| 摘要 | 第1-6页 |
| Abstract | 第6-12页 |
| 1 Literature Review | 第12-18页 |
| ·Heavy metals and plants | 第12-13页 |
| ·Phytoremediation | 第13-14页 |
| ·Biological mechanisms of phytoextraction | 第14-15页 |
| ·Use of synthetic chelating agents for phytoextraction | 第15-17页 |
| ·Research objectives | 第17-18页 |
| 2 Uptake and Accumulation of Cadmium by Corn (Zea mays L.) at Different Cd Supply Levels | 第18-32页 |
| ·Introduction | 第18-19页 |
| ·Materials and methods | 第19-21页 |
| ·Plant culture | 第19-20页 |
| ·Plant samples and analysis of cadmium | 第20页 |
| ·Chlorophyll and carotenoid analyses | 第20-21页 |
| ·Proline analysis | 第21页 |
| ·Bioconcentration factor (BCF) and transportation index (T_i) | 第21页 |
| ·Data analysis | 第21页 |
| ·Results and analyses | 第21-29页 |
| ·Response of plant growth to different Cd supply levels | 第21-24页 |
| ·Cadmium concentration and accumulation at different Cd supply levels | 第24-25页 |
| ·Transportation index (T_i) and bioconcentration factor (BCF) | 第25-27页 |
| ·Contents of chlorophyll and carotenoid in corn at different Cd supply levels | 第27-28页 |
| ·Proline concentration in corn at different Cd supply levels | 第28-29页 |
| ·Discussion | 第29-32页 |
| 3 Uptake and Accumulation of Cadmium and Zinc by Corn (Zea mays L.) and at Different Cd/Zn Supply Levels | 第32-49页 |
| ·Introduction | 第32-33页 |
| ·Materials and methods | 第33-36页 |
| ·Plant culture | 第33-34页 |
| ·Plant samples | 第34页 |
| ·Bioconcentration factor (BCF), transportation index (T_i) and accumulation rate | 第34-35页 |
| ·Statistical analysis | 第35-36页 |
| ·Results and analyses | 第36-47页 |
| ·Effects of Cd/Zn complex levels on shoot and root growth of corn | 第36-37页 |
| ·Effects of Cd/Zn complex supply levels on Cd concentration in corn | 第37-39页 |
| ·Effects of Cd/Zn complex supply levels on Zn concentration in corn | 第39-40页 |
| ·Transportation index (T_i), bioconcentration factor (BCF) and total accumulation rate | 第40-41页 |
| ·Linear model regression analysis | 第41-44页 |
| ·Effects of Cd/Zn complex levels on Cd and Zn accumulation in shoots and roots of corn | 第44-47页 |
| ·Discussion | 第47-49页 |
| 4 Uptake and Accumulation of Cadmium, Zinc and Lead by soybean (Glycine max L.) at Different Cd, Cd/Zn and Cd/Pb Supply Levels | 第49-72页 |
| ·Introduction | 第49-51页 |
| ·Materials and methods | 第51-52页 |
| ·Plant culture | 第51页 |
| ·Plant samples | 第51-52页 |
| ·Statistical analysis | 第52页 |
| ·Results and analyses | 第52-69页 |
| ·Effects of Cd supply levels on shoot and root growth of soybean | 第52-53页 |
| ·Effects of Cd/Zn and Cd/Pb complex supply levels on shoot and root growth of soybean | 第53-54页 |
| ·Cadmium concentration in shoot and root of soybean at different Cd supply levels | 第54-56页 |
| ·Effects of Cd/Zn and Cd/Pb complex supply levels on Cd concentration in soybean | 第56-58页 |
| ·Effects of Cd/Zn and Cd/Pb complex supply levels on Zn and Pb concentration in soybean | 第58-59页 |
| ·Linear model regression analysis | 第59-65页 |
| ·Cadmium accumulation at different single Cd supply levels | 第65-66页 |
| ·Effects of Cd/Zn complex levels on Cd and Zn accumulation in shoots and roots of soybean | 第66-68页 |
| ·Effects of Cd/Pb complex levels on Cd and Pb accumulation in shoots and roots of soybean | 第68-69页 |
| ·Discussion | 第69-72页 |
| 5 Metal Accumulation and Competitive Ability in Corn and Soybean Fed with Different Zn Salts | 第72-85页 |
| ·Introduction | 第72-73页 |
| ·Materials and methods | 第73-75页 |
| ·Results and analyses | 第75-83页 |
| ·Shoot biomass of corn and soybean | 第75-77页 |
| ·Zn concentration in the shoots of corn and soybean | 第77-78页 |
| ·Zn concentration in different parts of soybean | 第78-79页 |
| ·Zn mass in shoot | 第79-80页 |
| ·Competitive interactions between corn and soybean in mixed culture | 第80-83页 |
| ·Discussion | 第83-85页 |
| ·Zn availability | 第83页 |
| ·Difference in Zn accumulation between corn and soybean | 第83-84页 |
| ·Zn tolerance | 第84页 |
| ·Interactions between com and soybean | 第84-85页 |
| 6 Chelate-induced Phytoextraction of Heavy Metals in Soybean (Glycine max L.) | 第85-96页 |
| ·Introduction | 第86-88页 |
| ·Materials and methods | 第88-90页 |
| ·Soil characterization | 第88页 |
| ·Plant material | 第88页 |
| ·Effects of different chelator treatments on plant growth and metal uptake | 第88-89页 |
| ·Desorption of metals from soil by chelates | 第89页 |
| ·Chemical analysis | 第89页 |
| ·Data analysis | 第89-90页 |
| ·Results and analyses | 第90-94页 |
| ·Effects of EDTA, TEA and citric acid on soybean growth | 第90-91页 |
| ·Effects of EDTA, TEA and citric acid on shoot and root metal concentrations and phytoextraction | 第91-94页 |
| ·Effects of EDTA, DTPA and citric acid on the solubility of metals in soil | 第94页 |
| ·Discussion | 第94-96页 |
| 7 Conclusions | 第96-99页 |
| Acknowledgments (致谢) | 第99-101页 |
| References (参考文献) | 第101-117页 |
| Attachment (附件) | 第117-123页 |
| Study photos (实验相关照片) | 第117-123页 |
| 研究生期间发表论文和参加主要科研活动 | 第123-124页 |
