文摘
英文文摘
表目录
图目录
Chapter 1 Advances in the impacts of agricultural management practices on soil quality/health
1.1. Soil quality/health and indicators
1.2. Effects of agricultural management practices on soil quality
1.2.1. Cultivation/tillage
1.2.2. Crop rotation
1.2.3. Inorganic and organic amendments
1.2.4. Pesticides
1.3. Microorganisms in soils
1.3.1. Significance of soil microorganisms
1.3.2. Impacts of agricultural practices on soil microorganisms
1.4. Enzymes activities in soils
1.4.1. Importance of soil enzymes
1.4.2. Impact of agricultural management practices on soil enzyme activities
1.5. Soil humic substances
1.5.1. Roles of Humic substances (HS)
1.5.2. Influence of agricultural practices on the composition and structure of HS
1.6. Research gaps, hypotheses, aims, and structure of the thesis
Chapter 2 Assessment of microbial activities in the long-term fertilization experimental soils
2.1. Site description, Experimental design and Basic soil properties
2.2. Statistical analyses
2.3. Microcalorimetric measurements of microbial activity
2.3.1. Introduction
2.3.2. Description of the method
2.3.3. Results
2.3.4. Discussion
2.3.5. Conclusions/recommendations
2.4. Determination of soil microbial biomass carbon and nitrogen
2.4.1. Introduction
2.4.2. Description ofthe method
2.4.3. Results and discussion
2.4.4. Conclusions and recommendations
2.5. Measurement of enzyme activities in soils
2.5.1. Introduction
2.5.2. Description of the methods
2.5.3. Results and Discussion
2.5.4. Conclusions and recommendations
Chapter 3 Characterization of soil microbial communities
3.1. Introduction
3.2. Description of the methods
3.2.1. Isolation and identification of total soil microorganisms
3.2.2. Isolation and identification of specific bacteria
3.2.3. Extraction of soil DNA
3.2.4. PCR-DGGE
3.3. Results and Discussion
3.4. Conclusions and recommendations
Chapter 4 Elemental and optical analyses of humic substances
4.1. Introduction
4.2. Materials and Methods
4.3. Results and Discussion
4.4. Conclusions
Chapter 5 Spectroscopic characteristics of humic substances in long-term fertilization experimental soils
5.1. FTIR-spectroscopy of humic substances
5.1.1. Introduction
5.1.2. Material and Methods
5.1.3. Results and Discussion
5.1.4. Conclusions
Chapter 6 Concluding remarks and Perspectives
References
ACKNOWLEDGEMENTS
LIST OF PUBLICATIONS
Appendix
