| Abstract | 第6-8页 |
| 摘要 | 第9-20页 |
| CHAPTER 1. INTRODUCTION AND REVIEW OF LITERATURE | 第20-51页 |
| 1.1 Potentially toxic trace elements (PTEs) | 第20-21页 |
| 1.2 Sources of potential toxic trace elements (PTEs) in the environment | 第21-24页 |
| 1.3 Global overview of PTEs pollution | 第24-26页 |
| 1.4 Chinese scenario of soil pollution | 第26-28页 |
| 1.5 Detrimental impacts of PTEs on public health and plants | 第28-33页 |
| 1.5.1 Zinc (Zn) | 第29页 |
| 1.5.2 Lead (Pb) | 第29-30页 |
| 1.5.3 Cadmium (Cd) | 第30-31页 |
| 1.5.4 Copper (Cu) | 第31页 |
| 1.5.5 Nickle (Ni) | 第31-32页 |
| 1.5.6 Mercury (Hg) | 第32页 |
| 1.5.7 Arsenic (As) | 第32页 |
| 1.5.8 Chromium (Cr) | 第32-33页 |
| 1.5.9 Aluminum (Al) | 第33页 |
| 1.6 Soil remediation techniques | 第33-36页 |
| 1.7 Phytoremediation and its importance | 第36-39页 |
| 1.8 Microbes assisted phytoremediation | 第39-41页 |
| 1.9 Streptomyces pactum for phytoremediation: A novel soil microorganism | 第41-47页 |
| 1.9.1 Fate of plants used in the phytoremediation of PTEs | 第42-43页 |
| 1.9.2 Immobilization of PTEs in polluted soil using organic amendments | 第43-44页 |
| 1.9.3 The nature of biochar and its potential to adsorb PTEs | 第44-46页 |
| 1.9.4 Limitations of biochar as soil amendment | 第46-47页 |
| 1.10 Effect of PTEs on enzyme activity | 第47-50页 |
| 1.10.1 Soil enzymatic activities affected by PTEs | 第47-49页 |
| 1.10.2 Plant antioxidant activities as function of soil contamination | 第49-50页 |
| 1.11 Research objectives | 第50-51页 |
| CHAPTER 2. MATERIALS AND METHODS | 第51-64页 |
| 2.1 Sites Description | 第51-52页 |
| 2.1.1 Tongguan (TG) | 第51页 |
| 2.1.2 Feng County (FC) | 第51-52页 |
| 2.1.3 Chenzhou (CZ) | 第52页 |
| 2.2 Materials Collection | 第52-54页 |
| 2.2.1 Collection of contaminated soil samples | 第52-53页 |
| 2.2.2 Isolation of Streptomyces pactum | 第53页 |
| 2.2.3 Raw materials for composting | 第53-54页 |
| 2.2.4 Biochar collection | 第54页 |
| 2.3 Experimental Methods | 第54-63页 |
| 2.3.1 Soil, compost and biochar analysis | 第54-58页 |
| 2.3.2 Plant analysis | 第58-63页 |
| 2.3.2.4 Determination of total PTEs content in plant samples | 第59页 |
| 2.3.2.5 Determination of antioxidant enzymatic activities in plant | 第59-62页 |
| 2.3.2.6 Measurement of MDA | 第62-63页 |
| 2.3.2.7 Phytoextraction indices | 第63页 |
| 2.4 Quality control and statistical analysis | 第63-64页 |
| CHAPTER 3. ROLE OF STREPTOMYCES PACTUM IN PHYTOREMEDIATION OF TRACE ELEMENTS IN MINE POLLUTED SOILS OF SHAANXI, NORTHWEST CHINA | 第64-82页 |
| 3.1 Introduction | 第64-65页 |
| 3.2 Materials and Methods | 第65-67页 |
| 3.2.1 Samples collection | 第65页 |
| 3.2.2 Experiment Methods | 第65-67页 |
| 3.3 Results and Discussion | 第67-81页 |
| 3.3.1 Characteristics of the studied soils and medical stone compost | 第67-69页 |
| 3.3.2 Effect of Streptomyces pactum on PTEs uptake by Brassica juncea | 第69-74页 |
