석고 혼합량에 따른 간척지토양의 양이온 용탈 및 분포

국문 초록 (Abstract)

고염도 간척지 토양에서 석고시용에 따른 토양의 제염특성을 알아보고자 석고의 혼합비율별 토주를 제작하여 이온의 용출과 토양 중 이온 분포 특성을 조사하였다. 석고의 혼합비율별로 토주의 Ksat값을 측정한 결과, 석고 혼합 0%에서는 최종적으로 투수가 정지하여 Ksat 0 cm hr<SUP>-1</SUP>을 나타내었고, 석고 0.2% 혼합에서는 0.01 cm hr<SUP>-1</SUP>를 나타내었으며, 석고 0.4% 이상의 혼합에서는 투수성이 크게 증가하여 0.3 cm hr<SUP>-1</SUP> 이상의 Ksat 값을 나타내었다. 석고의 혼합비율별 용출액의 EC는 초기 104.2~164.8 dS m<SUP>-1</SUP>에서부터 141시간 용출 후 크게 감소하여 석고 혼합비율에 따라 0.1~0.6 dS m<SUP>-1</SUP>을 나타내었다. 석고 혼합비율별 토주 토양내 양이온 함량에 대한 용출된 각 양이온의 비율은 석고 혼합비율이 증가됨에 따라 모든 이온에서 증가하여 석고 혼합비 0.8% > 0.6% >0.4% > 0.2% 순을 나타내었다. 또한 모든 석고 혼합비율에서 토양내 양이온 함량에 대한 용출 양이온의 비율은 Na+ > Mg2+ > K+ > Ca2+ 순으로 높았다. 석고혼합토주의 용출 시험 후 토주내 토양의 EC는 시험 전33.9 dS m<SUP>-1</SUP>에 비해 98.8% 이상 저하되었다. 토양의 치환성 Ca2+는 크게 증가하여 석고 혼합비에 따라 1.7~3.1 cmolc kg<SUP>-1</SUP>의 함량을 나타낸 반면, 치환성 Na+, Mg2+,K+이온은 각각 1.1, 1.3, 0.6 cmolc kg<SUP>-1</SUP> 이하의 함량을 나타내었다.

다국어 초록 (Multilingual Abstract)

Serious problems in reclaimed land for agriculture are high soil salinity and very poor vertical drainage. However, desalinization in these soils is very difficult. To identify the change of soil permeability by the gypsum incorporation in soils we observed elution patterns and salt distribution of the soil using soil columns packed with reclaimed saline soil with various rates of gypsum amendment. Saturated hydraulic conductivity (Ksat) of the top soil of reclaimed saline soils without gypsum incorporation was close 0 cm hr<SUP>-1</SUP> while Ksat increased up to 0.3 cm hr<SUP>-1</SUP> with increasing amount of gypsum for 0.4% or more gypsum. Also Ksat of the reclaimed saline soils for top soil was drastically increased to 1.0 cm hr<SUP>-1</SUP> or slightly greater after 141 hour’s elution experiment. The cumulative amount of cation recovered in the effluent also increased in the order of gypsum incorporation rate 0.8% > 0.6% > 0.4 > 0.2%. Soil EC in soil columns decreased from initial 33.9 dS m<SUP>-1</SUP> to less than 0.4 dS m<SUP>-1</SUP> and exchangeable Ca 2+ increased by 32～140% according to gypsum incorporation rate.

목차 (Table of Contents)

• 서언
• 재료 및 방법
• 결과 및 고찰
• 적요
• 인용문헌

참고문헌 (Reference)

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