| ABSTRACT | 第7-9页 |
| 摘要 | 第10-15页 |
| CHAPTER 1 Introduction to Research | 第15-30页 |
| 1.1 The purpose and significance of research | 第15-16页 |
| 1.2 The research review and background of the Loess Plateau | 第16-30页 |
| 1.2.1 Impact of soil physico-chemical properties in different land use | 第17-19页 |
| 1.2.2 Assessment of soil organic carbon in different land use | 第19-22页 |
| 1.2.3 Effect of land use on root characteristics | 第22-25页 |
| 1.2.4 Effect of soil physical properties on aggregate stability | 第25-26页 |
| 1.2.5 Effect of soil biological properties on infiltration rate | 第26-28页 |
| 1.2.6 The relationship between land-use/land-management practice | 第28页 |
| 1.2.7 The effect of soil basic properties on water characteristic curve | 第28-30页 |
| CHAPTER 2 Research Objective and Methodology | 第30-41页 |
| 2.1 Characteristic of research area | 第30-34页 |
| 2.1.1 Loess Plateau | 第30-31页 |
| 2.1.2 Changwu county | 第31-34页 |
| 2.2 Research objectives | 第34页 |
| 2.3 Material and methods | 第34-41页 |
| 2.3.1 Determination of soil physico-chemical properties in different land use | 第34-36页 |
| 2.3.2 Determination of soil aggregate feature in different land use | 第36-37页 |
| 2.3.3 Field experiments of soil Infiltration rate in different land use | 第37-38页 |
| 2.3.4 Analysis of soil water characteristic curve in different land use | 第38-39页 |
| 2.3.5 Determination of root biomass and root image in different land use | 第39-40页 |
| 2.3.6 Statistical analysis | 第40-41页 |
| CHAPTER 3 Assessment of Soil Organic Matter in Different Land Use | 第41-50页 |
| 3.1 Introduction to soil organic matter | 第41-42页 |
| 3.2 Results and Discussion | 第42-49页 |
| 3.2.1 Impact of Physicochemical properties in different land use | 第42-44页 |
| 3.2.2 Effect of soil organic matter in different land use | 第44-45页 |
| 3.2.3 Assessment of total nitrogen, organic carbon and C: N ratio in different land use | 第45-49页 |
| 3.3 Conclusion | 第49-50页 |
| CHAPTER 4 Assessment of Soil Aggregation in Different Land use | 第50-68页 |
| 4.1 Introduction to soil aggregate | 第50-51页 |
| 4.2 Results and discussion | 第51-67页 |
| 4.2.1 Effect of different size fraction of dry stable aggregate in different land use | 第51-55页 |
| 4.2.2 Effect of different size fraction of water stable aggregate in different land use | 第55-58页 |
| 4.2.3 DSA and WSA size fractions in different landuse | 第58-61页 |
| 4.2.4 Mean weight diameter and geometric mean diameter of DSA and WSA | 第61-66页 |
| 4.2.5 Importance of soil aggregate size fraction in different land use | 第66页 |
| 4.2.6 Pearson Correlation between soil aggregates and other related soil properties | 第66-67页 |
| 4.3 Conclusion | 第67-68页 |
| CHAPTER 5Assessment of Soil Hydraulic Properties in Different Land use | 第68-75页 |
| 5.1 Introduction to soil hydraulic properties | 第68-69页 |
| 5.2 Results and Discussion | 第69-74页 |
| 5.2.1 Effect of different land use on soil macropores | 第69-70页 |
| 5.2.2 Assessment of soil infiltration rate in different land use | 第70-74页 |
| 5.3 Conclusion | 第74-75页 |
| CHAPTER 6 Assessment of Water Characteristic Curve in Different Land use | 第75-85页 |
| 6.1 Introduction to soil water characteristic curve | 第75-77页 |
| 6.2 Results and Discussion | 第77-84页 |
| 6.2.1 Effect of different land use on soil water characteristic curves | 第77-78页 |
| 6.2.2 Comparison of soil water characteristic in different land use | 第78-84页 |
| 6.3 Conclusion | 第84-85页 |
| CHAPTER 7 Comparison of Roots in Different in Land use | 第85-90页 |
| 7.1 Introduction to root characteristic | 第85-87页 |
| 7.2 Results and Discussion | 第87-89页 |
| 7.2.1 Assessment of root biomass in different land use | 第87页 |
| 7.2.2 Assessment of different root parameters by using Ct scanning | 第87-89页 |
| 7.3 Conclusion | 第89-90页 |
| CHAPTER 8 Summary of the Research | 第90-95页 |
| 8.1 Main findings | 第90-92页 |
| 8.2 Innovative Points | 第92页 |
| 8.3 Some Problems | 第92-93页 |
| 8.3.1 Specific Problems caused by poor formation of soil aggregate | 第92页 |
| 8.3.2 Practices lead to poor soil aggregate stability | 第92-93页 |
| 8.4 Recommendations | 第93-95页 |
| APPENDIX | 第95-101页 |
| REFERENCE | 第101-116页 |
| ABOUT THE AUTHOR | 第116-117页 |
| ACKNOWLEDGEMENT | 第117-118页 |
| RESEARCHPUBLICATIONS | 第118页 |
