不同麦田土壤类型中重金属含量及其变化研究

为监测小麦无公害生产基地的土壤质量保证优质小麦的安全生产，研究不同土壤类型和质地对土壤重金属含量的影响。在大田条件下，研究了不同土壤类型和质地小麦播种前、拔节期和收获期土壤pH值、土壤中重金属砷、铅、汞、铬、镉等重金属的动态变化。结果表明：各项重金属含量的实测值均未超标；土壤重金属含量以拔节期最高；拔节期和收获后与播种前相比,对5种重金属除汞之外的含量影响差异性显著；不同土壤质地对重金属含量的影响差异性不显著。鹤壁市小麦示范区可作为优质小麦安全生产基地，要加强对小麦拔节期土壤重金属含量的监控。

Study on the Dynamic Changes of Heavy Metals Contents under Different Soil Types of Winter Wheat

In order to assure safety and high quality wheat production and study the effects of heavy metals on different soil types and qualities, the dynamic changes of As, Pb, Hg, Cr and Cd contents were determined in different periods (before sowing, elongation and after harvesting) in field according to different soil types and qualities. The results showed that the average contents determined in soils didn't exceed the criterion of National Standards, the highest contents of heavy metals in soil were gotten during elongation stage, and the effects of elongation stage and after harvesting sample stages on the contents of heavy metals reached the significance level compared with before sowing except Hg. The effects of different soil qualities on the contents of heavy metals didn't reach. The demonstration area in Hebi city was suitable for safety and high quality wheat production. The monitoring on the contents of soil heavy metals should be paid more attentions in elongation stage of wheat.