重金属复合污染对大豆生长的影响及其综合评价研究

Impact of heavy metal combined pollution on soybean growth and its integrated assessment

通过正交试验设计研究了溶液培养条件下Ｃｄ、Ｐｈ、Ｃｕ、Ｚｎ、Ａｓ复合污染对大豆幼苗生长的影响．结果表明，复合污染条件下，各元素在根中的积累顺序为ＡＳ＞Ｐｂ＞Ｃｕ＞Ｃｄ＞Ｚｎ，茎叶中为Ｃｄ＞Ｃｕ＞Ｚｎ＞Ａｓ＞Ｐｈ，其交互作用类型决定于元素的投加浓度及其与共存元素的比例，而对其生长发育，ＡＳ和ＣＵ是主要的毒害元素，并指出相对离子强度是复合污染综合效应指示与控制的又一有效指标．

The impact of Cd,Pb,Cu, Zn and As combined pollution on soybean growth is studied with Hogland solution culture. The results show that under condition of combined pollution, the accumulation of heavy metals in root is in the order of As>Pb>Cu>Cd>Zn and that in stem and leaf is in the order of Cd>Cu>Zn>As>Pb. The type of their interaction is depended on the added concentration of elements and the proportion of coexistent ones. As and Cu are the main elements toxic to the growth of soybean. Relative ionic intensity is an effective index for indicating and controlling the integrated effect of combined pollution.