模拟镉污染对小青菜和白萝卜生长及镉积累效应的研究

Study of Simulated-Cd-pollution on Growth and Acumulation of Cadmium in Green Vegetables and Radish

采用盆栽试验,选取小青菜和白萝卜为供试植物,模拟土壤镉污染,对不同镉浓度条件下两种蔬菜的生物量、镉含量及其对镉的吸收、富集状况进行了比较研究.将植物收获并进行微波消解,在波长为228.8nm时利用原子吸收光谱仪,分别测定植物地上部分和地下部分的镉含量,并计算富集系数和转运系数.结果表明,小青菜和白萝卜的生长都不同程度的受到了镉的抑制;随着土壤中镉处理浓度的不同,两种蔬菜对镉的吸收和富集特性不同,且叶菜类蔬菜通常对镉的吸收较多;随着土壤镉浓度的不断升高,两种蔬菜体内镉含量也不断增加,且同一蔬菜不同部位对镉的吸收积累特性也不同,小青菜比白萝卜吸收富集镉的能力强,且小青菜接近超富集植物的标准.通过盆栽试验模拟镉污染土壤研究小青菜和白萝卜对土壤中镉的吸收和积累效果,为镉污染的土壤植物修复技术及超积累植物的筛选提供参考.

Taking green vegetables and radish as the tested plants,this paper simulated Cd-pollution and studied the biomass and the content of cadmium of the two plants as well as their absorption and enrichment of cadmium in different density of cadmium.To harvest plant and dissolve by microwave,when the wavelength was 228.8 nm by atomic absorption spectrometer to determine the cadmium content of aboveground part and underground part of plant,and calculate the BCF and TF.The results showed that the growth of green vegetables and radish was inhibited by cadmium;The absorption and accumulation characteristics of cadmium of the tested plants was different when treated by doses of cadmium was different,and leafy vegetables usually absorbed more of the cadmium;?The Cadmium content in both vegetables increased with the increase of cadmium concentration in soil,the absorption and accumulation characteristics of cadmium in different parts of the same vegetable were different;The absorption and enrichment capability of cadmium in green vegetables is stronger than that of radish and green vegetables is close to the standard hyperaccumulator.Cadmium contaminated soil was simulated by pot experiments to study the effects of green vegetables and radish on cadmium uptake and accumulation in soil,it provides a reference for soil phytoremediation technology and screening of hyperaccumulator in cadmium contaminated soil.