土壤和蔬菜中重金属含量的研究

西安市郊供试菜园土壤和蔬菜中金属元素含量差异显著,近郊9块菜地土壤全量和DTPA态Pb,Cd,Cr,Cu,Zn,Mn的平均含量均大于对照,其中Pb,Cd累积量较大。在研究的11种蔬菜中,苋菜和韭菜的重金属累积量较大,而大辣子和西红柿的累积量较小。蔬菜吸收重金属除受元素有效性影响外,还受土壤和大气污染的干扰。

Heavy Metal Contents in Vegetables and Soils

There was a significant difference in metal contents in soils and vegetables in vegetable gardens in Xian suburbs. Total contents and average contents of Pb, Cd, Cr,Zn and Mn of DTPA in soils of 9 pieces of vegetable fields in the near suburbs were higher than those in the control, of which Pb and Cd accumulated amounts were higher. Of 11 vegetables under study, the accdumulated heavy metals in amaranth and leek were high, which those in green pepper and tomtoes were low. Apart from the effect by the element availability, the uptakes of heavy metals by vegetables are subject to the interference from soil and atmosphere pollution.