| 3.3.3 Effect of Streptomyces pactum on growth attributes of Brassica juncea | 第74-77页 |
| 3.3.4 Effect of Streptomyces pactum on leaf antioxidant activities | 第77-79页 |
| 3.3.5 Phytoextraction indices of trace elements | 第79-81页 |
| 3.4 Conclusions | 第81-82页 |
| CHAPTER 4. USING BAMBOO BIOCHAR WITH COMPOST FOR STABILIZATION AND PHYTOTOXICITY REDUCTION OF TRACE ELEMENTS IN MINESCONTAMINATED SOILS OF SHAANXI PROVINCE, CHINA | 第82-102页 |
| 4.1 Introduction | 第82-84页 |
| 4.2 Materials and Methods | 第84-86页 |
| 4.2.1 Materials collection | 第84页 |
| 4.2.2 Experimental Methods | 第84-86页 |
| 4.3 Results and Discussion | 第86-101页 |
| 4.3.1 Characteristics of studied soils, medical stone compost and bamboo biochar | 第86-88页 |
| 4.3.2 Effect of biochar amendments on soil pH and EC | 第88-89页 |
| 4.3.3 Effect of biochar amendments on PTEs bioavailability | 第89-90页 |
| 4.3.4 Effect of biochar on PTEs translocation in Brassica juncea shoot | 第90-92页 |
| 4.3.5 Effect of biochar on PTEs accumulation in Brassica juncea root | 第92-93页 |
| 4.3.6 Phytotoxicity assay of Brassica juncea in polluted soils | 第93-96页 |
| 4.3.7 Effect of biochar on the soil enzymatic activities | 第96-97页 |
| 4.3.8 Effect of biochar on the plant antioxidant enzymes | 第97-100页 |
| 4.3.9 Phytoextraction indices of PTEs | 第100-101页 |
| 4.4 Conclusions | 第101-102页 |
| CHAPTER 5. INTEGRATED EFFECT OF STREPTOMYCES PACTUM (ACT12) AND BIOCHAR ON THE PHYTOEXTRACTION OF POTENTIAL TOXIC TRACEELEMENTS IN CONTAMINATED SOILS | 第102-129页 |
| 5.1 Introduction | 第102-104页 |
| 5.2 Materials and Methods | 第104-105页 |
| 5.2.1 Materials collection and Act12 isolation | 第104页 |
| 5.2.2 Experimental methods | 第104-105页 |
| 5.3 Results and Discussion | 第105-127页 |
| 5.3.1 Physico-chemical characteristics of soil, compost and biochar | 第105-108页 |
| 5.3.2 Effect of biochar and Act12 on soil pH and EC | 第108-110页 |
| 5.3.3 Effect of biochar and Act12 on bioavailable fraction of PTEs | 第110-111页 |
| 5.3.4 Effect of biochar and Act12 on phytoextraction of PTEs in sorghum shoots | 第111-115页 |
| 5.3.5 Effect of biochar and Act12 on phytoextraction of PTEs in sorghum root | 第115-117页 |
| 5.3.6 Plant growth promotion by biochar and Act12 | 第117-120页 |
| 5.3.7 Effect of biochar and Act 12 on the soil enzymatic activities | 第120-123页 |
| 5.3.8 Effect of biochar and Act12 on the plant anti-enzymatic activities | 第123-124页 |
| 5.3.9 Lipid peroxidation product | 第124-125页 |
| 5.3.10 Phytoextraction indices of PTEs | 第125-127页 |
| 5.4 Conclusions | 第127-129页 |
| SUMMARY AND MAIN CONCLUSIONS | 第129-131页 |
| SUGGESTIONS AND RECOMMENDATIONS | 第131-132页 |
| REFERENCES | 第132-150页 |
| NOMENCLATURE | 第150-152页 |
| ABOUT THE AUTHOR | 第152-153页 |
| PUBLISHED PEER REVIEWED PAPERS (SCI) | 第153-156页 |
