干旱区污灌农田作物系统重金属Cd Pb生态行为研究

Behaviors of Heavy Metals (Cd and Pb) in Crops Grown in Land of Arid Regions Irrigated by Wastewater

通过对干旱区污灌农田主要农作物体中重金属 Cd、 Pb生态行为的调查研究得出：①不同作物对所选元素吸收累积的顺序为：玉米 >小麦；不同元素在作物体内迁移能力为： Cd>Pb。②作物不同部位元素累积态势为：根 >茎 >籽，这一态势不受土壤环境各元素含量高低的影响。③同一元素在不同剂量区作物体内吸收累积程度的差别显著。

Behaviors of selected heavy metals (Cd and Pb) in crops grown in land irrigated by wastewater were assessed through a field investigation of the toxic metals in arid zone. The following findings were obtained:① .The absorption sequence of the selected heavy metals in different crops was corn (Zea mays L.) > spring wheat (Triticum aestivum L.), and the transfer ability of element Cd was found to be more than that of element Pb;② .The accumulation order of the toxic metals in different parts of selected crops was: root>stem>grain;③ .There was a significant difference in accumulation magnitude for a same element in crops grown in the land with different trace metal content.