| Soil is an important part of the entire ecosystem,which provides a foundation for matter and energy cycling.Since the 30's of the 20th century, with the development of society and the progress of science and technology, industry and agriculture have developed rapidly, the scale of cities are growing, which leads to a lot of industry, agriculture and the contamination through different lines into the soil.These pollutants will cause the structure and functions of soil were injured and eventually cause the quality of the ecological environment damaged.Heavy metalpollutionis extremely grave.The reason is that heavy metal contaminated with the influence for a long time, Which is not easy decomposed in the material circulation and energy flow,and which cannot be decomposed by microbial.The heavy metal of soil mainly hurt human health through the chain of food or the dust of air.Zhangdiyingzi town is a state-level soybean , once the contamination of heavy metal in the soil is high,which will cause much hurt for plants. The content of Hg,As,Cd,Cr,Cu and Pb in different functional zones is studied in the paper, the relationship between heavy metals and different soil use and sampling depth is analyzed. The results indicated that the soil was contaminated by heavy metals, especially in the surface soil zones. The content of Hg is high and should be paid more attention. The soil is at clean level on the whole, so the soil meets the needs of producing green food and vegetables. |
