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植物對重金屬鎘的吸收及其體內積聚特征研究

時間:2019-04-08 10:13來源:畢業論文
摘要: 土壤是人類賴以生存的基礎,近年來我國土壤鎘污染日益嚴重,威脅著人類的生活健康,鎘污染的治理迫在眉睫。植物修復技術對改善重金屬污染土壤有重要的實踐意義。本實驗

摘要: 土壤是人類賴以生存的基礎,近年來我國土壤鎘污染日益嚴重,威脅著人類的生活健康,鎘污染的治理迫在眉睫。植物修復技術對改善重金屬污染土壤有重要的實踐意義。本實驗在三種濃度的鎘(5、11、22mg/kg)脅迫下進行,通過觀察種子在脅迫下萌發及幼苗生理特性的情況,以及魚腥草、雜交狼尾、芒草這三種生長成熟的草本植物對鎘的吸收能力、修復潛力分析,擬比較和篩選出能在鎘污染土壤中能良好生長,并對鎘超標土壤有改良作用的植物。結果表明,1、在種子萌發階段,低濃度的鎘對植物種子有促進萌發的作用,相對的,高濃度的鎘對植物種子有抑制萌發的作用;2、在植物成熟階段,隨著時間的推移,葉片中鎘的積累速率也存在差異,在7D時,葉中鎘含量增長速度較快,相比,在移栽14D之后,葉中鎘含量隨天數增長緩慢,在這之后至40D期間,葉片中鎘含量幾乎不再增加,可以認為葉片對鎘的吸收逐漸趨于飽和;3、魚腥草、雜交狼尾、芒草這三種草本富極植物對重金屬鎘污染土壤有一定的修復潛力,并以魚腥草最大,雜交狼尾和芒草次之。34393
畢業論文關鍵詞:鎘(Cd);土壤污染;重金屬;植物修復    
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 .
源¥自%六^^維*論-文+網=www.aftnzs.live

Keywords: Cadmium (Cd);Soil pollution; Heavy metals;Phytoremediation
目錄
摘要    2
Abstract    3
目錄    4
1 緒論    5
1.1土壤鎘污染的現狀與危害    5
1.1.1鎘污染的現狀    5
1.1.2鎘污染的危害    5
1.2鎘污染的背景值測定    6
1.3存在的問題    6
1.4植物修復技術基本概念    7
1.5超富極植物概念以及衡量標準    7
1.6國內外修復鎘研究進展    8
1.7本研究問題的提出與意義    9
2 材料與方法    10
2.1實驗材料介紹    10
2.1.1種子材料    10
2.1.2移植材料    10
2.2實驗材料的處理與培養    12
2.2.1種子培養皿培育、階梯濃度鎘脅迫處理    12
2.2.2三種植物盆栽移植,階梯濃度鎘脅迫處理    12
2.3種子活力的測定    12 植物對重金屬鎘的吸收及其體內積聚特征研究:http://www.aftnzs.live/shengwu/20190408/31875.html
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