| 摘要 | 第6-7页 |
| abstract | 第7-8页 |
| LIST OF ABBRIVATIONS | 第16-17页 |
| CHAPTER1 -INTRODUCTION | 第17-23页 |
| 1.1 Effect of long-term inorganic fertilization on soil P fractions | 第18-19页 |
| 1.2 Effect of long-term organic fertilization on soil P-fractions | 第19-20页 |
| 1.3 Effect of tillage management on soil P fractions | 第20-22页 |
| 1.4 Scientific question | 第22页 |
| 1.5 Hypothesis | 第22页 |
| 1.6 Objectives | 第22-23页 |
| CHAPTER2 -MATERIALS AND METHODS | 第23-30页 |
| 2.1 Sites description | 第23页 |
| 2.2 Cropping practices and fertilization treatments | 第23页 |
| 2.3 Soil sampling and analysis | 第23-24页 |
| 2.4 Soil phosphorus fractions | 第24页 |
| 2.5 Sequential phosphorus fractionation method | 第24-27页 |
| 2.5.1 Equipment needed | 第24页 |
| 2.5.2 Soil Extraction | 第24-25页 |
| 2.5.3 Determination of inorganic P from NaHCO3,NaOH and HCl Extracts | 第25页 |
| 2.5.4 Determination of Total P from NaHCO3,NaOH and HCl Extracts | 第25-27页 |
| 2.6 Calculation of P efficiency indices | 第27页 |
| 2.7 Statistical analysis | 第27-30页 |
| CHAPTER3 -RESPONSES OF SOIL PHOSPHORUS FRACTIONS AND MOBILITY TO LONG TERM MINERAL FERTILIZATION UNDER DOUBLE RICE CROPPING SYSTEM IN FERRALIC CAMBISOL | 第30-41页 |
| Abstract | 第30页 |
| 3.1 Introduction | 第30-31页 |
| 3.2 Site description and experimental design | 第31页 |
| 3.3 Results | 第31-37页 |
| 3.3.1 Soil chemical properties | 第31页 |
| 3.3.2 Soil P fractions affected by long term NPK applications | 第31-33页 |
| 3.3.3 Relative proportions of P pools | 第33页 |
| 3.3.4 Relationship between soil chemical properties and P-fractions | 第33-35页 |
| 3.3.5 Grain yield,P uptake and P efficiency indices | 第35-36页 |
| 3.3.6 Soil nutrients response to P pools and P uptake by the crop | 第36-37页 |
| 3.4 Discussion | 第37-39页 |
| 3.4.1 Relationship of soil properties and P fractions with NPK additions | 第37-38页 |
| 3.4.2 Grain yield,P uptake and P efficiency indices | 第38-39页 |
| 3.4.3 Pathways of transformations in soil P pools and P uptake | 第39页 |
| 3.5 Conclusions | 第39-41页 |
| CHAPTER4 -CHANGES IN PHOSPHORUS FRACTIONS ASSOCIATED WITH SOIL CHEMICAL PROPERTIES UNDER LONG-TERM ORGANIC AND INORGANIC FERTILIZATION IN PADDY SOILS OF SOUTHERN CHINA | 第41-55页 |
| Abstract | 第41页 |
| 4.1 Introduction | 第41-42页 |
| 4.2 Sites description and experimental design | 第42-43页 |
| 4.3 Results | 第43-48页 |
| 4.3.1 Soil organic matter and pH | 第43页 |
| 4.3.2 Changes in soil P fertility | 第43-44页 |
| 4.3.3 Grain yield | 第44页 |
| 4.3.4 Soil P fractions | 第44页 |
| 4.3.5 P fractions affected by long-term inorganic and organic fertilizer applications | 第44-47页 |
| 4.3.6 The Relationship of P fractions with other soil properties | 第47页 |
