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Computer Tomography as a Tool for Physical Analysis in an Anthropogenic Soil

  • Chun, Hyen Chung (National Academy of Agricultural Science, RDA) ;
  • Park, Chan Won (National Academy of Agricultural Science, RDA) ;
  • Sonn, Yeon Kyu (National Academy of Agricultural Science, RDA) ;
  • Cho, Hyun Joon (National Academy of Agricultural Science, RDA) ;
  • Hyun, Byung Keun (National Academy of Agricultural Science, RDA) ;
  • Song, Kwan Cheol (National Academy of Agricultural Science, RDA) ;
  • Zhang, Yong Seon (National Academy of Agricultural Science, RDA)
  • Received : 2013.11.04
  • Accepted : 2013.11.25
  • Published : 2013.12.31

Abstract

Human influence on soil formation has dramatically increased as the development of human civilization and industry. Increase of anthropogenic soils induced research of those soils; classification, chemical and physical characteristics and plant growth of anthropogenic soils. However there have been no reports on soil pore properties from the anthropogenic soils so far. Therefore the objectives of this study were to test computer tomography (CT) to characterize physical properties of an anthropogenic paddy field soil and to find differences between natural and anthropogenic paddy field soils. Soil samples of a natural paddy field were taken from Ansung, Gyeonggi-do (Ansung site), and samples of an anthropogenic paddy field were from Gumi in Gyeongsangnam-do (Gasan) where paddy fields were remodeled in 2011-2012. Samples were taken at three different depths and analyzed for routine physical properties and CT scans. CT scan provided 3 dimensional images to calculate pore size, length and tortuosity of soil pores. Fractal analysis was applied to quantify pore structure within soil images. The results of measured physical properties (bulk density, porosity) did not show differences across depths and sites, but hardness and water content had differences. These differences repeated within the results of pore morphology. Top soil samples from both sites had greater pore numbers and sizes than others. Fractal analyses showed that top soils had more heterogeneous pore structures than others. The bottom layer of the Gasan site showed more degradation of pore properties than ploughpan and bottom layers from the Ansung site. These results concluded that anthropogenic soils may have more degraded pore properties as depth increases. The remodeled paddy fields may need more fundamental remediation to improve physical conditions. This study suggests that pore analyses using CT can provide important information of physical conditions from anthropogenic soils.

Keywords

Anthropogenic soils;Computer tomography;Fractal dimension

Acknowledgement

Supported by : NAAS

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