Study On Regulations That Harmful Elements Are Absorbed In Soil-Crop (Rice, Wheat) System In The Four Sorts Of Irrigation Fields In The Suburb Of Zhenzhou City

The characters and regulations that the harmful elements are absorbed in the soil-crops (rice,wheat) system of the four sorts of irrigation fields in the suburb of zhcnzhou city was studied .The results showed that: some farm field had been polluted in the suburb of zhcnzhou city. The conpetence that the tissues of rice and wheat absorb harmful elements is root>stick and lcavcs>gaints. The conpetence of anti-pollution of rice is supercr than that of wheat. The root of rice absorbed Cd, Hg and As more powerful and the contents respectly arc 2.8011mg kg-1 ,0.0811mg-kg-1 and 22. 5741mg. kg-1 and 22.87 times, 2.43 times and 3.41 times than that of soil. The contents of harmful elements in stick and leaves of rice is lower and those in gains is lowest: Cd 0.0106mg. kg-1 , Hg 0.0310mg.kg-1 and As 0. 0876mg. kg-1. The root of wheat absorbed Cd, Pb and Hg very powerful. The contents of them respectly arc 2. 6450mg. kg-1 , 21. 7581mg. kg-1 and 0. 0998mg-kg-1rcspectly are 20.46 times > 1.12 times and 1.51 times than that of soil. The contents of harmful elements in stick and leaves of wheat are lower and those of gains are lowest.The contents of Cd, Pb and Hg respectly arc 0. 1991mg- kg-1 , 0. 9986mg-kg-1 and0.0024mg-kg-1. The speed that the conpel once of wheat tissues absorbing harmful elements went down is lower than that of rice. To some harmful elements, the conpetence of wheat gains absorption is superer than that of rice.The field irrigated by waste water and yellow river are seriously than those irrigated by well water and nature rain. The pollution of yellow river is not ignorable. The measures and the methods of preventing and curing pollution are posed. The black box model that the soil of farm fields is polluted by harmful elements is also posed in the paper.