Invasive alien plants were identified and recorded in Ulsan city based on field surveys and related literatures. These plants consisted of 147 taxa in total, belonging to 30 families, 93 genera, 144 species, 2 subspecies and 1 variant. The family of Asteraceae was predominant with 42 taxa, followed by Gramineae with 27 taxa and Leguminosae with 15 taxa. According to the result of life-form based distribution analysis revealed that 62 taxa (42.2%) were annual plants, 48 taxa (33.6%) were perennial plants, 34 taxa (23.1%) were biennial plants, and 3 taxa (2%) were woody perennials. Compare to other administrative districts in Korea, prevalence of invasive alien plants in a certain city of Ulsan showed the seventh highest species number followed after Jeju, Gyeonggi, Jeonnam, Incheon, Seoul and Gangwon. On the basis of the results from the country origin analysis, two dominating taxa were introduced from Europe and America, 55 taxa and 51 taxa respectively. The spreading grade of alien plants was elucidated in order of 1 grade (PS) 67 grade (21.1%)>2 grade (MS) 31 taxa (21.1%) >5 grade (WS) 18 taxa (11.6%)>3 grade (CS) 17 taxa (11.6%)>4 grade (SS) 14 taxa (9.5%). Ulsan city is one of a pivotal conduit for the introduction of invasive alien plants. Thereby, reliable management plans are required to monitor these species.

Abstract
 서 론
 재료 및 방 법
  1. 연구 지역
  2. 연구 방법
 결과 및 고 찰
  1. 울산광역시의 침입외래식물 현황
  2. 생활형 구분
  3. 행정구역별 비교
  4. 원산지별 구분
  5. 이입시기 및 도입 구분
  6. 확산등급
  7. 침입외래식물의 서식지별 분포 특성
 REFERENCES

• 이윤근(울산대학교 생명과학부) | Yunkeun Lee (Department of Biological Sciences, University of Ulsan)
• 문경희(울산교육연구정보원) | Kyoung-hi Moon (Ulsan Education Research & Information Institute)
• 임하우(울산대학교 생명과학부) | Ha-woo Lim (Department of Biological Sciences, University of Ulsan)
• 최기룡(울산대학교 생명과학부) | Kee-ryong Choi (Department of Biological Sciences, University of Ulsan) Corresponding author