대공극층위 형성 간척지 다층토주의 양이온 용탈 및 분포

To investigate desalinization patterns of surface reclaimed saline-sodic soil (RSSS) with subsurface layer of macroporous medium, multi-layered soil columns were constructed. For the multi-layered soil columns,gypsum was treated at the rate of 5 cmolc ㎏-1 in surface (top) while coal bottom ash (CBA) was placed into intermediate layer below the gypsum-treated surface soils followed by the reclaimed saline-sodic soil as bottom layer (BL). The lengths of top soil was 30 cm long while the lengths of the CBA were 20 and 30 cm long. The saturated hydraulic conductivities (Ksat) were 0.39x10-⁴ and 0.31×10-⁴ cm sec-¹ for RSSS(30cm)-CBA(20 cm)-BL(20 cm) and RSSS(30 cm)-CBA(20 cm)-RSSS(20 cm), respectively while the lowest Ksat. was 0.064x10-⁴ cm sec-¹ for RSSS(30 cm)-CBA(20 cm)+BL(20 cm). The time required to reach the lowest EC in eluent, 0.3 dS m-¹ from 33.9 dS m-¹ was shorter in multi-layered soil columns with GR-CBA than that of RS-SRS, representing that rate of desalinization was greater than 99%. Exchangeable Na decreased by 94.8~96.2 %, while exchangeable Ca increased by 98~129 %. KCI Citation Count: 3