| Abstract | 第6-8页 |
| 中文摘要 | 第9-11页 |
| Table of abbreviations | 第11-17页 |
| Chapter 1 Introduction | 第17-25页 |
| 1.1 Research objectives and significance | 第17-18页 |
| 1.2 Research Contents | 第18-22页 |
| 1.2.1 Research contents | 第18-19页 |
| 1.2.2 Research Scheme | 第19-21页 |
| 1.2.3 Technology roadmap | 第21-22页 |
| 1.3 Research schedule | 第22页 |
| 1.4 Expected objectives and Innovation | 第22-25页 |
| 1.4.1 Expected objectives | 第22页 |
| 1.4.2 Innovations | 第22-25页 |
| Chapter 2 Literature Review | 第25-35页 |
| 2.1 Situation of heavy metal contamination in soil | 第25-26页 |
| 2.2 Heavy metal contamination in vegetables | 第26-27页 |
| 2.3 Speciation of heavy metals | 第27-29页 |
| 2.3.1 Metal speciation in soil | 第27-28页 |
| 2.3.2 Metal speciation in plant | 第28-29页 |
| 2.4 Heavy metal control in soil-plant system | 第29-33页 |
| 2.5 Research ideas | 第33-35页 |
| Chapter 3 The total content and speciation of heavy metals in common vegetable andcorresponding soil from Jijie Town,Gejiu city | 第35-63页 |
| 3.1 Introduction | 第35-37页 |
| 3.2 Materials and methods | 第37-41页 |
| 3.2.1 Study area | 第37-38页 |
| 3.2.2 Sample collection and pre-trearment | 第38页 |
| 3.2.3 Sample analysis | 第38-40页 |
| 3.2.4 Data statistics | 第40-41页 |
| 3.3 Results | 第41-56页 |
| 3.3.1 Physical-chemical properties and heavy metals in soil | 第41-43页 |
| 3.3.2 Heavy metals in different tissues of vegetables | 第43-47页 |
| 3.3.3 Accumulation and transfer factor of vegetables | 第47-50页 |
| 3.3.4 Cluster analysis of vegetables | 第50-51页 |
| 3.3.5 Chemical forms of heavy metals in vegetables | 第51-53页 |
| 3.3.6 Evaluation of heavy metals in vegetables and health risk | 第53-56页 |
| 3.4 Discussion | 第56-60页 |
| 3.4.1 The total heavy metal concentrations and their bioavailability in soil | 第56页 |
| 3.4.2 The difference of accumulation and transfer factor in vegetables | 第56-58页 |
| 3.4.3 The difference in distribution of heavy metal forms | 第58-60页 |
| 3.4.4 Vegetable safety and health risk | 第60页 |
| 3.5 Brief summary | 第60-63页 |
| Chapter 4 Cultivar selection with low metal uptake ability and the difference of metalspeciation in plants:a pot experiment | 第63-85页 |
| 4.1 Introduction | 第63-64页 |
| 4.2 Materials and methods | 第64-67页 |
| 4.2.1 Tested cultivars and soil preparation | 第64-66页 |
| 4.2.2 Experiment treatments | 第66-67页 |
| 4.2.3 Preparation and analysis of plant sample | 第67页 |
| 4.2.4 Statistical methods | 第67页 |
| 4.3 Results | 第67-78页 |
| 4.3.1 Growth status of tested cultivars | 第67-68页 |
| 4.3.2 Selection of cultivars with low metal uptake | 第68-71页 |
| 4.3.3 Heavy metal speciation in vegetables | 第71-75页 |
| 4.3.4 Accumulation factor | 第75-78页 |
| 4.4 Discussion | 第78-82页 |
| 4.4.1 Biomass responses of different vegetables to heavy metals | 第78页 |
| 4.4.2 Difference of heavy metal concentrations among cultivars | 第78-80页 |
| 4.4.3 The difference of metal speciation in plants | 第80-82页 |
| 4.4.4 Difference in AF and AFavail | 第82页 |
| 4.5 Brief summary | 第82-85页 |
| Chapter 5 The effect of amendment addition on heavy metal speciation in soil andplants | 第85-103页 |
| 5.1 Introduction | 第85-86页 |
| 5.2 Materials and Methods | 第86-88页 |
| 5.2.1 Tested plant and soil preparation | 第86页 |
| 5.2.2 Orthogonal experiment | 第86-88页 |
| 5.2.3 Plant sample preparation and analysis | 第88页 |
| 5.2.4 Statistical methods | 第88页 |
| 5.3 Results | 第88-97页 |
| 5.3.1 Growth status of tested cultivars | 第88-89页 |
| 5.3.2 As,Pb and Cd concentrations in pakchoi | 第89-92页 |
| 5.3.3 The quality of pakchoi | 第92-95页 |
| 5.3.4 Heavy metal speciation difference in different treatments | 第95-96页 |
| 5.3.5 The variation of metal bioavailability in soil | 第96-97页 |
| 5.4 Discussion | 第97-101页 |
| 5.4.1 Effects of soil amendments on growth and heavy metals contents of pakchoi | 第97-100页 |
| 5.4.2 Effect of heavy metals on crop quality | 第100页 |
| 5.4.3 Speciation difference in As and Cd | 第100-101页 |
| 5.5 Brief summary | 第101-103页 |
| Chapter 6 Conclusions and Suggestions | 第103-106页 |
| 6.1 Conclusions | 第103-105页 |
| 6.2 Suggestions | 第105-106页 |
| Acknowledgements | 第106-107页 |
| References | 第107-118页 |
| Appendix A List of published papers during my graduate study | 第118-119页 |
| Appendix B List of research programs participated in during my graduate study | 第119页 |
