경안천 유역 하성면에 발달한 토양 특성 = Soil Characteristics on the Fluvial Surface in the Basin of Kyeongan-cheon(Stream)

다국어 초록 (Multilingual Abstract)

The purpose of this study is to clarify the relict landform development of fluvial terrace and the soilcharacteristics occurring on the fluvial deposits. The physico-chemical properties of soil that are developed on terracedeposits and X-ray diffraction analysis of clay were investigated specifically. The horizon of A1 consists of silt loam withreddish-brown color (5YR4/3). Its soil structures is a weak, fine, subangular, and blocky, breaking to granular. Thehorizon of B1t and B2t are silt clay with either a yellowish red (5YR5/6), bright red (2.5YR4/6) color. This soil structureis weak, subangular, and blocky, with thin discontinuous bright red (2.5YR4/6) clay cutans and soft manganeseconcretions. This red soil structure is made on heavy-textures. It is packed compactly with parent materials of high fluvialsurface sediments, and usually has a A1-B1t-B2t-C profile, from top to bottom. In most cases, clay accumulation in the B-horizon and clay cutans on ped surfaces are observed, which means the argillic horizon has formed. The soils derivedfrom fluvial surface deposits are associated with soils. The soils on the high fluvial surface are considered to be a kind ofpaleo-red soil which were developed by strong desilicification and rubefaction, and strong leaching of bases under warmerbio-climatic condition during the old Pleistocene period. According to these morphological and anlaytical characteristics,geomorphological features and bio-climatic conditions under which the soil have developed on the high terrace sedimentindicate that the soil should be classified as paleo-red soils.......... relict landform, high fluvial surface, paleo-red soil, rubefaction, desilicification. . : . ... ... ...

참고문헌 (Reference)

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