植物对重金属镉的吸收及其体内积聚特征研究
毕业论文关键词：镉（Cd）；土壤污染；重金属；植物修复
Study on the accumulation characters and absorb on Cd of common plants
Abstract: Soil is the basis of human survival ，in recent years, Soil Cd contaminated is increasingly serious, threating human’s health , cadmium pollution control is extremely urgent.Phytoremediation technology has important practice significance to improve the contaminated soil. The experiment examined the effect of cadmium stress on seed germination and physiological characteristics of seedling, planting three kind of plants under three concentrations of cadmium (5.5 / 11/22 mg / kg) stress, analyzing their ability to absorb heavy metals cadmium and the repair potential. Comparing and selecting some plants which can be well growing and having progressive effect on cadmium pollution soil based on theory by experiment. The results showed that，1， low concentrations of cadmium on the germination of plant seeds to promote the seed germination ，high concentration of cadmium could inhibit the seeds germination; 2, As time goes, leaves had different cadmium accumulation rate, in the 7D, the cadmium content in leaves grow faster than the 14D, the cadmium content in leaves of slow growth with the number of days in the period to 40D, after that cadmium content in leaves almost no increase, it is believed to absorb cadmium leaves gradually become saturated; 3, Herbaceous plant has some repair potential to the cadmium contaminated soil ，the effect on Houttuynia is better than Hybrid wolf tail and Miscanthus .
Keywords: Cadmium (Cd);Soil pollution; Heavy metals;Phytoremediation
目录
摘要 2
Abstract 3
目录 4
1 绪论 5
1.1土壤镉污染的现状与危害 5
1.1.1镉污染的现状 5
1.1.2镉污染的危害 5
1.2镉污染的背景值测定 6
1.3存在的问题 6
1.4植物修复技术基本概念 7
1.5超富极植物概念以及衡量标准 7
1.6国内外修复镉研究进展 8
1.7本研究问题的提出与意义 9
2 材料与方法 10
2.1实验材料介绍 10
2.1.1种子材料 10
2.1.2移植材料 10
2.2实验材料的处理与培养 12
2.2.1种子培养皿培育、阶梯浓度镉胁迫处理 12
2.2.2三种植物盆栽移植，阶梯浓度镉胁迫处理 12
2.3种子活力的测定 12
上一篇：弗吉尼亚栎的扦插繁殖技术研究