This study aims to compare the floristic status of six paddy fields with different chronosequences after rice crop closure. The study sites are located on the highlands and near an abandoned farm house of Gosanri Wanjumyeon Iksangun, Joeonbuk. All sites are adjacent to each other. We established a line transect along longitudinal and transverse direction within each site. The flora, plant cover and height of plants within 1 m × 1 m quadrat along the transect were recorded. We counted 34 Salix koreensis on 8 year old abandoned paddy field in 2008 and 23 Salix koreensis invaded more in this field until 2010. Typha orientalis, Salix koreensis, Phragmites japonica, Bidens frondosa and Persicaria thunbergii dominated on 13 year old abandoned paddy field. Phragmites japonica, Bidens frondosa and Persicaria thunbergii were recorded on 13 year old abandoned paddy field. Leersia japonica, Persicaria thunbergii and Typha orientalis dominated on 7 year old abandoned paddy field. No trees were discovered on 6 year old abandoned paddy field because of high water depth generated from bad draining. The exchangeable Ca content increased in each site as time goes by. The total mean species number of soil seedbank analysis did not indicate significant differences between study sites. It is suggested that colonization of plants on abandoned paddy field depend upon the condition of drain and soil chemical contents.

• 김기대(한국교원대학교 환경교육과) | Kee Dae Kim Corresponding Author