Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Micromorphological Characteristics of Soil with Different Patent Materials

모재별 토양의 미세형태 특성

  • Zhang, Yong-Seon (National Institute of Agricultural Science and Technology, RDA) ;
  • Jung, Seog-Jae (National Institute of Agricultural Science and Technology, RDA) ;
  • Kim, Sun-Kwan (National Institute of Agricultural Science and Technology, RDA) ;
  • Park, Chang-Jin (National Institute of Agricultural Science and Technology, RDA) ;
  • Jung, Yeon-Tae (National Institute of Agricultural Science and Technology, RDA)
  • 장용선 (농촌진흥청농업과학기술원) ;
  • 정석재 (농촌진흥청 농업과학기술원) ;
  • 김선관 (농촌진흥청 농업과학기술원) ;
  • 박창진 (농촌진흥청 농업과학기술원) ;
  • 정연태 (농촌진흥청 농업과학기술원)
  • Received : 2004.04.21
  • Accepted : 2004.07.20
  • Published : 2004.10.30
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Abstract

This experiment was conducted to investigate the direction or orientation of clay particle movement in argillic horizons (Bt) for clarifying the soil classification of soils. Soil samples were collected from 22 soil series containing Bt horizons. Physical and chemical characteristics and mineral and chemical compositions of clay in the soils were analyzed. Micoromorphological characteristics of the Bt horizons were also investigated with thin sections of the natural undisturbed and oriented soil samples. Average clay content in the Bt horizons was 28% and 1.33 times higher comparing to that in the surface layer. Soil pH was higher, but cation exchange capacity (CEC) and organic matter content were lower in Bt horizon than those in the surface layer. There was an evidence of clay accumulation in Bt horizons of all soil series examined except Bangog series. Although there was an increase of clay content in the horizons in Bangog series, the clay was not originated from illuviation process. The translocation of clay was in the order of an 2:1 expandable clay minerals > 2:1 non-expandable clay minerals > 1:1 clay minerals. The illuvial substances in argillic horizon were composed with clay, amorphous iron and opaque mineral. The micoromorphological features of Bt horizon were void coating, channel infilling and grain coating. There was an apparent boundary between clay coating and the groundmass in residuum and colluvium, but Bt horizon of alluvium was composed of a skew plane amputated by the physical operation.

우리나라 점토집적층 토양의 분류체계를 보완하고 점토집적의 미세형태를 구명하기 위하여 52개 점토집적층의 모재별로 20개 토양통을 대상으로 토양 층위별로 시료를 채취하여 토양의 이화학적 특성, 토양 중점토의 광물조성과 화학성분을 분석하였다. 미세형태에 관한 분석은 토양 원상시료를 채취하여 박편을 제작한 후 편광현미경을 이용하였으며 그 결과는 다음과 같다. 점토집적층의 점토함량은 28% 이상으로 표토의 점토함량에 비하여 평균 1.33배 높았으며, 토양의 pH는 점토집적층에서 높았으나 CEC는 유기물의 감소로 점토함량이 증가함에도 불구하고 표토보다 작았다. 모든 공시토양의 점토집적층에서 피막의 점토집적현상을 관찰할 수 있었으나 3기층 유래 반곡통 토양집적층의 점토함량의 증가에도 불구하고 점토집적현상을 관찰할 수 없었다. 점토광물 종류별 이동성 정도를 보면 팽창형 2:1 광물, 비팽창형 2:1광물, 1.1형광물의 순이었다. 점토집적층에서는 점토이외에 비정질의 철 또는 망간, 불투명 광물 및 유기물이 토양공극 표면피막, 토양공극 충진, 광물입자 외부피막 형성하고 있었다. 잔적토나 붕적토에서는 점토집적층과 토양기질 사이에 경계의 발달이 뚜렷한 반면에 충적토의 점토집적층에서는 점토함량이 높은 토양기질이 오랜 기간 외부로부터 물리적인 작용을 받아 절단된 배열면이 형성되었다.

Keywords

References

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