摘要
采用盆栽试验,分别向磁器口土样(土壤1)、校园土样(土壤2)中添加不同质量比的Cd及不同质量比的Zn+Cd(20 mg/kg),研究不同质量比外源Cd及Zn+Cd(20mg/kg)复合污染对两种土壤中绿豆苗株高及绿豆苗吸收Cd的影响。结果表明:单一外源不同质量比Cd污染绿豆苗时,生长期为7 d的绿豆苗株高较对照组有明显下降,随Cd污染加剧,绿豆苗生长受到抑制,随生长期延长而其危害加剧;随Cd污染的加剧,绿豆苗中Cd质量比增加,并呈正相关性,相同污染水平下,生长期为7 d的绿豆苗Cd质量比均大于生长期为3 d的;在不同污染水平下,土壤1的绿豆苗株高高于土壤2,其绿豆苗Cd质量比低于土壤2;Zn+Cd(20 mg/kg)复合污染时,株高较对照组矮,绿豆苗中Cd质量比随着Zn质量比增加而增加,呈正相关,表现为协同作用;对比土壤1和土壤2,土壤2的株高较低,但其绿豆苗中Cd质量比在不同水平下均高于土壤1。
The paper is aimed at presenting our pot-planting experi- ment results on the study of the effects of exogenous eadmium and zinc joined pollution on the vigna. Our experiments were done to in- vestigate the effects of various concentrations of exogenous Cd, （singly polluted and Zn ＋ Cd （20 mg/kg） combined-polluted） on the vigna radiated plant height and absorption of Cd in the two soils respective- ly. The results of our experiments show that under the condition of exogenous Cd single pollution, the height of vigna radiated plant tends to decrease significantly compared with the contrast group when the growing time is ruled as 7 days. However, compared with the blank group, vigna radiated height tends to decrease by l1.29%, 12.20%, 14.57%, 21.24%, 15.38% and21.24%, respective- ly. With the increase of Cd pollution, its height growth was also re- strained, but with the increase of the growing time the harm would be declined. In addition, with the increase of the Gd pollution, the Cd content in vigna radiate would increase in positive correlation with Cd pollution. At the same level of Cd pollution, it proved that the Cd content in the vigna radiate of 7 days tends to be higher than that of 3 days. To be exact, at different pollution levels, the plant height in soil sample 1 was found to be taller than that of in soil sample 2 whereas Cd content in vigna radiate body growing in soil sample 1 turned to be smaller than that of in soil sample 2. In the condition of Zn ＋ Cd （20 mg/kg） combined pollution, the plant height influence turned to be lower than the blank group. Moreover, when Cd content in the vigna radiate body increased with the increase of Zn＇s concen- tration, a positive correlation can be found in our experiments, indi- cating a synergistic behavior in the growth. Thus, comparing soil sample 1 and soil sample 2, it can be found that the plant height in soil sample 2 would be shorter, but, in soil sample 1, Cd content in vigna radiate tends to grow taller than that of in soil sample 2 at various levels.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2011年第5期11-14,共4页
Journal of Safety and Environment
基金
重庆市教育委员会科学技术研究项目(KJ08A05)
关键词
环境学
镉
锌
镉质量比
复合污染
协同作用
environmentalology
cadmium
zinc
cadmium content
compound pollution
synergistic effect
