Cd胁迫对白菜生理特征及元素吸收的影响研究  

Physiological Characteristic and Uptake of Cd, Nutritious Elements in Cabbage Grown on Cd-contaminated Soils

作　　者：方晓航[1] 曾晓雯[1] 于方明[1] 杜锁军[1] 刘雯[1] 仇荣亮[1] 

机构地区：[1]中山大学环境科学与工程学院,广东广州510275

出　　处：《农业环境科学学报》2006年第1期25-29,共5页Journal of Agro-Environment Science

基　　金：国家863计划项目(2001-AA-640501-03);国家自然科学基金(40571144);广东省重大科技专项项目(2004A30308002);教育部新世纪人才支持计划(NCET04-0790)

摘　　要：通过土培试验研究了Cd在白菜体内的富集以及对白菜的生理特征、营养元素吸收的影响。结果表明,Cd污染浓度的增大对白菜的株高、生物量并无显著影响,但白菜地上部以及地下部的Cd含量逐渐增加,地上、地下部最大Cd浓度分别为107.9mg·kg-1和135.4mg·kg-1。试验中除对照组之外,所有Cd处理土壤中生长的白菜对Cd的生物富集系数均大于1,表明白菜对Cd有一定的富集作用。Cd处理对白菜的叶绿素以及谷胱甘肽含量影响并不明显,两者均呈现降低-升高-降低的趋势,叶绿素与谷胱甘肽之间相关性显著(P<0.05)。Cd处理对白菜吸收Na、Mg可能存在促进作用(P<0.01),而对白菜吸收Mn可能存在拮抗作用(P<0.05)。白菜的叶绿素含量与Mg之间也存在显著正相关关系。By growing cabbage （Brassica pekinensis R） in Cd-contaminated soils, the uptake and translocation of cadmium in cabbage was studied to evaluate its potential harm to human health and provide a new approach for phytoremediation of cadmium in soils. No significant difference was observed in plant biomass and heights of the cabbages among different treatments of Cd. Cd content in plant shoots and roots increased with the increasing Cd addition, with the highest contents in shoot and mot reaching 107.9 mg·kg^-1 and 135.4 mg· kg^-1 respectively. Bioaccumulating factors （BF） of cabbage grown on Cd treated soils were greater than 1, indicating cabbage had an ability to accumulate Cd to a certain extent. Chlorophyl content and GSH content had a significant correlation, but they fluctuated with the increasing Cd contents in cabbage. Cd addition in soils might stimulate the uptake of Na and Mg in cabbage, but might decrease the uptake of Mn. Chlorophyl content and Mg content also exhibited a significant correlation.

关 键 词：镉 白菜 生理特征 营养元素 吸收 

分 类 号：X503.231[环境科学与工程—环境工程]