This study was carried out to evaluate the physicochemical properties and perform a feasibility analysis of planting material composed of topsoil from river improvement and non-improvement areas. The results showed that the physicochemical properties of topsoil from river improvement areas were on the average sandy loam~loamy sand in soil texture, 5.6~6.8 in pH, 0.01~0.06 dS/m in EC, 0.9~2.1% in OM, 0.02~0.12% in T-N, 8~14 cmol+/kg in CEC, 0.01~0.08 cmol+/kg in Ex. K+, 2.55~11.11 cmol+/kg in Ex. Ca2+, 0.34~2.06 cmol+/kg in Ex. Mg2+, and 3~396 mg/kg in Av. P2O5. And non-improvement areas showed on average sandy clay loam~sand in soil texture, 5.7~6.7 in pH, 0.02~0.08 dS/m in EC, 0.9~4.4% in OM, 0.02~0.23% in T-N, 7~18 cmol+/kg in CEC, 0.01~0.08 cmol+/kg in Ex. K+, 3.81~12.67 cmol+/kg in Ex. Ca2+, 0.60~1.95 cmol+/kg in Ex. Mg2+, and 3~171 mg/kg in Av. P2O5. Meanwhile, the results of an applied valuation of topsoil- based planting were as follows. Ex. K+ levels were low grade in all survey areas. OM was low grade in 12 improvement areas and 11 non-improvement areas. Av. P2O5 levels were low grade in 10 improvement areas and 10 non-improvement areas. T-N was low grade in six improvement areas and four non-improvement areas. Ex. Mg2+ levels were low grade in two improvement areas.

Purpose of this study was to evaluate germination characteristics of soil seed bank in rural stream topsoil using seedling emergence method in order to provide data for future ecological restoration of stream utilizing topsoil. There were 24 families, 52 genera, 61 taxa of soil seed bank flora found in topsoil from 6 rural streams. The most frequently found taxa were Compositae (12 taxa) followed by Gramineae (8 taxa), Caryophyllaceae (5 taxa), Cruciferae (4 taxa), Scrophulariaceae, Labiatae, Polygonaceae and Cyperaceae. Plant with the most number of germination was Stellaria aquatica followed by Erigeron annuus, Imperata cylindrica var. koenigii, Poa annua, Cyperus microiria and Veronica undulata. Naturalized plants found were Erigeron annuus, Rumex crispus, Oenothera odorata, Cerastium glomeratum, Bidens frondosa, Erigeron philadelphicus, etc.

This study was carried out to evaluate the physicochemical properties of topsoil from forest development area. The results of physicochemical properties of topsoil from forest development area shown on the average loamy sand~sandy clay loam in soil texture, 5.3~7.1 in pH, 0.02~0.18 dS/m in EC, 0.7~1.8% in OM, 0.03~0.11% in T-N, 11~15 cmol+/kg in CEC, 0.02~0.04 cmol+/kg in K+, 4.51~8.18 cmol+/kg in Ca2+, 0.93~2.77 cmol+/kg in Mg2+, 6~49 mg/kg in available phosphate. And the results of physicochemical properties of topsoil from forest non-development area shown on the average sandy loam~sandy clay loam in soil texture, 4.4~5.3 in pH, 0.03~0.05 dS/m in EC, 3.1~4.6% in OM, 0.13~0.23% in T-N, 14~18 cmol+/kg in CEC, 0.02~0.04 cmol+/kg in K+, 0.78~3.82 cmol+/kg in Ca2+, 0.29~1.31 cmol+/kg in Mg2+, 3~31 mg/kg in Av. P2O5. On the other hand, forest development area of topsoil sand content higher than 8~18% sand content than the forest non-development area. This trend is thought to be the absence of topsoil management development projects. Consequently, the results suggested a high potential of recycling of the topsoil from forest non-development area for planting soil. Therefore, in construction of the conservation and management of topsoil from forest non-development area is very important.