| 本研究由以下项目资助 | 第1-5页 |
| Abstract | 第5-7页 |
| 摘要 | 第7-8页 |
| Table of contents | 第8-10页 |
| Section 1: Introduction | 第10-23页 |
| ·Background | 第10-14页 |
| ·Grassland and microbial community | 第10页 |
| ·Role of soil microbes in grassland | 第10-12页 |
| ·Grassland and significance of microbial community | 第12-14页 |
| ·Perspectives in the researches | 第14-20页 |
| ·The influence of vegetation on microbial community | 第14-17页 |
| ·The influence of environment factors on microbial community | 第17-18页 |
| ·The influence of climate on microbial communities | 第18-19页 |
| ·Grazing and soil microbial community | 第19-20页 |
| ·Justification | 第20-21页 |
| ·Ultimate aim and scope of the study | 第21-23页 |
| Section 2: Materials and methods | 第23-30页 |
| ·Study sites | 第23-24页 |
| ·Experimental sites | 第24-25页 |
| ·Research methods | 第25-30页 |
| ·Experimental design | 第25页 |
| ·Sampling methods | 第25-26页 |
| ·Soil bacteria analysis | 第26-27页 |
| ·Environment factors analysis | 第27-29页 |
| ·Statistical analysis | 第29-30页 |
| Section 3: Results | 第30-39页 |
| ·Analysis of environment factor of research sites | 第30-35页 |
| ·Analysis of soil water content | 第30页 |
| ·Analysis of soil pH value | 第30-31页 |
| ·Analysis of soil electric conductivity | 第31-32页 |
| ·Analysis of soil organic carbon | 第32页 |
| ·Analysis of soil total nitrogen | 第32-33页 |
| ·Analysis of soil total phosphorus | 第33-34页 |
| ·Analysis of soil C : N ratio | 第34页 |
| ·Analysis of soil N : P ratio | 第34-35页 |
| ·DGGE profile of bacterial communities in rhizospheres of plants in Ewenke, Damao and Xilinhot | 第35-36页 |
| ·Relationship between soil bacterial richness and different soil environmental factors | 第36-39页 |
| Section 4: Discussion | 第39-41页 |
| Section 5: General conclusion | 第41-44页 |
| ·Main conclusion | 第41-42页 |
| ·Suggestions for further research and management implications | 第42-44页 |
| References | 第44-50页 |
| Acknowledgments | 第50页 |
