再生水滴灌土壤和植物中重金属积累分布研究

Study on Accumulation and Distribution of Heavy Metals in Soil and Plant under Reclaimed Water Drip Irrigation

对白菜和萝卜进行再生水滴灌大棚试验,与地下水滴灌为对照,分析研究了再生水滴灌后土壤和植物地下及地上部分中重金属积累分布情况。结果表明:重金属主要在土壤表层(0~40 cm深度处)积累,浓度随深度降低,40~80 cm深度处无明显差异,80~100 cm深度处重金属含量突增,浓度最高,100~180 cm深度处重金属含量急剧降低,180~220 cm深度处重金属浓度无差异。对植物地下及地上部分进行研究,发现再生水滴灌使白菜和萝卜地上部和根系中Pb^(2+)、Cu^(2+)、Cd^(2+)的含量增加显著。

Through a reclaimed water drip irrigation greenhouse experiment of Chinese cabbage and radish, with underground drip irrigation as contrast, the heavy metal accumulation distribution in the soil, overground and underground part of plant after drip irrigation are analyzed. The results show that the main heavy metals in the soil surface （0 to 40 cm depth） accumulation decreases with depth; there is no obvious difference between 40 to 80 cm depth; heavy metal content in 80 cm to 100 cm depth increases suddenly and the concentration of heavy metals is the highest; heavy metal content in 100 to 180 cm depth drastically reduces; there is no difference in the 180 to 220 cm depth. Under reclaimed water drip irrigation, the content of Pb2＋, Cu2＋ and Cd2＋ in the aboveground and underground parts of Chinese cabbage and turnip increase significantly.