常见植物对重金属铬的吸收及其体内积聚特征研究
毕业论文关键词：铬污染；植物修复；吸收；积聚
Uptake and Accumulation of Chromium in three common Plants
Abstract: At present, heavy metals chromium（Cr）have engendered serious endanger to environment and people’s health, and it has become an international problem, so effective measures must be carried out instantly. For the remediation of pollution by heavy metal, phyoremediation has become the prominent due to its advantages of convenience, economy and no secondary pollution. It frequently occurs that the chromium（Cr）badly affects the growth of Switch grass, Shamrock and Leaf mustard. Controlling Cr uptake is a critical factor for three plants and its growth in Cr polluted environment. The regulation of Cr-uptake and accumulate in wheat plants during their growing were studied. Three plants were chosen to cultivate in the pot. In addition, this paper also sprouted toxicity tests by measuring seed germination, which predict and evaluate the potential toxicity of environmental pollutants chromium and availability of it. The results were as follows：1）these three plants were all non-hyper accumulators. Accumulation of Cr in three common plants was gradually rising in the first three weeks, and decreasing or steady in the last week. It’s considerable for three plants to absorb Cr. The accumulation quantity of Cr in Switch grass is 710.71mg/kg, which is the best of uptake. 2）By the seed germination tests, we found that mustard seed isn’t influenced by the low concentrations of Cr. However, when the Cr concentration is higher than 250mg/L, it inhibits its growth. This article has an important significant in sustainable development, and protect ecology further.
Keywords: Chromium pollution; Phytoremediation; Uptake; Accumulation
目录
摘要 ii
Abstract iii
目录 iv
1 引言 1
1.1 铬在自然界中的分布 1
1.2 铬污染及其来源 1
1.2.1 土壤中铬的来源 1
1.3 铬的危害 2
1.4 铬的毒性检测 2
1.5 植物修复 3
1.5.1 植物修复概念 3
1.5.2 植物修复进展 3
1.6 本研究的选题和意义 4
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