土壤重金属污染作物体内分布特征和富集能力研究

Distribution Characteristics and Concentration Abilities of Soil Heavy Metal Pollution in Maize

随着污水灌溉面积的持续扩大,研究污水灌溉带来的土壤重金属污染问题,特别是重金属污染物对土壤-作物系统的影响显得尤为重要.通过玉米作物污水灌溉实验、采样分析和生态调查,研究了由于污水灌溉造成的土壤重金属污染(Pb,Cd,Cr,Cu)在玉米体内分布特征和富集能力.研究结果证明,重金属Pb,Cr和Cu主要富集在玉米根部,少量向玉米作物地上部分迁移.玉米籽粒中4种重金属(Pb,Cd,Cr,Cu)的含量均在粮食及其制品中重金属元素限量之内,说明玉米籽粒基本没有受到污染,粮食生产处于安全状态.

With the development of wastewater irrigation, it is very important to study influence of heavy metal pollution, espetially influence of heavy metal pollution on soil-crop systems. Through experiment, sample analysis and ecological investigation, distribution characteristics and concentration abilities of soil heavy metal （Pb, Cd,Cr, Cu）pollution in maize, due to wastewater irrigation, were studied. It is shown that the heavy metal pollution was concentrated mainly in the roots, and A little part of the heavy metal pollution moves to the uppart of the maize. The content of four heavy metals （Pb, Cd, Cr, Cu） in maize grains is within the limited index of national food and the relevant product standard. It is proved that the maize grains are not polluted and food production is in safe condition.