张家港市土壤-水稻系统重金属积累与转移特征分析

为了解张家港市土壤-水稻系统的重金属积累与转移情况,对城区外各处农田随机抽样,分析土壤-水稻系统的有关重金属残留,并对重金属的累积现状及生物富集情况对照相关国家标准进行分析、评价。研究表明,所有采样点的土壤重金属的综合污染指数值均小于0.7,和平村采样点水稻籽粒Cr轻度超标,且Cu、Zn的单因子指数值也最高,除此以外的样点水稻籽粒综合评价结果理想。水稻不同器官对同一重金属元素的富集能力不同,本研究中表现为根>叶>籽粒;水稻同一器官对不同重金属元素的富集能力也存在差异。

Assessment on Heavy Metals Accumulation and Transformation of Soil-rice System in Zhangjiagang City

In order to know heavy metals accumulation and transformation of soil-rice system in Zhangjiagang City, random sampling was collected in the farm outside urban area to text the contents of heavy metals in soil-rice system, then according to relative Chinese national standards, the pollution and biological enrichment situation of heavy metals were analysed and evaluated. The study found that the comprehensive pollution indexes of the soil were all lower than 0.7;The evaluation to heavy metal pollution of rice grain showed that in Heping Village, Cr was slight polluted and the single factor index of Cu and Zn were both higher than the other sampling sites. Except the sampling sites in Heping Villege, the rice grain quality was safe without pollution in study area. Different rice organ had different enrichment capability to heavy metals. The research showed the order of roof>leaf>grain. The same rice organ had different enrichment capability to different heavy metal element.