| 摘要 | 第6-7页 |
| Abstract | 第7-8页 |
| Abbreviation | 第11-14页 |
| CHAPTER1 :INTRODUCTION | 第14-27页 |
| 1.1 INTRODUCTION | 第14-16页 |
| 1.2 BACKGROUND | 第16-19页 |
| 1.2.1 Definition of conservation tillage | 第16页 |
| 1.2.2 History of conservation tillage | 第16-17页 |
| 1.2.3 Area under no tillage system around the world | 第17-18页 |
| 1.2.4 Benefit of conservation tillage | 第18-19页 |
| 1.3 EFFECTS OF CONSERVATION TILLAGE | 第19-25页 |
| 1.3.1 On soil water | 第19-20页 |
| 1.3.2 On soil temperature | 第20-21页 |
| 1.3.3 On soil respiration | 第21-23页 |
| 1.3.4 On soil carbon sequestration | 第23-24页 |
| 1.3.5 Crop yield | 第24-25页 |
| 1.4 CONSERVATION TILLAGE IN CHINA | 第25-26页 |
| 1.4.1 History of conservation tillage in China | 第25-26页 |
| 1.4.2 Problems encountered with inappropriate tillage system in North China | 第26页 |
| 1.5 PROBLEM STATEMENT AND RESEARCH OBJECTIVES | 第26-27页 |
| CHAPTER 2: MATERIALS AND METHOD | 第27-31页 |
| 2.1 DESCRIPTION OF EXPERIMENTAL SITE | 第27页 |
| 2.2 EXPERIMENTAL DESIGN AND TREATMENTS | 第27-28页 |
| 2.3 CROP MANAGEMENT | 第28页 |
| 2.4 MEASUREMENTS | 第28-30页 |
| 2.4.1 Soil carbon dioxide emission and soil temperature measurement | 第28-29页 |
| 2.4.2 Soil moisture and bulk density | 第29页 |
| 2.4.3 Soil organic carbon , total nitrogen and available phosphorus | 第29-30页 |
| 2.5 STATISTICAL ANALYSIS | 第30-31页 |
| CHAPTER 3 RESULTS AND DISCUSSION | 第31-50页 |
| 3.1 COMBINED EFFECTS TILLAGE AND CROP RESIDUES ON SOIL RESPIRATION, SOIL TEMPERATURE, ANDSOIL MOISTURE DURING WHEAT GROWING PERIOD | 第31-37页 |
| 3.1.1 Soil respiration rate and cumulative carbon dioxide emission during wheat growing period | 第31-32页 |
| 3.1.2 Soil temperature during wheat growing period | 第32-33页 |
| 3.1.3 Soil moisture during wheat growing period | 第33-35页 |
| 3.1.4 Relationship between soil respiration, and soil moisture and soil temperatureduring wheat growing period | 第35-37页 |
| 3.2 DISCUSSION | 第37-38页 |
| 3.3 COMBINED EFFECTS OF TILLAGE AND CROP RESIDUES ON SOIL RESPIRATION, SOIL TEMPERATURE, AND SOIL MOISTURE DURING MAIZE GROWING PERIOD | 第38-44页 |
| 3.3.1 Soil respiration rate and cumulative carbon dioxide emission during maize growing | 第38-40页 |
| 3.3.2 Soil temperature during maize growing period | 第40页 |
| 3.3.3 Soil water content during maize growing period | 第40-42页 |
| 3.3.4 Relationship between soil respiration, and soil moisture and soil temperature during maizegrowing period | 第42-44页 |
| 3.4 DISCUSSION | 第44-45页 |
| 3.5 COMBINED EFFECTS OF TILLAGE AND CROP RESIDUES ON SOIL PROPERTIES AND CROP YIELD | 第45-48页 |
| 3.5.1 soil properties | 第45-47页 |
| 3.5.2 crop yield | 第47-48页 |
| 3.6 DISCUSSION | 第48-50页 |
| CONCLUSION AND RECOMMENDATION | 第50-51页 |
| REFERENCES | 第51-63页 |
| ACKNOWLEDGEMENT | 第63-64页 |
| AUTHOR'S BIOGRAPHY | 第64-66页 |
