甘薯对土壤中镉的吸收特征研究

目的 探究甘薯的镉吸收特征，为评估镉污染甘薯的质量安全风险提供依据。方法 在中度镉污染的地块间作甘薯、花生、大豆，检测叶、茎、皮/壳、肉/籽实等4个组织部位在生育期90 d、120 d、150d的镉含量，比较镉吸收差异。结果 3种作物的镉吸收能力依次为花生＞大豆＞甘薯，8个品种甘薯的镉含量均未超过限量标准，镉含量呈叶＞茎＞皮＞肉的规律，生育期150 d时地上部分茎叶的镉含量最高，而地下部分薯块的镉含量最低。结论 与花生和大豆相比，甘薯为低吸收镉作物，在中度及以下镉污染区域种植的甘薯，薯块食用安全风险低。

Cadmium uptake characteristic of sweetpotato from soil

Objective To explore the cadmium (Cd) uptake characteristic of sweetpotato from soil. Methods The Cd content in leaf, vine, peel/shell and flesh/seed of sweetpotato, peanut and soybean was detected at 90, 120, 150 d, then the cadmium absorption difference was compared. Results The Cd uptake capacity of the 3 crops was peanut>soybean>sweetpotato, and the Cd content of all 8 varieties of sweet potato did not exceed the limit standard. The Cd content was in the order of leaf>vine>peel>flesh. At the growth period 150 d, the Cd content in the aboveground part of sweetpotato was the highest, while that in the underground part of sweetpotato was the lowest. Conclusion Compared with peanut and soybean, sweetpotato is a low Cd uptake crop, and sweetpotato planted in moderate or low Cd polluted area has low quality risk.