| abstract | 第6-8页 |
| CHAPTER Ⅰ General Introduction | 第16-19页 |
| 1.1 Introduction | 第16-18页 |
| 1.2 Objectives | 第18-19页 |
| CHAPTER Ⅱ Review of Literature | 第19-37页 |
| 2.1 Long-term fertilization regimes effects on soil P status | 第19-23页 |
| 2.2 Long term fertilization affects on phosphorus accumulation and leaching | 第23-27页 |
| 2.3 Phosphorus status in China | 第27-29页 |
| 2.4 Land use change affect P accumulation and leaching | 第29-33页 |
| 2.4.1 Soil P accumulation | 第29-32页 |
| 2.4.2 P distribution depended on land-use changes | 第32-33页 |
| 2.5 Soil P saturation and leaching | 第33-36页 |
| 2.6 Research routes | 第36-37页 |
| CHAPTER Ⅲ Phosphorus efficiency, soil phosphorus dynamics and critical phosphorus level under long-term fertilization for single and double cropping systems | 第37-59页 |
| 3.1 Introduction | 第37-39页 |
| 3.2 Materials and Methods | 第39-42页 |
| 3.2.1 Study site & Experimental design | 第39-40页 |
| 3.2.2 Sampling and analysis | 第40-41页 |
| 3.2.3 Data processing | 第41-42页 |
| 3.2.4 Statistical analysis | 第42页 |
| 3.3 Results | 第42-53页 |
| 3.3.1 Crop yield and phosphorus uptake | 第42-44页 |
| 3.3.2 Phosphorus efficiency | 第44-45页 |
| 3.3.3 Phosphorus dynamics at topsoil layer | 第45-48页 |
| 3.3.4 Relationship among soil P parameters and between crop yield and soil Olsen P | 第48-50页 |
| 3.3.5 Distribution of soil total-P and Olsen-P in the soil profile | 第50-53页 |
| 3.4 Discussion | 第53-59页 |
| 3.4.1 Phosphorus efficiency | 第53-55页 |
| 3.4.2 The critical level of soil Olsen-P | 第55-56页 |
| 3.4.3 Relationships between soil P and P budget | 第56-57页 |
| 3.4.4 Phosphorus downward movement in the soil profile | 第57-59页 |
| CHAPTER Ⅳ Changes in phosphorus fractions under long-term fertilization for double cropping system | 第59-75页 |
| 4.1 Introduction | 第59-60页 |
| 4.2 Materials and Methods | 第60-64页 |
| 4.2.1 Study site & experimental design | 第60-61页 |
| 4.2.2 Sampling and analysis | 第61页 |
| 4.2.3 Phosphorus sequential fractionation | 第61-62页 |
| 4.2.4 Phosphate determination | 第62-63页 |
| 4.2.5 Data processing Statistical analysis | 第63-64页 |
| 4.3 Results | 第64-72页 |
| 4.3.1 Total, geochemical and biochemical phosphorus | 第64-66页 |
| 4.3.2 Phosphorus lability | 第66-71页 |
| 4.3.3 Soil organic carbon to phosphorus ratio | 第71-72页 |
| 4.4 Discussion | 第72-75页 |
| CHAPTER Ⅴ Land use changes impact accumulation and distribution of phosphorus in deep soil profile | 第75-92页 |
| 5.1 Introduction | 第75-76页 |
| 5.2Materials and Methods | 第76-79页 |
| 5.2.1 Study area and land uses | 第76-77页 |
| 5.2.2 Sampling and analysis | 第77-78页 |
| 5.2.3 Data processing and statistical analysis | 第78-79页 |
| 5.3 Results | 第79-87页 |
| 5.3.1 Organic and inorganic carbon | 第79-80页 |
| 5.3.2 Soil particles size distribution | 第80-81页 |
| 5.3.3 Soil P changes in soil profile after conversions from arable crop to greenhouse vegetable or kiwi-orchard | 第81-84页 |
| 5.3.4 Comparison of soil P between contrasting planting history under greenhouse vegetable | 第84-85页 |
| 5.3.5 Degree of phosphorus saturation | 第85-86页 |
| 5.3.6 Relationship between soil test P parameters and soil properties | 第86-87页 |
| 5.4 Discussion | 第87-92页 |
| 5.4.1 Phosphorus accumulation at surface layer | 第87-89页 |
| 5.4.2 Phosphorus movement in the soil profile | 第89-92页 |
| CHAPTER Ⅵ Phosphorus fractions affected by land-use changes in soil profile | 第92-109页 |
| 6.1 Introduction | 第92-93页 |
| 6.2 Materials and Methods | 第93-96页 |
| 6.2.1 Study area and land uses | 第93-94页 |
| 6.2.2 Soil sampling | 第94页 |
| 6.2.3 Phosphorus Fractions | 第94页 |
| 6.2.4 Bulk density and soil properties analysis | 第94-95页 |
| 6.2.5 Determination of the degree of phosphorus saturation | 第95页 |
| 6.2.6 Data processing and statistical analysis | 第95-96页 |
| 6.3 Results | 第96-104页 |
| 6.3.1 Easily available P | 第96-98页 |
| 6.3.2Moderately available P | 第98-99页 |
| 6.3.3 Non-available P | 第99-100页 |
| 6.3.4 Total phosphorus concentration and phosphorus stocks | 第100-101页 |
| 6.3.5 Soil organic carbon to phosphorus ratio | 第101-102页 |
| 6.3.6 Correlation between phosphorus fraction and soil properties | 第102-103页 |
| 6.3.7 Degree of phosphorus saturation | 第103-104页 |
| 6.4 Discussion | 第104-109页 |
| 6.4.1 Phosphorus status is influenced by land-use | 第104-105页 |
| 6.4.2 Effect of land-use change on the forms and distribution of soil P | 第105-109页 |
| CHAPTER Ⅶ General conclusions and perspectives | 第109-112页 |
| 7.1 General conclusions | 第109-110页 |
| 7.2 Future perspectives | 第110-112页 |
| References | 第112-128页 |
| Acknowledgements | 第128-130页 |
| BIOGRAPHICAL SKETCH | 第130页 |
