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Changes in Chemical Properties of Paddy Field Soils as Influenced by Regional Topography in Jeonbuk Province
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 Title & Authors
Changes in Chemical Properties of Paddy Field Soils as Influenced by Regional Topography in Jeonbuk Province
Ahn, Byung-Koo; Lee, Jin-Ho; Kim, Kab-Cheol; Kim, Hyung-Gook; Jeong, Seong-Soo; Jeon, Hye-Won; Zhang, Yong-Sun;
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 Abstract
We investigated the changes in chemical properties of paddy field soils at 300 different sampling sites containing 4 topography in Jeonbuk province, Korea. The soil samples were collected 43.0% from local valley and fans, 39.3% from fluvio-marine deposits, 15.0% from alluvial plains, and 2.7% from diluvium sites. The optimal values of soil properties in the total soil samples were as follows: 65.3% of total samples in soil pH value, 48.3% of total samples in cation exchange capacity (CEC) value, and 22.3% of total samples in available phosphorus content, whereas the deficient values of soil properties were 63.3% of total samples in soil organic matter (SOM) content, 75.7% of total samples in available silicate content, and 61.3%, 51.0%, and 59.3% of total samples in exchangeable , , and concentrations, respectively. There were different soil types in the paddy fields: that is, 34.4% immature paddy and 33.6% sandy paddy in the local valley and fans, 57.8% sandy paddy in the alluvial plains, 47.4% normal paddy in the fluvio-marine deposits, and 75.7% immature paddy in the diluvium. Soil textures were also different: 53.5% loam in the local valley and fans, 37.8% sandy loam in the alluvial plains, and 55.1% silty loam in the fluvio-marine deposits. Soil pH and SOM contents were not different among the different topographical sampling sites. However, the mean value of available phosphorus content, 224 mg , was exceeded optimal values in the diluvium. The contents of exchangeable cations were optimal in all the sites, except exchangeable contents in the local valley and fans. The contents of available silicate ranged between 112 and 127 mg in all the sites, which were lower than optimal value. In addition, soil pH values were proportionally correlated to the order of available silicate, exchangeable , , , CEC, and exchangeable . The contents of SOM were proportionally correlated to the order of CEC, available , exchangeable , and available silicate. The contents of heavy metals, Cd, Cr, Cu, Ni, Pb, and Zn, were only 10% of the threshold levels of the metals, and As content was about 20 to 30% of the threshold level.
 Keywords
Topography;Paddy soil;Chemical property;Jeonbuk;
 Language
Korean
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