Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
권호 표지

Clay Mineral Composition of the Soils Derived from Residuum and Colluvium

잔적 및 붕적모재 토양의 점토광물 특성구명

  • Zhang, Yong-Seon (National Institute of Highland Agriculture, RDA) ;
  • Sonn, Yeon-Kyu (National Institute of Agricultural Science and Technology, RDA) ;
  • Jung, Sug-Jae (National Institute of Agricultural Science and Technology, RDA) ;
  • Lee, Gye-Jun (National Institute of Highland Agriculture, RDA) ;
  • Kim, Myung-Sook (National Institute of Agricultural Science and Technology, RDA) ;
  • Kim, Sun-Kwan (National Institute of Agricultural Science and Technology, RDA) ;
  • Lee, Ju-Young (National Institute of Agricultural Science and Technology, RDA) ;
  • Pyun, In-Hwan (Seosan Agricultural Technology Center)
  • Received : 2006.09.13
  • Accepted : 2006.10.13
  • Published : 2006.10.30
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Abstract

This experiment was conducted to investigate the distribution and compositions of clay mineral and to replenish the soil classification system in Korea. Soil layer samples were collected from 26 residuum and colluvium soil series out of 390 soil series in Korea, and then analyzed for soil physical and chemical characteristics, mineral and chemical compositions of clay in B horizon soils. Major clay minerals of residuum and colluvium were illite and chlorite in soils originated from the sedimentary rock such as limestone, shale, sandstone and conglomerate; quartz and kaolin in soils originated from rhyolite, neogene deposits, porphyry and tuff; and kaolin and quartz in the soils originated from granite, granite gneiss and anorthosite. Clay minerals in Korean soils were divided into 4 groups: mixed mineral group(MIX) mainly contained with illite, kaolin and vemiculite; kaolin group(KA) with kaolin and illite; chlorite group(CH) with chlorite and illite; and smectite group(SM) with kaolin, illite and smectite. The most predominant clay mineral group was kaolin group(KA) with kaolin and illite; an mixed mineral group(MIX) with illite, kaolin and vemiculite. Cation exchange capacity (CEC) of clay was low in the soils mainly composed with MIX and KA groups and silica-alumina molar ratio of clay was high in the soils composed with SM group

우리나라 토양의 분류체계를 보완하고 점토광물 조성과 분포를 파악하기 위하여 우리나라 390개 토양통 중 잔적 및 붕적토에서 유래된 26개 토양통을 대상으로 토양 층위별료 시료를 채취하여 집적층을(B층) 토양의 이화학적 특성, 토양 중 점토의 광물조성과 화학성분을 분석하였다. 잔적 및 붕적모재별로는 화강암과 화강편마암, 회장암에서 유래된 토양에서 kaolin과 quartz, 유문암, 3기층, 석영반암, 응회암에서 유래된 토양에서 quartz과 kaolin, 석회암, 혈암, 사암, 역암 등 퇴적암에서 유래된 토양에서 illite와 chlorite가 주요한 점토광물이었다. 토양통별 점토광물조성을 군집분석 (CA, cluster analysis)을 통하여 (1) illite, kaolin, vemiculite를 주광물로 하는 혼합점토광물군 (MIX), (2) kaolin을 주광물로 illite가 많은 kaolin군 (KA), (3) chlorite와 illite가 주광물인 chlorite군 (CH), (4) kaolin과 illite를 주광물로 smectite가 함유된 smectite군 (SM) 등 4개의 점토광물 조성군으로 구분하였다. 우리나라 토양의 대부분은 kaolin을 주광물로 하는 토양과 illite, kaolin, vemiculite가 함유된 토양이었으며, illite와 kaolin을 주광물로 하는 토양에서 CEC가 낮았고 vemiculite와 smectite가 함유된 점토에서 규반비가 높았다.

Keywords

References

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