植物修復是利用植物來移除環(huán)境中的污染物或者是使其穩(wěn)定或降低毒性的污染修復技術(shù),樹木修復是利用樹木進行的植物修復。樹木,特別速生樹種,由于其生物量大、生長率高、經(jīng)濟價值高、養(yǎng)分需求低、立地穩(wěn)定性好等優(yōu)點,已成為解決重金屬污染的一種很有前途的方法。楊樹是一種公認的重金屬提取樹種,也是一種速生樹種。樹木傾斜生長在實際環(huán)境中時有發(fā)生,對于闊葉樹在傾斜生長時其樹干會形成應(yīng)拉木。應(yīng)拉木具有一些的特殊木材結(jié)構(gòu),如纖維素含量高的膠狀層,微纖絲束間的微孔較多,可能有利于重金屬的積累。但目前還沒有關(guān)于直立和傾斜生長的樹木修復的比較研究。本研究選擇了69楊(Populus deltoides Bartr.cv.’Lux’(I-69/55)’),通過盆栽試驗研究其在直立生長和傾斜生長下對鎘的提取修復能力。試驗設(shè)有4個不同濃度Cd添加的處理,分別為5、20、50和100 mg/kg干土,再加上一個不施Cd的對照處理,每個處理設(shè)立直立和45度角人工傾斜兩種生長模式。每月測量樹高和地徑。在當年的12月份對一年生和二年生直立和傾斜生長的楊樹進行了樹根和樹葉、樹皮和樹干木材(沿三個樹干高度),以及傾斜生長楊樹樹干三個高...

【文章頁數(shù)】：63 頁

【學位級別】：碩士

【文章目錄】：
摘要
Abstract
1 Literature reviews
    1.1 Toxic metal on biological system
    1.2 Remediation of heavy metal contaiminated environment
    1.3 Bioremediation
        1.3.1 In situ bioremediation
        1.3.2 Ex situ bioremediation
    1.4 Phytoremediation and challenges in phytoremediation
    1.5 Phytoextraction by fast-growing trees
    1.6 Dendroremediation of heavy metal polluted soils
2 Introduction
    2.1 The heavy metal Cadmium
    2.2 Trees for dendroremediation
    2.3 Normal wood and tension wood
    2.4 Research object and theoretical framework
3 Material and method
    3.1 Soil preparation
    3.2 Planting and cadmium treatments
    3.3 Measuring and water management
    3.4 Sampling pre-treatment and analysis
    3.5 Calculation and data analysis
4 Result and discussion
    4.1 Effect of Cd stress on poplar growth
    4.2 Cd distributions in different parts of poplar
    4.3 Cd content in the trunk parts of poplar trees along the height
    4.4 The radial distribution of Cd in trunk of popular trees
    4.5 Cd content in the two trunk zones of the leaning poplar trees
    4.6 BCF
    4.7 TF
5 Conclusion
Acknowledgements
References
Personal information



本文編號：4002769