The Study Of Magnetic Susceptibility And Spectral Reflectance As The Indication Of Polluted Soil In Chengdu Economic Region

Based on the results of multi-object researches,we sampled from six cities of Chen Du, De Yang, Mian Yang, Mei Shan, Le Shan and Ya An, including paddy soil and paddy seeds in each sample-point, amount to 60 paddy-soil and 60 paddy-seed samples . Additionally, we chose 14 soil profiles to research the changes and properties of the representative soils. We divided all the samples into 5 types: purplish soils, yellow-cinnamon soils, yellow-brown earths, hydromorphic paddy soil and percolated paddy soil. In our article, we use magnetic susceptibility and spectral reflectance methods to establish the correlation between the soil samples which contaminated by Cd, Hg and Pb etc and the respective values. Then we try to use the two methods to identify different soil types.These results demonstrate the potential of magnetic susceptibility for fast preliminary site assessment especially contaminated by the heavy metals just like Cadmium(Cd) and can identify the 5 different kinds of soils in values. Whereas, the visible wave band of spectral reflectance can indicate the concentration of the heavy metals,espically in the violet, blue wave band. Although the violet and orange wave band of spectral reflectance can identify the 5 types soils, the effect is not as well as magnetic susceptibility.Each wave band of TM and NIR have no correlation with the heavy metals and properties of 5 different soils.