Assessment of Electrical Conductivity of Saturated Soil Paste from 1:5 Soil‐Water Extracts for Reclaimed Tideland Soils in South‐Western Coastal Area of Korea
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초록
BACKGROUND: Measurement of electrical conductivity of saturated soil paste (ECe) for assessment of soil salinity is time‐consuming, and thus conversion of EC of 1:5 soilwater extract (EC1:5) to ECe using a dilution factor may be of help to monitor salinity of huge number of soil samples. This study was conducted to evaluate the dilution factor for reclaimed tideland (RTL) soils of South Korea. METHODS AND RESULTS: Soil samples (n=40) were collected from four RTLs, and analyzed for EC1:5, ECe, and cation compositions of 1:5 soil‐water extract. The dilution factor (8.70) was estimated by regression analysis between EC1:5 and ECe, and the obtained dilution factor was validated by applying to an independent data set (n=96) of EC1:5 and ECe. The ECe measured and predicted was strongly correlated (r2=0.74, P<0.001), but ECe was overestimated by 16% particularly for the soils with high clay content and low sodium adsorption ratio (SAR). CONCLUSION: This study suggests that using the dilution factor to convert EC1:5 to ECe is feasible method to monitor changes in the soil salinity of the study RTL. However, overestimation of ECe should be cautioned for the soils with high clay content and low SAR.
Abstract
BACKGROUND: Measurement of electrical conductivity of saturated soil paste (ECe) for assessment of soil salinity is time‐consuming, and thus conversion of EC of 1:5 soilwater extract (EC1:5) to ECe using a dilution factor may be of help to monitor salinity of huge number of soil samples. This study was conducted to evaluate the dilution factor for reclaimed tideland (RTL) soils of South Korea. METHODS AND RESULTS: Soil samples (n=40) were collected from four RTLs, and analyzed for EC1:5, ECe, and cation compositions of 1:5 soil‐water extract. The dilution factor (8.70) was estimated by regression analysis between EC1:5 and ECe, and the obtained dilution factor was validated by applying to an independent data set (n=96) of EC1:5 and ECe. The ECe measured and predicted was strongly correlated (r2=0.74, P<0.001), but ECe was overestimated by 16% particularly for the soils with high clay content and low sodium adsorption ratio (SAR). CONCLUSION: This study suggests that using the dilution factor to convert EC1:5 to ECe is feasible method to monitor changes in the soil salinity of the study RTL. However, overestimation of ECe should be cautioned for the soils with high clay content and low SAR.
참고문헌 (24)
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