Wu Wen-Fei, Nan Zhong-Ren, Wang Sheng-Li, Zhao Zhuan-Jun, Zhou Ting
Key Laboratory of Western China's Environmental Systems, Ministry of Education, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
Huan Jing Ke Xue. 2012 Sep;33(9):3253-60.
This paper investigated the effects of single Cd/Pb and Cd-Pb combined pollution of desert grey soils from the oasis regions on the uptake and translocation of Cd and Pb by rape (Brassica campestris L.), and analyzed the interaction between Cd and Pb. The results of pot experiment showed that the concentration of Cd or Pb was promoted when the concentration of Cd in soil was less than 7.0 mg x kg(-1) and the concentration of Pb in soil was less than 1 500 mg x kg(-1) in single Cd/Pb and Cd-Pb combined pollution. There was an obvious antagonism between Cd and Pb in Cd-Pb combined pollution. As the concentration of Cd in soil increased in single Cd pollution, the enrichment and translocation ability of Cd in rape was firstly improved and then reduced. As the concentration of Pb in soil increased in single Pb pollution, the enrichment and translocation ability of Pb in rape was reduced continuously. The Cd-Pb combined stress reduced the enrichment capacity of Cd and Pb as well as the migration ability of Pb, but improved the migration ability of Cd. The enrichment and translocation ability of Cd was greater than that of Pb. Models of uptake and translocation of Cd and Pb in rape under single Cd/Pb and Cd-Pb combined stress were both well fitted to quadratic equations.
本文研究了绿洲地区荒漠灰钙土中单一镉/铅及镉-铅复合污染对油菜（Brassica campestris L.）吸收和转运镉、铅的影响，并分析了镉与铅之间的相互作用。盆栽试验结果表明，在单一镉/铅及镉-铅复合污染中，当土壤中镉浓度小于7.0 mg·kg⁻¹且铅浓度小于1500 mg·kg⁻¹时，镉或铅的浓度会升高。镉-铅复合污染中镉与铅之间存在明显的拮抗作用。在单一镉污染中，随着土壤中镉浓度的增加，油菜对镉的富集和转运能力先提高后降低。在单一铅污染中，随着土壤中铅浓度的增加，油菜对铅的富集和转运能力持续降低。镉-铅复合胁迫降低了镉和铅的富集能力以及铅的迁移能力，但提高了镉的迁移能力。镉的富集和转运能力大于铅。单一镉/铅及镉-铅复合胁迫下油菜对镉和铅的吸收与转运模型均与二次方程拟合良好。
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