芒草狼尾草金盏菊对重金属铜的吸收及其体内积聚特征研究
毕业论文关键词：土壤重金属；植物修复；铜；污染修复；
Study on Absorb and Accumulate of Heavy Metal Cu in the Inner Characteristic of Three Common Plants
Abstract: Miscanthus, tall fern, common ornamental plant, some facilities more around the wild and survival, is a very promising energy plants; Pennisetum is a kind of robust root plant, in the arid soil of the plant has a good solid soil slope protection function; Calendula is a common flower-bed plant, on soil requirements is not high, can be a good growth in the drought, poor soil, and is a kind of element enrichment of heavy metals plants. At present，the soil heavy metal pollution is one of the main problem of pollution, its source mainly made from mineral weathering and human emissions of waste water, waste gas, waste residue in the metal elements, the heavy metal elements in the soil gathered themselves together, and gradually reduce the nature of the soil degradation ability, affect the fertility in soil, the growth of the crops, some enrichment of heavy metal elements more will make the soil can grow any crops again, affecting large areas of farmland in China. It has the characteristics of universality, concealment, table cohesion, irreversibility etc.. And the flow of heavy metals in the soil - plant system eventually through the maze into the human body, these are irreversible. This experiment by miscanthus, pennisetum and calendula three plants in contains three different types of Cu2+ concentration (600, 300, 150 mg/Kg) of soil with different period of time (a week or two weeks, three weeks, four weeks, two months) collected in the leaves of the concentration of copper ion elements analysis of the three plants in the absorption of heavy metals in the soil of copper is analyzed. Results show that under the same concentration of copper ion, different plants in different periods of copper ion absorption degree is different, and as time increases; Plants in the same circumstances, different concentration of plant uptake increased with increasing over time. At the same time, the absorption of different plants showed different concentrations, the highest absorbance of calendula, miscanthus and pennisetum is relatively weak.
Keywords: Petunia seed; light and salt stress; germination rate