Cd污染下蒌蒿生长和Cd蓄积特性的研究

Growth and Cd Accumulation Properties of Seleng Wormwood in Cd-Contaminated Sandy Soil

以白蒿为试材，采用盆栽试验，研究了Cd污染砂土中白蒿的生态适应性以及Cd的蓄积特征。试验证实砂土中20-100mg／kg的CdCO3促进蒌蒿生长、提高叶绿素含量；120—240mg／kg的CdCO3影响蒌蒿生长，但单株干物重、分株数、叶绿素含量未降至对照水平；根、茎、叶中Cd含量与砂土中Cd含量成正比，根的积累最强，根，砂土Cd比值最大7．2倍，平均4．4倍；蒌蒿器官Cd含量顺序为根〉茎〉叶，根Cd含量最高达532．9mg／kg。

With Nanjing Baihao as a testing plant growing in pots of Cd-contaminated sandy soil, growth and Cd accumulation properties of the plant were investigated. Growth of the plant was promoted with chlorophyll concentration increased when the concentration of CdCO3 ranged from 20 to 100 mg/kg. And when the concentration reached 120 - 240 mg/kg in the sandy soil, the growth was slightly inhibited, but the dry matter and branches per plant and chlorophyll concentration were not reduced to the level of the control; Cd concentration in the root, stem and leaves of seleng wormwood was positive related to that of the sandy soil. Among these tissues, the roots accumulated most of the Cd in the plant, making Cd concentration therein upto 532.9 mg/kg, about 7.2 times or 4.4 times on average as much as in the maxium. In terms of Cd concentration, the tissues of the plant were in the following order, roots〉stems〉 leaves.