發(fā)布時(shí)間：2024-07-06 23:04

　　植物修復(fù)是利用植物來(lái)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(fù)技術(shù),樹(shù)木修復(fù)是利用樹(shù)木進(jìn)行的植物修復(fù)。樹(shù)木,特別速生樹(shù)種,由于其生物量大、生長(zhǎng)率高、經(jīng)濟(jì)價(jià)值高、養(yǎng)分需求低、立地穩(wěn)定性好等優(yōu)點(diǎn),已成為解決重金屬污染的一種很有前途的方法。楊樹(shù)是一種公認(rèn)的重金屬提取樹(shù)種,也是一種速生樹(shù)種。樹(shù)木傾斜生長(zhǎng)在實(shí)際環(huán)境中時(shí)有發(fā)生,對(duì)于闊葉樹(shù)在傾斜生長(zhǎng)時(shí)其樹(shù)干會(huì)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(méi)有關(guān)于直立和傾斜生長(zhǎng)的樹(shù)木修復(fù)的比較研究。本研究選擇了69楊(Populus deltoides Bartr.cv.’Lux’(I-69/55)’),通過(guò)盆栽試驗(yàn)研究其在直立生長(zhǎng)和傾斜生長(zhǎng)下對(duì)鎘的提取修復(fù)能力。試驗(yàn)設(shè)有4個(gè)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(gè)不施Cd的對(duì)照處理,每個(gè)處理設(shè)立直立和45度角人工傾斜兩種生長(zhǎng)模式。每月測(cè)量樹(shù)高和地徑。在當(dāng)年的12月份對(duì)一年生和二年生直立和傾斜生長(zhǎng)的楊樹(shù)進(jìn)行了樹(shù)根和樹(shù)葉、樹(shù)皮和樹(shù)干木材(沿三個(gè)樹(shù)干高度),以及傾斜生長(zhǎng)楊樹(shù)樹(shù)干三個(gè)高...

【文章頁(yè)數(shù)】：63 頁(yè)

【學(xué)位級(jí)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(hào)：4002769