豆瓣菜在镉铅复合污染条件下的镉铅积累特性  

Cadmium and lead accumulation characteristics of watercress under cadmium-lead combined pollution

作　　者：王建兵 王金涛 颜可昕 郭小兰 王盾 戴洪文 WANG Jianbing;WANG Jintao;YAN Kexin;GUO Xiaolan;WANG Dun;DAI Hongwen(School of Life Science,Huizhou University,Huizhou 516007,Guangdong,China;School of Life Sciences,Sun Yat-sen University,Guangzhou 510631,China;School of Life Sciences,Zhaoqing University,Zhaoqing 526061,Guangdong,China)

机构地区：[1]惠州学院生命科学学院,广东惠州516007 [2]中山大学生命科学学院,广东广州510631 [3]肇庆学院生命科学学院,广东肇庆526061

出　　处：《浙江农业学报》2023年第11期2664-2672,共9页Acta Agriculturae Zhejiangensis

基　　金：广东省自然科学基金(S2011010004936,2022A1515111095);广东省教育厅科技特色创新项目(2018KTSCX214);广东省农村科技特派员重点任务派驻项目(KTP20200288);惠州学院教学质量工程项目(ZXKF2020009)。

摘　　要：为了弄清豆瓣菜在镉铅复合污染条件下对镉、铅的吸收积累特性,以前期试验筛选得到的镉高积累、低积累基因型为材料,采用镉铅复合污染土壤处理进行盆栽试验,研究镉铅复合污染对豆瓣菜地上部生物量,镉、铅含量与富集系数的影响。结果表明,在中度镉污染条件下(土壤全镉含量0.56~0.58 mg·kg^(-1)),中、高浓度铅处理下供试各基因型豆瓣菜地上部生物量(鲜重)的平均值均较低浓度铅处理显著(P<0.05)增加,增幅均为10.2%,说明土壤中一定浓度的铅促进了豆瓣菜的生长。供试的8个镉低积累基因型豆瓣菜的地上部镉含量和镉富集系数均显著低于镉高积累基因型。随着处理铅浓度的升高,各基因型豆瓣菜的地上部镉含量显著升高,说明土壤中的铅促进了豆瓣菜对镉的吸收和积累。豆瓣菜对铅的吸收和积累能力较弱,不论是镉高积累基因型还是低积累基因型,其地上部的铅富集系数均很小,最大值仅为0.075,在试验条件下的地上部铅含量均不超过国际食品法典委员会标准的限量值(0.3 mg.kg-1),可认为豆瓣菜受铅污染的风险较弱。In order to find out the cadmium(Cd)and lead(Pb)accumulation characteristics of watercress(Nasturtium officinale R.Br.)under Cd-Pb combined pollution,the high and low cadmium accumulation genotypes of watercress screened in prior tests were utilized in the present study,and the changes of aboveground biomass,Cd,Pb content and accumulation factor of watercress were examined via pot experiments.It was shown that the average aboveground biomass(fresh weight)of watercress under medium and high dose Pb treatment was significantly(P<0.05)increased both by 10.2%than that under low Pb treatment with medium Cd contamination(total Cd content in soil was 0.56-0.58 mg·kg^(-1)),which indicated that a certain concentration of Pb in the soil promoted the growth of watercress.The Cd content and accumulation factor in the aboveground part of low cadmium accumulation genotypes of watercress were significantly lower than those of high cadmium accumulation genotypes.With the increase of Pb concentration in soil,Cd content in the aboveground part of watercress was significantly enhanced,which indicated that Pb promoted the absorption and accumulation of Cd in watercress.However,the Pb uptake and accumulation of watercress were relatively low.The Pb accumulation factor of all the tested genotypes was small,as the maximum value was 0.075.Under the experiment conditions,the Pb content in the aboveground part of watercress was below the limit of the Codex Alimentarius Commission(CAC)standard.So,the risk of Pb contamination of watercress was generally low.

关 键 词：豆瓣菜 镉铅复合污染 重金属积累特性 

分 类 号：S636[农业科学—蔬菜学] X56[农业科学—园艺学]