摘要
烤烟(Nicotiana tabacumL.)吸Cd能力较强,人们通过吸烟可吸入大量的Cd,对健康造成一定的危害。本试验采用室内盆栽方法,研究了不同浓度Cd(0、1、3、5、10mg·kg-1)和Zn(0、100mg·kg-1)处理对烤烟生长以及体内Cd、Zn含量的影响。结果表明,在没有加Cd的处理,烤烟上部叶、中部叶和下部叶含有一定浓度的Cd,说明烤烟具有较强的吸收和累积Cd的能力。烤烟叶片叶绿素a、叶绿素b、生物量随土壤Cd加入量的增加而显著下降,但Cd加入量为1mg·kg-1的处理与对照相比差异不大;Zn处理可缓解Cd处理造成的毒害,增加烟株的生物量,减少了烟株不同部位Cd的浓度。Cd在烤烟体内各器官中的累积量随土壤Cd浓度的增高而增大,且体内各器官Cd含量次序为:叶>根>茎;在不同部位叶的含量顺序为:下叶>中叶>上叶。从结果中可以看出,Zn抑制了Cd对烤烟的作用,从而可以通过在土壤中施加适量锌肥的措施,来降低烤烟对Cd的吸收和烟叶中Cd含量,从而减少其危害。
Compared to other crops, tobacco can accumulate relatively high levels of Cd. Cd accumulation in crop plants such as tobacco can lead to human exposure to this carcinogenic metal. Cd and Zn were added to the unpolluted soil with Cd concentration of 0,1,3,5,10 mg·kg^-1 and Zn concentration with 0,100 mg· kg^-1, respectively, and stabilized for 60 days in the pot experiment. One tobacco seedling was transplanted to each pot containing 5 kg soil. The results showed that the content of chlorophyll a,chlorophyll b in leaves of tobacco,dry weights decreased significantly with the increase of added Cd except for the treatment of 1 mg·kg^-1 Cd. Zn enhanced the growth of tobacco plant and decreased Cd concentration. The concentrations of Cd in different parts of tobacco increased with the increase of Cd added in the soil. The concentration of Cd in different parts of tobacco followed the orders： leaf〉root〉stem; lower leaf〉 middle leaf 〉 upper leaf. There was a competition system both for Zn and Cd uptake, which is useful to minimize the Cd uptake through Zn application in the field.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2007年第2期713-717,共5页
Journal of Agro-Environment Science
关键词
烤烟
镉
锌
生长
tobacco
cadmium
zinc
growth