| 4.3.7 Redundancy analysis(RDA)of the soil properties and different P fractions | 第47-48页 |
| 4.4 Discussion | 第48-54页 |
| 4.4.1 Soil P fractions and soil properties | 第48-49页 |
| 4.4.2 Fractional distribution of soil P | 第49-54页 |
| 4.5 Conclusions | 第54-55页 |
| CHAPTER5 -REPLACEMENT OF MINERAL FERTILIZERS WITH ORGANIC AMENDMENTS INCREASED THE RICE YIELD BY CHANGING PHOSPHORUS FRACTIONS IN A FLUVO-AQUIC SOIL | 第55-61页 |
| Abstract | 第55页 |
| 5.1 Introduction | 第55-56页 |
| 5.2 Site description and experimental design | 第56页 |
| 5.3 Results | 第56-59页 |
| 5.3.1 Grain yield,grain P uptake and P use efficiency indices | 第56-57页 |
| 5.3.2 Soil chemical properties | 第57页 |
| 5.3.3 Relative distribution of P fractions | 第57-59页 |
| 5.4 Discussion | 第59-60页 |
| 5.5 Conclusions | 第60-61页 |
| CHAPTER6 -ROLE OF SOIL MINERAL CONTENTS IN THE LABILITY OF PHOSPHORUS IN PURPLE PADDY SOILS UNDER LONG-TERM FERTILIZATION | 第61-68页 |
| Abstract | 第61页 |
| 6.1 Introduction | 第61-62页 |
| 6.2 Site description and experimental design | 第62页 |
| 6.3 Results | 第62-63页 |
| 6.3.1 Effect of long-term fertilization on soil properties | 第62-63页 |
| 6.3.2 Effect of long-term fertilization on phosphorus fractions and P uptake.. | 第63页 |
| 6.4 Discussion | 第63-67页 |
| 6.5 Conclusions | 第67-68页 |
| CHAPTER7 -PHOSPHORUS FRACTIONS,PHOSPHATASE ACTIVITIES AND CROP YIELD AFFECTED BY TILLAGE MANAGEMENT UNDER DIFFERENT PADDY SOILS | 第68-82页 |
| Abstract | 第68页 |
| 7.1 Introduction | 第68-69页 |
| 7.2 Site description and experimental design | 第69-70页 |
| 7.3 Results | 第70-78页 |
| 7.3.1 Soil organic matter and pH | 第70页 |
| 7.3.2 Changes in soil P concentrations | 第70-71页 |
| 7.3.3 Grain yield | 第71-72页 |
| 7.3.4 Soil P-fractionation | 第72页 |
| 7.3.5 P fractions affected by different tillage management | 第72页 |
| 7.3.6 The effect of tillage on the relative proportions of P-pools | 第72-74页 |
| 7.3.7 Soil phosphatase enzymes affected by tillage | 第74页 |
| 7.3.8 Redundancy analysis(RDA)of soil properties,phosphatase enzymes,grain yield and different P-fractions | 第74-76页 |
| 7.3.9 The contribution of soil properties and climatic factors to the grain yield by VPA | 第76-78页 |
| 7.4 Discussion | 第78-81页 |
| 7.4.1 Effect of tillage management on soil properties | 第78页 |
| 7.4.2 Impact of tillage systems on soil phosphatase enzyme | 第78-79页 |
| 7.4.3 Tillage management and the grain yield | 第79-80页 |
| 7.4.4 Labile and moderately labile phosphorus pool | 第80-81页 |
| 7.4.5 Non-labile phosphorous pool | 第81页 |
| 7.5 Conclusions | 第81-82页 |
| CHAPTER8 -CONCLUSIONS | 第82-84页 |
| 8.1 Research innovation | 第83页 |
| 8.2 Future research prospects | 第83-84页 |
| REFERENCES | 第84-97页 |
| ACKNOWLEDGEMENTS | 第97-98页 |
| CURRICULUM VITAE | 第98-100页 |
