| SUMMARY | 第5-7页 |
| 摘要 | 第9-13页 |
| Chapter Ⅰ INTRODUCTION | 第13-21页 |
| 1.1 Research background and current situation | 第13-18页 |
| 1.1.1 Research Background | 第13-14页 |
| 1.1.2 Research progress | 第14-17页 |
| 1.1.3 Problems existing in the current study | 第17-18页 |
| 1.2 Research content | 第18页 |
| 1.3 Research purpose and significance | 第18-20页 |
| 1.3.1 Objective | 第18页 |
| 1.3.2 Significance | 第18-20页 |
| 1.4 Research Route | 第20-21页 |
| Chapter Ⅱ MATERIALS AND METHODS | 第21-27页 |
| 2.1 Overview of study area | 第21-22页 |
| 2.1.1 Geographic location | 第21-22页 |
| 2.1.2 Climatic characteristics | 第22页 |
| 2.1.3 Soil characteristics | 第22页 |
| 2.1.4 Vegetation survey | 第22页 |
| 2.2 Plots setting | 第22-24页 |
| 2.2.1 Site selection and plots design | 第22-23页 |
| 2.2.2 Basic situation and investigation on Chinese pine generation of sampling plots | 第23页 |
| 2.2.3 Chinese pine regeneration investigated | 第23-24页 |
| 2.2.4 Soil sampling | 第24页 |
| 2.3 Laboratory analysis | 第24-26页 |
| 2.3.1 Soil physio-chemical properties analyze | 第24-25页 |
| 2.3.2 Soil enzyme activity analyze | 第25页 |
| 2.3.3 Soil microbial biomass carbon and nitrogen analyze | 第25-26页 |
| 2.4 Data analysis | 第26-27页 |
| Chapter Ⅲ PHYSIO-CHEMICAL PROPERTIES ON TEMPORAL VARIATION ATDIFFERENT AGE OF CHINESE PINE | 第27-34页 |
| 3.1 Soil physical characteris on temporal variation in the different stages in Loess PlateauChina | 第28-29页 |
| 3.2 Soil chemical characteris on temporal variation in the different stages in LoessPlateau China | 第29-31页 |
| 3.2.1 Changes of soil chemistry properties of different developmental stages of Chinesepineon Loess Plateau | 第29页 |
| 3.2.2 Temporal variation on soil chemical properties | 第29-31页 |
| 3.3 The effect of forest ages and seasons to soil physio-chemical | 第31页 |
| 3.4 Correlation of soil physio-chemical properties of Chinese pine | 第31-32页 |
| 3.5 Discussion | 第32-34页 |
| Chapter Ⅳ SEASONAL VARIATION ON SOIL MICROBIAL AND ENZYMATICACTIVITIES | 第34-46页 |
| 4.1 Seasonal responding on soil microbiomes | 第35-36页 |
| 4.2 Seasonal responding on soil enzyme activities | 第36-37页 |
| 4.3 Correlation analysis among microbial biomass, soil properties, and enzyme activities | 第37-42页 |
| 4.4 Discussion | 第42-46页 |
| 4.4.1 Enzyme activities | 第42-43页 |
| 4.4.2 Soil Microbial biomass Carbon and Nitrogen | 第43-46页 |
| Chapter Ⅴ CHINESE PINE GENERATION CHARACTERISTIC | 第46-53页 |
| 5.1 Chinese pine regeneration on the Loess plateau | 第47页 |
| 5.2 Multivariate analysis of soil physical-chemical properties | 第47-49页 |
| 5.3 Multivariate analysis of soil microbial properties | 第49-51页 |
| 5.4 Discussion | 第51-53页 |
| Chapter Ⅵ CONCLUSIONS | 第53-54页 |
| REFERENCES | 第54-68页 |
| LIST OF ABBREVIATIONS | 第68-69页 |
| ACKNOWLEDGEMENTS | 第69-71页 |
| AUTHOR BIOGRAPHICAL SKETCH | 第71页 |
