Elution patterns and distribution of salts from multi-layer reclaimed soils with subsurface layer of porous granules in the newly reclaimed Saemangeum tidal area

摘要

This study was carried out to identify the elution patterns and distribution of salts from multi-layer reclaimed soils with a subsurface layer of porous granule in the newly reclaimed Saemangeum tidal area. To do this, paddy and upland plots were established with a layer of porous granule below the surface layer of the indigenous reclaimed soils at a depth of 30~60 cm. Soil samples were taken from the surface and subsurface (porous granule applied) layers at each plot to measure changes of EC of eachsoil layer at intervals of 1 month during the experiment. The results of EC measurements showed that in the paddy plot with porous granules EC of the top soil (0~30 cm) after 5 months rice cultivation was drastically decreased from 10.54 dS/m to 0.81dS/m while EC decreased from 5.74 dS/m to 0.82 dS/m in the control plot. In the upland plot, EC of top soil decreased from 18.08dS/m to 12.25 dS/m, while in the control upland plot EC value increased from 14.01dS/m to 28.41dS/m. From these results we couldassume that the porous granule layer placed at 30~60cm enhanced leaching of salts from the surface layer and cut off capillary rise of salts from the subsurface soil, resulting in lowering the level of salinity to values that would not affect any plant growth.