铅和镉复合胁迫对玉米吸收铅特性及产量影响

盆栽条件下,以富友1号玉米品种为试验材料研究铅、镉复合胁迫下,玉米对铅的吸收特性及产量影响。结果表明,复合污染条件下,铅在玉米体内分布的一般规律是根>下叶>茎>上叶>子粒,且植株根铅含量低于铅单因子污染。但在同浓度铅处理条件下,随土壤中投放镉浓度由0～40mg/kg的增加,植株根铅含量呈升高趋势。从玉米的生育进程来看,玉米在3个生育时期内的铅含量分配特点是成熟期>拔节期>开花期。

Effect on Absorption Characteristics of Lead and Yield in Maize Under Combined Stress of Lead and Cadmium

This paper studied the absorption characteristics of lead in maize and its yield with the variety Fuyou 1 grown in pots under the combined stress of lead and cadmium. The results of experiment showed that under condition of combined pollution, the laws of accumulation of lead in maize were in the order of root > down-leaf > stem > up-leaf > grain and root lead contents were lower than that under condition of single lead pollution. However, lead contents increased under the condition of same lead stress with cadmium contents increasing from 0 mg/kg to 40 mg/kg in soil. From the growing stage, the laws of accumulation of lead in maize were in the order of ripening stage>jointing stage>flowering stage.