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[目的]为了探讨探讨Pb、Cd单一及复合胁迫下桂花幼苗的吸收积累特性。[方法]采用土壤盆栽试验法,以桂花幼苗为对象,选择重金属Pb在浓度梯度0、50、100、500、1000和2000mg/kg,Cd在浓度梯度0、1、10、50、100和200mg/kg/条件下,研究了不同浓度Pb、Cd单一及复合胁迫对桂花幼苗生长的影响。[结果]在试验条件下,土壤Pb含量达到500mg/kg时显著抑制桂花幼苗的生长,土壤Cd含量达到100mg/kg时显著抑制桂花幼苗的生长。桂花幼苗各部分对Pb吸收量的大小顺序为根>茎>叶;各部分Cd含量的大小顺序为根>茎>叶,但是各部分对Cd吸收量的大小顺序为茎>根>叶。[结论]在复合胁迫中,低浓度Pb、Cd处理表现出相互促进吸收积累,高浓度处理表现出相互抑制吸收积累的特性。
[Objective] The aim was to discuss the absorption and accumulation characteristics of Osmanthus fragrans seedlings under single and combined stress of Pb and Cd. [Method] The soil pot experiment was used to study the seedlings of Osmanthus fragrans. The heavy metal Pb was selected at the concentration gradients of 0, 50, 100, 500, 1000 and 2000 mg / kg, Cd in the concentration gradient of 0, / kg /, the effects of single and combined stress of different concentrations of Pb and Cd on the seedling growth of Osmanthus fragrans were studied. [Result] Under the experimental conditions, when the content of Pb in soil reached 500mg / kg, the seedling growth of Osmanthus fragrans was significantly inhibited. When the soil Cd content reached 100mg / kg, the growth of Osmanthus fragrans seedling was significantly inhibited. The order of Pb uptake by each part of osmanthus fragrans seedlings was root> stem> leaf. The order of Cd content in each part was root> stem> leaf, but the order of Cd uptake by each part was stem> root> leaf. [Conclusion] Under the combined stress, Pb and Cd treatments at low concentrations showed mutually enhanced absorption and accumulation, while those at high concentrations showed mutually inhibited absorption and accumulation characteristics.