华中地区3种蔬菜对Cd的耐性和累积特性差异研究

Cadmium Tolerance and Accumulation in Three Vegetables in Central China

通过对华中地区3种常见蔬菜进行种子萌发试验和盆栽试验,对其在不同Cd浓度胁迫下的耐性和累积特性进行了比较研究.结果表明：蔬菜幼苗对过量Cd毒害的耐性强弱顺序是：萝卜Raphanus Sativus〉小白菜Brassicacampestris ssp.chinensi S.〉苋菜Amaranthus tricolour;Cd的施加质量比为5-10 mg·kg-1时,可促进小白菜和萝卜的生长,显著抑制苋菜的生长;蔬菜对Cd的富集系数为小白菜〉苋菜〉萝卜.因此,萝卜具有较强的抗土壤Cd污染的能力,比小白菜和苋菜更适合在Cd污染的农田上种植.

Cd stress tolerance and Cd accumulation in three vegetable species in central China were studied by seed germination test and pot experiment.Results showed that the sequence of the tolerance to Cd stress was radish,Chinese cabbage and amaranth.When the added Cd reached 5~10 mg·kg-1,the biomass of Chinese cabbage and radish increased significantly,while that of amaranth was obviously reduced.The order of Cd bio-concentration factors was as follow：Chinese cabbage,amaranth and radish,Cd was absorbed less by radish than by Chinese cabbage and by amaranth in same added Cd concentration,which indicated that the radish is more suitable to be planted in Cd-contaminated soils than the other two vegetables in central China for reducing Cd contamination risk in food web.