 개비름과 명아주로 확인되었다. 본 조사에서 총 47종의 귀화식물이 확인되었으며 토양의 수분환경조건이 상대적으로 건조한 밭과 도로변에서 많은 귀화식물이 출현하였다. 귀화식물 가운데 C4 식물은 비름속의 개비름과 털비름 2종으로 나타났으며, 단자엽식물은 관찰되지 않았다. 본 연구에서는 농경지유형에 따른 대표적인 C4식물의 분포특성이 확인되었으며 지구온난화로 인한 기온의 상승으로 고온에 적응성이 높은 C4식물의 새로운 유입과 이미 유입된 종 가운데 농업생태계에 나쁜 영향을 미칠 수 있는 외래식물의 확산에 대한 장기적인 모니터링의 필요성을 제안하였다. In order to search for distribution characteristics on C4 plants at the paddy fields, uplands, orchard and roadside in South Korea, vascular plants were investigated. Flora investigation had been carried out from May 2002 to October 2006 at 241 plots. In the results of survey, the flora of these areas consist of 74 families, 231 genera and 352 species totally. The class frequencies were arranged by the order of Magnoliopsidae (255 species), Monocotyledoneae (89 species), Pteropsida (7 species) and Sphenopsida (1 species). The number of species in each investigated agricultural field types was 55 families with 203 species in paddy field, 49 families with 218 species in uplands, 44 families with 115 species in orchard and 48 families with 202 species in roadside respectiviely. Representative species compositions of these four agricultural field types were characterized by Artemisia princeps, Persicaria thunbergii in paddy field, Artemisia princeps, Erigeron annuus in upland and roadside, Commelina communis, Digitaria ciliaris in orchard, respectively. Therefore, indicative species in agricultural ecosystem was Artemisia princeps. Among the investigated 352 species, C4 plants identified were 38 species, and the occurrence ratio of C4 monocotyledonous plants were higher in paddy field, orchard and roadside than upland. Such differences in the occurrence ratio of C4 plants under diverse agricultural field types reflect differences in environmental condition such as micro-climate, soil moisture under various agricultural fields. Dominant C4 monocotyledonous plants were Digitaria ciliaris and Commelina communis, while C4 dicotyledonous plants were Amaranthus mangostanus and Chenopodium album var. centrorubrum in agricultural fields. Naturalized plants were identified as 47 species and occurrence ratio were higher in upland and roadside than other agricultural field types. Among the investigated naturalized plants, C4 plants were Amaranthus mangostanus and Amaranthus retroflexus. Distribution characteristics of representative C4 plants in agricultural field types, revealed that the projected increase in temperature due to climate change may provide better conditions for the growth of C4 plants. Thus, the necessity of long-term monitoring should be conducted on the diffusion of C4 plants that may threaten influence agroecosystem in Korea.