污泥连续施用对玉米、小麦中Zn、Cd累积的影响

利用盆栽试验研究了连续2年施用重金属低污染和高污染污泥后,酸性土壤和碱性土壤中玉米、小麦中重金属Zn、Cd的累积情况,利用内梅洛综合指数法对植物中Zn、Cd的污染情况进行了评估。结果显示,添加重金属高污泥的处理中Zn、Cd含量明显高于其他处理,酸性土壤中添加污泥后植物中Zn、Cd要普遍高于石灰性土壤。污泥第一年施用后,玉米中Zn、Cd含量处于安全范围,第二年继续施加后,小麦中Zn、Cd含量属于轻度污染状况。连续大量地施用污泥,会产生农作物的重金属安全风险。

Effects of Sewage Sludge Continuous Application on Zn, Cd Accumulation Characteristic in Corn-Wheat

In order to make sure the Cumulative Risks of Zn, Cd in Crop after sewage sludge application for agricultural. A pot experiment was implemented over the past 2 years to study the heavy meals accumulation of Zn, Cd in Corn-Wheat. Two kinds of Sewage Sludge （Low contaminated and High contaminated） were applied into two different soil：Acidic Soil, Alkaline Soil respectively. N. L. Nemerow comprehensive index was used to assess the pollution of Zn, Cd in the Crops. The results indicated that Zn, Cd content was significantly higher than other treatments after adding high contaminated sludge. Sludge was added to the acidic soil causing the content of Zn, Cd in the plants was generally higher than to the alkaline soil. The corn of Zn, Cd content was in the safe range in the first year, the concentration reached the Light pollution the next year. A large amount of sludge continu- ously using could make heavy metals safety risk in crops.