Study On Soil Polluted By Heavy Metal Of Main Agricultural Product Habitat In Hengyang County

With the society and economic development, the problem of environmental pollution is outstanding day by day. The soil is regarded as an important component of the environment. The soil pollution, especially the soil heavy metal pollution arouses people's widespread interest. After the soil is polluted by the heavy metallic element, these harmful elements will enter finally the human body through the food chain, which will do harm to the human health. By monitoring the county's representative soil including the samples of the watermelon earth, the vegetables earth, the grape earth, the Chinese chestnut earth, the peach tree and the plum tree earth, the citrus fruits earth and the paddy earth, all of which are 237, this article studies the state of its soil heavy metal pollution . The results indicate: â‘  In this county , the soil environment of the producing area of the main agricultural product is good overall. All of the 237 kinds of soil, there are 57 kinds which have already been polluted by the heavy metallic element, the pollution rate of soil is 24.05%. â‘¡ In Hengyang county, the main agricultural product habitat soil polluted by heavy metal take the one polluted the cadmium element as the focus. It occupies the polluted soil samples 70.18% which relates the cadmium polluted â‘¢The single metal pollution is the most main pollution in the main agricultural product habitat of Hengyang county. In 57 kinds of the polluted soil samples, there are 49 kinds of soil belonging to the single metallic element pollution ,which occupies the polluted soil sample 85.96%.There are 6 kinds of soil samples which are polluted by 2 kinds of heavy metals elements effecting together, it occupies the polluted soil sample 10.53%. There are 2 kinds of soil sample which are polluted by 3 kinds of heavy metals elements effecting together, which occupies the polluted soil samples 3.51%.â‘£ In seven kinds of crops soil sample, the first is the four kinds of crops' soil as the grape earth, the Chinese chestnut earth, the peach tree and the plum tree earth, the citrus fruits earth, which are protected well and have not been polluted by heavy metal. The second is the watermelon earth, which has 3 kinds of the polluted soil samples, occupying the measured of its samples 10.71%. The third is the vegetables earth, which has 5 kindsof the polluted soil samples, occupying the measured of its samples 17.24%. The paddy soil is protected worst, which has 49 kinds of the polluted soil samples in the 150 kinds of soil samples, occupying the measured of its samples 32.67%.