The abiotic factors and the vegetation naturalness of the 13 tributary wetlands around Namgang-River
were assessed to investigate the present state and to present the conservation counter plan for the wetland
ecosystem of the tributaries. Assessment indices for the abiotic factors were estimated based on the dominant land
use types of the riparian zone, ecological function of the upper levee, levee slope structure, artificiality and
utilization intensity of the waterfront, artificiality of the revetment structure, diversity of the substrate, and severance
of the transverse. The assessment index of Omi-cheon is the highest among 13 tributaries. The second was
Banseong-cheon and third was Hyangyang-cheon, followed by Nabul-cheon and Yeongcheon-gang and Sugok-cheon,
Jungchon- cheon, and Daegok-cheon in their order and Munsan-cheon got the lowest assessment index. Assessment
indices for the vegetation naturalness were estimated based on the vegetation diversity, exotic species dominance,
annual herb dominance, naturalness and peculiarity of the vegetation, and species diversity. The assessment index of
Omi-cheon is the highest among 13 tributaries. The second was Sugok-cheon and third was Banseong-cheon,
followed by Yeongcheon-gang, Jungchon- cheon, Jinae-cheon, Nabul-cheon, and Jisu-cheon in their order, and
Yonga-cheon got the lowest assessment index. The grades of the stream naturalness were estimated based on the the
naturalness indices for the abiotic factors and the vegetation naturalness. The grades of Omi-cheon is the highest
among 13 tributaries as the grade Ⅰ. Those of Banseong-cheon, Sugok-cheon, Yeongcheon-gang, Nabul-cheon and
Jungchon-cheon, Hyangyang- cheon, Jinae-cheon, Jisu-cheon, Daegok-cheone, and Munsan-cheon and Doksan-cheon
were grade Ⅱ in their order, and Yonga-cheon got the lowest as the grade Ⅲ. It was suggested that restoration of the simple and flat substrate, create the natural vegetation on the levee slope constructed with concrete or stone
wall, and rehabilitation of the eco-bridge were demanded to improve the grades of the stream naturalness through
the restoration of the tributaries for the diverse aquatic wildlife, high vegetation diversity and species diversity with
the vegetation consisted of perennial herbs and trees.
Keywords : wetland ecosystem, stream naturalness, abiotic factors, vegetation naturalness, assessment index,
Namgang-River, tributary