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常見植物對重金屬鉻的吸收及其體內積聚特征研究

時間:2019-05-24 22:48來源:畢業論文
研究鉻(Cr)在柳枝稷、白三葉草、芥菜三種常見植物植株吸收、積累規律,為鉻(Cr)污染土壤修復與防治提供一定的依據。實驗采用盆栽試驗,采用火焰分光光度計來測定在不同鉻(

摘要:    目前,重金屬鉻(Cr)污染嚴重危害生態環境和人類健康,這已然成為了一個世界性問題,對其進行有效的治理已刻不容緩。針對重金屬污染的修復技術,植物修復以其簡便、經濟、無二次污染等優點成為了佼佼者。本文研究鉻(Cr)在柳枝稷、白三葉草、芥菜三種常見植物植株吸收、積累規律,為鉻(Cr)污染土壤修復與防治提供一定的依據。實驗采用盆栽試驗,采用火焰分光光度計來測定在不同鉻(Cr)濃度環境下三種植株不同時間段所吸收的鉻含量,研究植株中鉻(Cr)吸收和累積的動態變化。本文還通過芥菜種子發芽毒性試驗,測定種子發芽情況,進行預測和評價環境污染物鉻對芥菜的潛在毒性和生物有效性。結果表明:1)三種植物均屬于非超積累植物。三種植物體內對鉻的積聚在前三周都呈現出上升趨勢,第四周分別呈現下降和持平的趨勢。三種植物對鉻的富集量都相當可觀,其中柳枝稷對鉻最大吸收量達到了710.71mg/kg,效果最佳。2)通過種子發芽試驗,發現低濃度的鉻對芥菜種子萌發影響不大,但是濃度高于250mg/L時,對發芽起到了抑制作用。本文為受污染的重金屬鉻土壤的生物修復提供理論和數據支持,并更進一步保護生態環境,對促進經濟可持續發展具有重要意義。35689
畢業論文關鍵詞:鉻污染;植物修復;吸收;積聚
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. 源¥自%六^^維*論-文+網=www.aftnzs.live
Keywords:    Chromium pollution; Phytoremediation; Uptake; Accumulation
目錄
摘要    ii
Abstract    iii
目錄    iv
1    引言    1
1.1    鉻在自然界中的分布    1
1.2    鉻污染及其來源    1
1.2.1    土壤中鉻的來源    1
1.3    鉻的危害    2
1.4    鉻的毒性檢測    2
1.5    植物修復    3
1.5.1    植物修復概念    3
1.5.2    植物修復進展    3
1.6    本研究的選題和意義    4 常見植物對重金屬鉻的吸收及其體內積聚特征研究:http://www.aftnzs.live/shengwu/20190524/33743.html
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