We described a spatial distribution pattern and floral diversity on the Paspalum distichum community occurring at the ecological parks of Hwamyeong, Daejeo, Samnak, and Maekdo in the Nakdong river estuary. A total distribution area of P. distichum community was 303,462.6 m2. Its largest area was found in Samnak eco-park (185,910.1 m2). The most richness of knotgrass patches in each ecological park was determined Maekdo eco-park (87). Cover class level-5 shows the largest area (260,663.2 m2). A total of 73 taxa (34 families, 55 genus, 65 species, and 8 varieties) were listed up on the P. distichum community. A welldeveloped population of knotgrass was found predominantly at sites linked into human impacts at the riverine floodplain, the stream courses flowing through the parks, and the man-made channels and wetlands. Finally we proposed an ecological management strategy for knotgrass population in the study area.

• 임정철(국립환경과학원 국립습지센터) | Jeong-Cheol Lim (National Institute of Environmental Research, 38, Isan-gil, Ibang-myeon, Changnyeong-gun, Gyeongsangnam-do 50303, Republic of Korea)
• 정현기(국립환경과학원 한강물환경연구소) | Hyun-Gi Jeong (Han River Environment Research Center, 42, Dumulmeori-gil 68beon-gil, Yanseo-myeon, Yangpyeong-gun, Gyeonggi-do 12585, Republic of Korea)
• 이철호(동의대학교) | Cheol-ho Lee (Department of Molecular Biology, Dongeui University, 176, Eomgwang-ro, Busanjin-gu, Busan 47340, Republic of Korea)
• 최병기(동의대학교) | Byoung-Ki Choi (Department of Molecular Biology, Dongeui University, 176, Eomgwang-ro, Busanjin-gu, Busan 47340, Republic of Korea) Corresponding author