A Study on the Appropriate Management Plan for the Ecological Characteristics of Amsadong Ecological Landscape Preservation Area in Han River†

This study analyzed the ecological changes of the Amsa-dong ecological landscape conservation area and the Amsa ecological park where concrete revetment blocks were removed and river vegetation was restored in 2008. The natural riverside area was designated as an ecological landscape conservation area in Amsa-dong, Gangdong-gu, Seoul on December 30, 2002. It is located in Gwangnaru district of Han River Park, with a length of 0.8 km, a cross section of 150 m, and an area of 126,844 m². The riverside ecological restoration area is around 616-1 in Amsa-dong, Gangdong-gu, Seoul. The area is 143,435 m². As a result of the analysis of plant ecological changes in natural riverside areas, the distribution area of the wetland native woodpecker has increased continuously from 6.1% in 2001 to 31.9% in September 2021. Wetland herbs decreased from 85.8% in 2001 to 54.5% in September 2021. The natural riverside area formed a wetland ecosystem by naturally depositing sediment from the upper stream of the Han River. However, since the construction of the Jamsil underwater dam, the water level has risen and the water level has been maintained at all times except during the temporary flood season. As the number of wetland trees increases, the number of wetland herbs decreases. According to a survey of changes in the ratio of actual vegetation in the riverside ecological restoration area, the area of the wetland native woodpecker was 5.9% of the willow planted in the shrubs in 2009. Since then, willow and willow have increased to 39.6% in September 2021. Wetland herbs decreased from 53.5% in 2009 to 10.4% in September 2021. The number of wild birds appearing in both natural and riverside ecological restoration areas has increased. The population decreased in natural riverside areas and increased in riverside ecological restoration areas. As reed communities turned into willow communities, mountain birds increased and waterfowl decreased. The riverside ecological restoration area began to form a variety of habitat for wild birds as the trees grew from the beginning of the restoration. The larvae of the vines, japanese-hop, burcucumber, and the white-oldfield-aster should be uprooted during the relatively easy-to-separate flowering season and removed before they bear fruit. After establishing a restoration plan suitable for the riverside ecosystem, dry land plants shall be disposed of. It is necessary to gradually plant native tree species that can withstand flooding and flooding caused by the periodic nature of rivers.