凤眼莲在稀土废水中的生长研究
时间:2017-05-14 21:30 来源:毕业论文 作者:毕业论文 点击:次
| 摘要分别从叶绿素含量、植物抗氧化活性、植物酶活性及丙二醛含量等方面测定分析放射性稀土废水对凤眼莲的影响，研究在放射性稀土废水影响下凤眼莲的生理指标变化，以期为寻找合适的方法减轻放射性稀土废水等污染对植物的危害，为稀土矿区的生态修复和污染治理提供参考性依据。实验结论如下： （1）随着稀土废水浓度的增加，对植株叶绿素含量的抑制作用增强。 （2）稀土废水溶液短期时间内增强了细胞清除活性氧的能力，减轻稀土废水对叶部活性氧清除系统造成的损伤，减轻了对植株叶部伤害程度。但是长时间或受高浓度稀土废水影响后，破坏作用明显增强，抑制抗氧化酶活性。 （3）由于凤眼莲对重金属的吸附90%集中在根部，放射性稀土废水对根部一般表现为破坏作用增强，抑制抗氧化酶活性。 （4）随着稀土废水浓度增加和培养时间的延长，在脂质抗过氧化和膜系统防护上稀土元素促进作用逐渐超过放射性的胁迫作用。 （5）为植株施加肥料能够有效的促进植物在放射性稀土废水溶液的影响下文持正常的生理机能，抵抗不良影响。 （6）凤眼莲能够吸附放射性元素，降低水体放射性。加入适量肥料能够促进凤眼莲对放射性元素的吸附。 关键词 放射性稀土废水 凤眼莲 叶绿素 抗氧化活性 植物酶活性 丙二醛含量 毕业设计说明书（论文）外文摘要 Title The Study of the Growth of Eichhornia Crassipes in Radioactive Rare Earth Wastewater Abstract In order to research the physiological indicators’ variations of eichhornia crassipes in rare radioactive wastewater, the assaying chlorophyll, antioxidative activity, enzymatic activity and malondialdehyde are respectively analyzed. The purpose is to search right way to reduce the dangers to plants from pollution of radioactive waste water and provide references for ecological restoration and pollution control of rare earth mining area. The experimental results are as follows: (1)The inhibition on chlorophyll content is strengthened with the increasing concentration of wastewater. (2) The ability of active oxygen removal in cells in short time was enhanced by rare earth wastewater. The damage to the active oxygen scavenging system of plant leaves caused by rare earth wastewater is reduced. So the degree of damage to plant leaves is reduced. But the damage is obviously enhanced and antioxidant enzyme activity is inhibited with effects of long time or the high concentration of rare earth waste water. (3)The damage to root is enhanced and antioxidant enzyme activity is inhibited. Because 90 percent of the adsorption of heavy metals in eichhornia crassipes is concentrated in root. (4)With the increasing concentration of rare earth waste water and the extension of time, the promotion of rare earth elements becomes bigger gradually than the stress of radioactivity in terms of the effect of lipid peroxidation and the protection of membrane system. (5)The ability of maintaining normal physiological function of plant is effectively promoted under the influence of radioactive rare earth wastewater because of fertilization in order to resist bad influences. (6)Eichhorina crassipes can adsorb radioactive elements, reduce radioactivity of water. The adsorption of radioactive elements is promoted because of appropriate amount of fertilizer. Keywords radioactive rare earth eichhornia crassipes chlorophyll antioxidative activity enzymatic activity malondialdehyde 目 录 目 录 1 1 绪论 3 (责任编辑：qin) |