重金属在小麦作物体中残留特征的田间试验研究

Field Experimental Study on the Residue of Heavy Metal in Wheat Crop

研究表明经污水灌溉后重金属铅、砷和镉在小麦植物体中的残留量因部位不同而有差异 ,但清水和污水灌溉对其总体残留特征无明显影响。其总的分布趋势是小麦根部的重金属累积量最大 ,其次是小麦的茎叶部 ,再其次是小麦的穗部 ,即小麦植株体内重金属积累量由大到小依次为根 >茎叶 >穗。因此认为根可作为一种屏障使重金属铅、砷和镉难于向上部迁移 。

The residual quantity of heavy metal such as Lead, Arsenic and Cadmium, varies greatly with different parts of the crop, which is highest in root, middle in stalk and leaves, and lowest in spike. The residue of heavy metal in wheat crop is not affected by sewage irrigation or fresh water irrigation. So it is considered that root which acts as a sort of barrier retards the upwards transport of heavy metal such as Lead, Arsenic and Cadmium, and protects the above ground parts of the crop from toxication. Heavy metal concentration in the spike of wheat crop meets the National Food Sanitation Standard.