生菜对灰潮土重金属Cd Pb污染的反应与矿质元素吸收

以武汉市灰潮土为供试对象，研究了生菜对重金属Cd、Pb污染的反应和对矿质元素的吸收。结果表明：（1）Cd、Pb等重金属污染降低生菜的生物产量、可溶性糖和VC含量，且Cd影响更为明显；（2）生菜根和叶中含Cd、Pb的量均与污染土壤中Cd、Pb含量成正相关，Pb元素的存在能促进生菜对Cd的吸收，Pb主要积累在根部，Cd大部分积累在叶片中，且Pb促进Cd向地上部转移；（3）叶片鲜重与其Cd含量呈负相关；（4）Cd、Pb对其他矿质元素吸收存在不同程度的影响，且在作物不同部位影响的主要元素也不尽相同。

Effects of Lead and Cadmium on Quality of Lettuce Growing in a Polluted Grey Chao Soil and Uptake of Mineral Elements

Cadmium and lead are very toxic to crop growth and human health.The research on their compound influence on quality of vegetable and uptake of mineral elements is rather little up to date.Using Cd and Pb as stress factors,the effects of heavy metals polluted soils on lettuce production,quality and mineral elements assimilation were investigated in grey Chao soil collected from Wuhan.The results indicated: 1) Cd and Pb could decrease the biological mass and the contents of sugar and vitamin C in the leaves,and the influences of Cd were more serious.2) Content of Cd and Pb in lettuce had a positive correlation with their content in soils.Pb could increase the Cd assimilation by lettuce and mainly accumulated in lettuce roots,but Cd accumulated more in the leaves.The transfer of Cd was superior to Pb,and Pb could improve the transfer of Cd.3) The fresh weight of leaves had a negative correlation with the contents of Cd in lettuce leaves.4) Cd and Pb affected the absorption of other mineral elements to some extents,and the influences differed with the different absorption position.