声明
Acknowledgements
Abstract
摘要
Abbreviations
Table of Contents
List of Tables
1 General Introduction
1．1 Research Significance
1．2 Objectives and Thesis Format
2 Literature Review
2．1．1 Soil phosphorus forms
2．1．2 Soil phosphorus dynamics and transformations
2．1．3 Soil phosphoms mobility and transport loss pathways
2．2 Biogas slurry，Anionic polyacrylamide，and Gypsum
2．2．1 Biogas slurry production process
2．2．2 Physicochemical properties of biogas slurry
2．2．3 Influence of biogas slurry on soil nutrients transformations
2．3 Anionic polyacrylamide and Gypsum
3 Effect of biogas slurry application rate on colloidal phosphorus leaching in paddy soil：A column study
3．1 Introduction
3．2 Materials and methods
3．2．3 Column leaching study
3．2．4 Soil and Leachate Analysis
3．2．5 Statistical analysis
3．3 Results
3．3．2 Colloidal Fe，Al，Ca，and organic carbon in leachate
3．4．3 Effect of biogas slurry addition levels on phosphorus leaching
3．4．4 Prediction of colloidal phosphorus release in leachate
3．4 Discussion
3．4．2 Mechanisms involved in leaching of colloidal phosphorus
3．5 Conclusion
4 Effect of biogas slurry application on soil nutrients，phosphomonoesterase activities，and phosphorus species distribution
4．1 Introduction
4．2 Materials and Methods
4．2．1 Soil and Biogas slurry samples
4．2．2 Soil incubation
4．2．3 Soil physicochemical and phosphomonoesterase activities
4．2．4 Phosphorus-31 nuclear magnetic resonance analysis
4．2．5 Statistical analysis
4．3 Results
4．3．2 Effect of biogas slurry application on soil physicochemical properties
4．3．3 Effect of biogas slurry addition on soil phosphomonoesterase activities
4．3．4 Effect of biogas slurry addition on soil P species
4．3．5 Relationships between P species and soil phosphomonoesterase activities
4．4 Discussion
4．4．1 Effect of biogas slurry addition on soil nutrients
4．4．2 Impact of biogas slurry on phosphomonoesterase activities
4．4．3 Impact of biogas slurry on P species
4．5 Conclusion
5 Synergistic effects of anionic polyacrylamide and gypsum to control phosphorus losses from biogas slurry applied soils
5．1 Introduction
5．2 Materials and methods
5．2．1 Soils，biogas slurry，anionic polyacrylanlide samples
5．2．2 Batch experiment
5．2．3 Soil and soil solution analysis
5．2．4 Statistical analysis
5．3 Results
5．3．1 Initial soils and biogas slurry properties
5．3．2 Soil solution composition and pH
5．4．3 Phosphorus concentrations and forms in the soil solution
5．3．4 Prediction of phosphorus losses in the soil solution over different treatments
5．4 Discussion
5．4．3 Comparison of P losses from different soil types under different treatments
5．4．4 Mechanism of the release of phosphoms under different treatments
5．5 Conchsion
6 General Conclusion，Implications and Future research
6．1 General Conclusion
6．2 Implications
6．3 Future research
References
Publications
浙江大学;
